SECTION_26_0914_-_Dewatering_Pit_Pump_Control_System.doc

SECTION 26 0914

DEWATERING PIT PUMP CONTROL SYSTEM

PART 1 GENERAL

1.1 SUMMARY OF WORK

A. Under this section the contractor shall supple two (2) Dewatering Pit Pump Control Panels (DPCP) to replace two (2) existing Dewatering Pit Pump Controllers, one located at Eisenhower Lock and one located at Snell Lock. Each DPCP shall be provided with a remote Operator Interface for system monitoring and control from the respective dewatering pit.

B. The DPCP shall control the operation of the three existing dewatering pumps as specified herein.

C. Contractor supplied Submersible Level Transmitters shall transmit dewatering pit water levels to the DPCP.

D. The three existing dewatering pumps are as follows:

1. Pump #1 – 100HP

2. Pump#2 – 100HP

3. Pump #3 - 10HP (Currently being replaced with 40HP by SLSDC)

1.2 BASIS OF DESIGN

A. The basis of design for the Dewatering Pit Pump Control Panel specified herein is, systems manufactured by AquaLogics Systems, Inc., 5 Dwight Park Drive, Syracuse, NY 13209, Phone: (315) 413-0400 or approved equal.

1.3 SUBMITTALS

A. The system integrator shall for review, provide three (3) sets of the following documentation:

1. Written Sequence of Control System Operation

2. Electrical and Mechanical Schematic Drawings

3. Bill of Materials

4. Vendor Data Sheets

5. Control System Warranty (see below).

B. The system integrator shall submit for review Operator Interface Unit (OIU) operation and trend screens for review and approval. The system integrator shall, at no cost to SLSDC, reconfigure screens as per SLSDC request and then resubmit for approval.

C. Refer to specification 26 0100 – Special Conditions for lead time requirements for delivery of DPCP. Refer to contract substantial and completion date for contract requirements.

1.4 OPERATIONS AND MAINTENANCE DOCUMENTATION

A. The system integrator shall provide four (4) sets of the following Operations and Maintenance documentation; all documentation shall be neatly bound in 3-ring binders.

1. Final Written Sequence of Control System Operation

2. As-Installed Electrical and Mechanical Schematic Drawings

3. Bill of Materials

4. Vendor Operation, Maintenance and troubleshooting documentation

5. PLC and OIU program printouts

6. Back-up Copies of As-installed PLC and OIU programs on CD

1.5 WARRANTY

A. The system Integrator shall provide with the above submittals, a written parts and labor warranty against system failure for twelve (12) months from system startup, not to exceed eighteen (18) months from date of shipment from their factory. This warranty period will, with the exception of human negligence or acts of nature such as lightning, floods, wind etc., provide for repair of any and all defects of workmanship, as well as repair or replacement of any defective or failed components, at the project site, and at no cost to others.

1.6 QUALITY ASSURANCE

A. The Equipment, controls and accessories covered in this specification section constitute a completely integrated system, designed, constructed, programmed and tested by one Systems Integrator, accountable for its operation and performance. The Systems Integrator named hereafter has been chosen as the basis of design based their ability to engineer, design and manufacture systems of the type herein specified. In addition, they possess a factory trained, service staff experienced in routine and emergency service of the type of equipment herein specified.

B. The Contractor shall submit to the Engineer the name of the System Integrator to whom they propose to award the work. No Systems Integrator will be approved by the Engineer who cannot furnish satisfactory proof of at least ten (10) successful installations which in the judgment of the Engineer are of equal or greater complexity to that described herein.

C. The Systems Integrator shall be a reputable firm that has been in the business of providing automated control systems specifically for the water and wastewater treatment industry for a minimum of five (5) years. Systems Integrators with less than five (5) years of experience will not be accepted.

D. The Systems Integrator shall have as a minimum, five (5) full time employees whom are experience in routine and emergency services of the equipment herein specified. The Systems Integrator shall as a minimum provide two (2) direct cell phone numbers in which service personnel can be reached 24hrs, 7 days a week.

E. The System Integrator shall be U.L. approved for manufacturing systems in compliance with UL 508A and/or UL 698A whichever may be applicable. Each assembly and subassembly of the system shall be listed and labeled as U.L. approved. Systems Integrators whom outsource panel fabrication services for the purpose of providing UL labeling will not be accepted.

F. The Systems Integrator shall be AquaLogics Systems, Inc., 5 Dwight Park Drive, Syracuse, NY 13209, Phone:( 315) 413-0400 or approved equal.

G. Control panels shall be fabricated with the following features as a minimum:

1. All sub panel wiring shall be run in plastic wire duct sized with 50% spare space, AC and DC wiring shall be run in separate wire ducts.

2. All power supplies shall be sized for an additional 50% spare ampacity over expected load. Each power supply shall include an AC input fuse and independent output fuses for each device requiring DC power.

3. All field terminations shall be made on compression type terminal blocks labeled according to wire number, separate terminal strips shall be provided for AC and DC signals. A minimum of 20% spare terminals shall be provided.

4. Wiring to door mounted components shall be neatly bundled wiring harnesses protected by plastic spiral wire wrap when crossing door hinge. Wiring harnesses shall have adequate stress loops and be fastened at both sides of hinge crossing.

5. All wiring shall be wire numbered at both ends with plastic Brady type labels.

6. All nameplates shall be engraved on lamacoid material providing black lettering on a white background. Lettering shall be no smaller than 1/8 of an inch in height.

7. Twenty percent spare mounting space is required for future modifications.

1.7 DESCRIPTION OF OPERATION

A. The Systems Integrator shall provide for contractor installation a completely integrated dewatering pump control system, consisting of a Dewatering Pump Control Panel (DPCP), wetwell level transmitter, and accessories. Two (2) complete systems shall be provided, one (1) for the Snell lock and one (1) for the Eisenhower lock. Each dewatering pump control system shall be provided as herein specified.

B. The DPCP shall be PLC based completely factory programmed as required to provide the follow control strategies. A door mounted color touch screen Operator Interface Unit (OIU) shall be provided for system monitoring and control. Pre-packaged, configurable controllers limiting system functionality and future expandability are not acceptable.

1. Dewatering Pit Level Monitoring:

a. A submersible level transmitter shall be provided for installation within the dewatering pit at each location. The transmitter shall be of the two-wire type powered by the DPCP, and shall provide a 4-20 mAdc signal linear and proportional to water level within the respective dewatering pit. The DPCP shall utilize this signal for control, monitoring, trending and alarm functions.

b. The submersible level transmitter shall be provided with a stainless steel suspension kit which shall allow for removal of the level transmitter without having to enter the dewatering pit.

c. The DPCP shall provide an independent 4-20 mAdc dewatering pit level output signal for remote indication of dewatering pit level. The contractor shall wire the signal to the existing remote level indicator.

d. Dewatering Pit is approximately 50 feet to 60 feet deep.

2. Dewatering Pit Level Control:

a. Pump #3 shall always be the lead pump, unless unavailable as described later in this section. Pumps #1 and #2 shall be the Lag Pumps. As level in the dewatering pit rises above an adjustable “Lead Pump ON” setpoint, system logic shall start the lead pump by use of an existing motor starter located in the MCC. The lead pump shall continue to run until the dewatering pit level falls below the “Lead Pump Off” setpoint.

b. Should incoming flow exceed the capacity of the lead pump and the dewatering pit level continues to rise above the “Lag Pump On” setpoint, system logic shall automatically start the lag pump by use of an existing motor starter located in the MCC. Both the lead and lag pumps shall continue to run until the dewatering pit level falls below the “The Pumps Off” setpoint. Note that the lead and lag pumps shall have different off setpoints. The following adjustable setpoints shall be available through the touch screen; Lead Pump – on/off, Lag Pump #1 on/off, Lag Pump #2 on/off.

c. Should the lead and lag pumps be unable maintain water level and the dewatering pit continues to rise above the “Second Lag Pump On” setpoint, system logic shall automatically start the second lag pump by use of an existing motor starter located in the MCC. All three pumps shall continue to run until the dewatering pit level falls below the “Pumps Off” setpoint.

d. High Water Level Alarm, High Water Level Warning and Low Water Level alarm setpoints shall be provided for alarm annunciation of an abnormally high or low wetwell level condition.

e. All level control, alarm and time delay setpoints shall be fully adjustable via the DPCP door mounted OIU.

f. A disable pump adjustable set point shall be provided for all three pumps.

3. Hand-Off-Auto Pump Operation

a. Each pump’s operational mode shall be provided by a panel mounted Hand-Off-Auto selector switch, each mode shall operate as follows:

i) Hand: When “Hand” mode is selected the respective pump shall start regardless of system logic, all pump interlock conditions shall be overridden in the “Hand” mode.

ii) Off: When in “Off” mode the respective pump shall be prohibited from operation, system logic shall consider the pump unavailable for operation.

iii) Auto: When “Auto” mode is selected the respective pump shall operate as required by system logic and as described above; all pump safety interlocks shall be fully operational.

4. Pump Alternation and Sequence Selection

a. Pump Alternation and sequence selection (3-1-2/3-2-1/Auto) shall be provided by the DPCP door mounted operator Interface Unit (OIU).

i) Selection 3-1-2: Pump 3 remains lead, pump 1 remains lag and pump 2 remains second lag on each pump down cycle, alternation of pump(s) only occurs in the event of the lead pump not being available for operation.

ii) Selection 3-2-1: Pump 3 remains lead, pump 2 remains lag and pump 1 remains second lag on each pump down cycle, alternation of pump(s) only occurs in the event of the lead pump not being available for operation.

iii) Selection Auto: Pump 3 remains Lead Pump. Pumps 2 and 3 determined by system logic, alternation between pumps 2 and 3 on each pump down cycle or upon the lead pump not being available for operation.

5. Pump Availability:

a. A pump shall be considered unavailable for operation when any of the following conditions occur:

i) Respective pump mode of operation selector switch is in the “OFF” position

ii) Respective pump fails to start

iii) Respective pump emergency stop pushbutton is activated

iv) Dewatering pit low-level condition

6. Alarm Monitoring:

a. All level alarms shall be locally annunciated on the DPCP door mounted OIU, common alarm light and alarm horn. Alarm acknowledgement, reset and horn silence of system alarms shall be provided by a DPCP door mounted pushbutton

b. At a minimum the following conditions shall annunciate an alarm: Loss of Control Power, Pump Fail to start, e-stop active, High Water Level Alarm, High Water Level Warning.

c. For a High-Water Level Alarm, High Water Level Warning and Loss of Control Power a separate alarm relay output shall be provided for remote annunciation of system alarms.

7. Remote Level Monitoring:

a. The DPCP shall have two 4-20ma outputs for remote monitoring of Dewatering Pit Water Level. One output shall tie-in to SLSDC existing Schneider Electric analog input card and one output shall tie-in to future SLSDC provided device.

PART 2 PRODUCTS

2.1 DEWATERING PUMP CONTROL PANEL (DPCP)

A. The DPCP shall be housed in a wall-mount NEMA 4X, enclosure constructed of 316L stainless steel. The enclosure shall be approximately 36" high by 36" wide by 12" deep. The enclosure shall be Hoffman model CSD363612SS6R or approved equal.

B. Panel Input power shall be 120VAC, 1 Phase, 60Hz.

C. A 120VAC single phase surge protector shall be provided for the incoming 120VAC supply. The surge protector shall be designed to protect electrical and electronic equipment against transients caused by lightning, induction, load switching, EMP and other sources. Line to neutral, line to ground and neutral to ground protection shall be provided. The surge protector shall have a protection level of 1kV and a maximum discharge current of 140 kA as a minimum. The surge protector shall have a remote signaling device for fault indication to the PLC. The AC surge protector shall be CITEL model DS72RS-120 or approved equal.

D. Short circuit protection of 120VAC control power shall be provided by a miniature branch rated circuit breaker with an interruptive capacity of 10K amperes at 240VAC.

E. The DPCP shall be provided with an Uninterruptible Power Supply (UPS) for protection against power disturbances, noise and brownouts. The UPS shall as a minimum, include the following features:

1. AC Input Parameters

a. Surge Protection: 570J

b. Voltage Range: 84VAC - 140VAC (+/- 10VAC)

c. Frequency Range: 55-64 Hz. (+/- .1 Hz)

d. Input Power Cord: 6 ft. attached, w/NEMA 5-15 P

2. AC Output Parameters

a. Output Receptacles: Battery backup and surge protected Six (6) NEMA 5-15R, Surge protected only Two (2) NEMA 5-15R

b. Voltage Normal Mode: Nominal (110, 120, 127VAC) +/-10%

c. Voltage Battery Mode: 120VAC +/- 8%

d. Output: 1000VA, 8.3A

e. Battery Mode Waveform: Stepped Sinewave

f. Frequency: 50/ 60 Hz

3. Data Line

a. RJ11 (1 in/1 out), surge protected

4. Battery Parameters

a. Battery Type: Valve-regulated, non-spillable, lead acid

b. Battery Quantity: One (1), user replaceable

c. Transfer Time: 4 - 6 ms.

d. Back-up Time: Full Load 6 minutes, half Load 13 minutes

e. Recharge Time: 6 to 8 hours to 90% at rated capacity, after full discharge into resistive load.

5. The Uninterruptible Power Supply shall be Liebert, APC or approved equal.

F. The DPCP shall be provided with a Programmable Logic Controller (PLC). The PLC shall be factory programmed, tested and debugged to meet all application requirements. The PLC shall as a minimum, include the following features:

1. Input Power

a. 24VDC

2. User Program / User Data Space

a. 10 Kbytes / 10 Kbytes

3. Memory Storage

a. Non-volatile battery backed RAM

b. Back-up Memory Module

4. Data Logging / Recipe Storage

a. Up to 128 Kbytes for data logging and up to 64 Kbytes for recipe (recipe memory subtracted from available data logging)

5. Online Editing

a. The PLC shall be capable of allowing online editing to the application program without interruption. PLCs that require stopping the processor to download changes are not acceptable

6. I/O Local to PLC Base Unit

a. Digital Inputs

i) Eight (8) 24VDC

ii) Twelve (12) Fast 24VDC

b. Digital Outputs

i) Six (6) Relay

ii) Three (3) 24VDC FET

iii) Three (3) Fast, 24VDC FET

c. Analog Inputs

i) Four (4) 0-10VDC, 12 Bit

d. Analog Outputs

i) Two (2) 0-10VDC, 12 Bit

7. I/O Expansion

a. By use of up to seven (7) 1762 I/O modules (analog, digital, RTD or thermocouple)

b. Provide all I/O modules to meet site specific I/O requirements, plus 10% spare I/O points of each type used

8. Serial Ports

a. One RS-232 / RS-485 Combo Port

9. Serial Protocols

a. DF1 Full Duplex

b. DF1 Half Duplex Master/Slave

c. DF1 Radio Modem

d. DH-485

e. Modbus RTU Master/Slave

f. ASCII

10. Ethernet Ports

a. One 10/100 Mbps port

11. Ethernet Protocols

a. Ethernet/IP messaging

12. Real Time Clock

a. Embedded

13. PID Control Loops

a. Multiple loops limited only by program and stack memory

14. The PLC shall be capable of executing floating point math

15. The PLC shall have an integral LCD display for monitoring controller data

16. The Programmable Logic Controller (PLC) shall be Allen-Bradley MicroLogix 1400 model 1766-L32BXBBA with 1762 I/O modules or approved equal.

G. A door mounted Operator Interface Unit (OIU) shall be provided for system monitoring, setpoint entry/review and alarm annunciation. Communications between the OIU and PLC shall be Ethernet. The OIU shall be color touchscreen and as a minimum, include the following features:

1. Display:

a. Size: 6.5”

b. Resolution: 640 x 480, 18-bit color graphics

c. Touch Screen: analog resistive

2. Operating System:

a. Microsoft Windows CE with extended Features and MS Office Viewers

3. System Memory:

a. 512 MB RAM, 512 MB nonvolatile

4. External Storage:

a. Secure Digital (SD) card, cat. no.1784-SDx

5. Battery (Real-Time Clock)

a. Battery-backed time clock timestamps critical data. Accuracy +/-2 minutes per month

6. Environmental Operating Temperature:

a. 0 - 55°C (32 - 131°F)

7. Ratings

a. NEMA 12, 13, 4X, IP 66 as classified by UL

8. USB Ports:

a. Two USB high-speed 2.0 host ports (type A) support removable flash drives for external storage

9. Ethernet Ports:

a. Two 10/100Base-T, Auto MDI/MDI-X Ethernet Ports that support Device Level Ring (DLR), linear or star network topologies

10. Input Power

a. 18-30V DC (24VDC nominal)

11. The OIU shall be Factory programmed with the following screens:

a. Overview screen: Indicates current operational status of pump control system.

b. Dewatering Pit Level Control Screen: Indicates current dewatering pit level and provides access to level control and alarm setpoints.

c. Trending Screens: Provide historical trending screen for wetwell level and pump on/off operation.

d. Active Alarm Screen: Annunciates all currently active system alarms.

e. Historical Alarm Screen: Annunciates all past historical system alarms, provides date and time stamp as to when each alarm was initiated and acknowledge.

f. System Help Screen: Provides general instruction on OIU operation, navigation and setpoint entry.

12. The Operator Interface Unit (OIU) shall be Allen-Bradley PanelView Plus 7 model 2711P-T7C22D9P or approved equal.

H. The DPCP shall be provided with an industrial Ethernet switch for network communications between the PLC and OIU. Additional Ethernet ports shall be available for system programming and connectivity to future Local Area Network (LAN). The switch shall have the following features as a minimum:

1. Full IEEE 802.3 Compliance

2. Four 10/100BaseTX RJ-45 Ports

3. Unmanaged Operation

4. Extended Environmental Specifications

a. -40º to 80ºC Operating Temperature

b. >2M Hours MTBF

5. Supports Full/Half Duplex Operation

6. Up to 800 Mb/s Maximum Throughput

7. MDIX Auto Sensing Cable

8. Auto Sensing Speed and Flow Control

9. Full Wire Speed Communications

10. ESD Protection Diodes on RJ-45 Ports

11. Surge Protection Diodes on Power Inputs

12. Store-and-forward Technology

13. Redundant Power Inputs (10-30 VDC)

14. LED Link/Activity Status Indication

15. Hardened Metal DIN-Rail Enclosure

16. The Ethernet switch shall be N-TRON model 104TX or approved equal.

I. The DPCP shall be provided with a door mounted 30mm, three position Hand-Off-Auto mode of operation selector switch for each pump. Selector switches shall be Allen-Bradley 800H series or approved equal.

J. The DPCP shall be provided with door mounted Elapsed Time Meters (ETMs) for accumulating each of the pump’s operating runtime. The ETMs shall have a six-digit counter indicating accumulated runtime to 1/10th of an hour.

K. The DPCP shall provide visual alarm annunciation via common alarm pilot light and OIU alarm screen. Pilot light shall be 30mm, industrial grade, push-to-test type

L. The DPCP shall provide audible alarm annunciation via alarm horn. Alarm horn shall provide a typical sound pressure of 95 + 5 dB(A) at 30VDC, at 24 inches and shall have a built-in volume control providing variable attenuation up to 20 dB(A).

M. A momentary pushbutton shall be provided for alarm acknowledgment/reset and alarm horn silence, pushbutton shall 30 mm, Allen-Bradley 800H series or approved equal.

N. The DPCP shall be provided with a 24VDC analog signal surge protector for the wetwell level transmitter input signal. The surge protector shall be provided as part of the level transmitter’s lifetime surge protection warranty.

O. The DPCP shall be provided with an aneroid bellows for terminating the dewatering pit level transmitter vent tube, protecting the transmitter from damage due to moisture.

P. DC power supply: a 24V direct current power supply shall be provided to power the PLC, I/O, OIU and level transmitter. The power supply shall have an operational input range of 85 to 132VAC and shall have a minimum rated output of 24 to 28VDC/240 watts.

Q. AC power fuses shall be provided as required for over current protection of individual AC powered panel components. Single circuit fusible terminal blocks with neon blown fuse indicators suitable for use with ¼” x 1 ¼” glass fuses shall be provided for each circuit requiring fuse protection. Fusible terminal strips shall have a working voltage rating of 100 to 300VAC, and have a current rating of 12 Amps

R. DC power fuses shall be provided as required for over current protection of individual DC powered panel components. Single circuit fusible terminal blocks with LED blown fuse indicators suitable for use with ¼” x 1 ¼” glass fuses shall be provided for each circuit requiring fuse protection. Fusible terminal strips shall have a working voltage rating of 10 to 57V AC/DC, and have a current rating of 12 Amps

S. Interposing and control relays shall be provided as required. They shall be of industrial grade, plug-in socket type, and shall have 24VDC or 120VAC coils and 2PDT or 4PDT form C relays as required. All relay contacts shall be silver nickel plated, 2PDT relay contacts shall be rated for 10A at 300VAC and 4PDT relay contacts shall be rated for 7A at 300VAC. All relays shall be provided with a standard ON/OFF flag indicator, mounting base and retainer clip.

T. Compression type terminal blocks shall be provided for all field connections, wiring field equipment directly to PLC I/O bases or other panel components is not acceptable. Terminal blocks shall have the following electrical ratings as a minimum:

1. Two Level Terminal Blocks

a. Rated Voltage: 300V AC/DC

b. Rated Current: 20 Amp

c. Wire Size Range: 30-12 AWG

2. Three Level Terminal Blocks

a. Rated Voltage: 300V AC/DC

b. Rated Current: 10 Amp

c. Wire Size Range: 26-14 AWG

2.2 DEWATERING PUMP CONTROL PANEL (DPCP) REMOTE OPERATOR INTERFACE

A. The DPCP remote operator interface shall be housed in a wall-mount NEMA 4X, enclosure constructed of 316L stainless steel. The enclosure shall be approximately 20" high by 20" wide by 8" deep. The enclosure shall be Hoffman model CSD363612SS6R or approved equal.

B. Panel Input power shall be 120VAC, 1 Phase, 60Hz.

C. A 120VAC single phase surge protector shall be provided for the incoming 120VAC supply. The surge protector shall be designed to protect electrical and electronic equipment against transients caused by lightning, induction, load switching, EMP and other sources. Line to neutral, line to ground and neutral to ground protection shall be provided. The surge protector shall have a protection level of 1kV and a maximum discharge current of 140 kA as a minimum. The surge protector shall have a remote signaling device for fault indication to the PLC. The AC surge protector shall be CITEL model DS72RS-120 or approved equal.

D. Short circuit protection of 120VAC control power shall be provided by a miniature branch rated circuit breaker with an interruptive capacity of 10K amperes at 240VAC.

E. A door mounted Operator Interface Unit (OIU) shall be provided for system monitoring, setpoint entry/review and alarm annunciation. Communications between the OIU and the DPCP PLC shall be Ethernet. The OIU shall be programmed identical to the DPCP OIU and allow for complete system control, monitoring and alarming. The OIU shall be a color touchscreen and as a minimum, include the following features:

1. Display:

a. Size: 6.5”

b. Resolution: 640 x 480, 18-bit color graphics

c. Touch Screen: analog resistive

2. Operating System:

a. Microsoft Windows CE with extended Features and MS Office Viewers

3. System Memory:

a. 512 MB RAM, 512 MB nonvolatile

4. External Storage:

a. Secure Digital (SD) card, cat. no.1784-SDx

5. Battery (Real-Time Clock)

a. Battery-backed time clock timestamps critical data. Accuracy +/-2 minutes per month

6. Environmental Operating Temperature:

a. 0 - 55°C (32 - 131°F)

7. Ratings

a. NEMA 12, 13, 4X, IP 66 as classified by UL

8. USB Ports:

a. Two USB high-speed 2.0 host ports (type A) support removable flash drives for external storage

9. Ethernet Ports:

a. Two 10/100Base-T, Auto MDI/MDI-X Ethernet Ports that support Device Level Ring (DLR), linear or star network topologies

10. Input Power

a. 100-240VAC

11. The OIU shall be Factory programmed with the following screens:

a. Overview screen: Indicates current operational status of pump control system.

b. Dewatering Pit Level Control Screen: Indicates current dewatering pit level and provides access to level control and alarm setpoints.

c. Trending Screens: Provide historical trending screen for wetwell level and pump on/off operation.

d. Active Alarm Screen: Annunciates all currently active system alarms.

e. Historical Alarm Screen: Annunciates all past historical system alarms, provides date and time stamp as to when each alarm was initiated and acknowledge.

f. System Help Screen: Provides general instruction on OIU operation, navigation and setpoint entry.

12. The Operator Interface Unit (OIU) shall be Allen-Bradley PanelView Plus 7 model 2711P-T7C22DA9P or approved equal.

F. AC power fuses shall be provided as required for over current protection of individual AC powered panel components. Single circuit fusible terminal blocks with neon blown fuse indicators suitable for use with ¼” x 1 ¼” glass fuses shall be provided for each circuit requiring fuse protection. Fusible terminal strips shall have a working voltage rating of 100 to 300VAC, and have a current rating of 12 Amps

G. Compression type terminal blocks shall be provided for incoming power connections. Terminal blocks shall have the following electrical ratings as a minimum:

1. Two Level Terminal Blocks

a. Rated Voltage: 300V AC/DC

b. Rated Current: 20 Amp

c. Wire Size Range: 30-12 AWG

2.3 DEWATERING PIT SUBMERSIBLE LEVEL TRANSMITTER

A. Contractor to supply two (2) transmitters as specified herein. One shall be turned over to SLSDC as a spare.

B. The transmitter shall be non-fouling design incorporate a 4.10” PTFE isolated diaphragm with a 2.75” sensing area fitted to a rugged 316 stainless steel case.

C. The sensor shall utilize a silicon pressure cells fitted into the case with an integral, compliant stainless steel barrier diaphragm and have a .25% static accuracy.

D. The transmitter shall be 2-wire (22 AWG) design and produce a 4-20 mAdc signal linear to wetwell level. The conductors shall be encased in a polyurethane jacketed shielded cable with a polyethylene vent tube and Kevlar tension members. The cable shall have a 200 lbs. pull strength and be of sufficient length to reach the pump control panel in a continuous run without splices.

E. The transmitter shall have a ½” MNPT conduit fitting to provide for mounting the transducer to a conduit or suspension kit.

F. The transmitter range shall be suitable for the operating range of the wetwell plus any potential high water condition without any damage to the transducer.

G. The transmitter shall carry a lifetime surge protection warranty which shall include a din rail mount 24VDC surge protector for installation in the pump control panel.

H. The level transmitter shall be provided with an aneroid bellows for transmitter vent tube termination. The bellows shall be mounted in the dewatering pump control panel

I. The level transmitter shall be provided with a weighted suspension kit consisting of a 1” stainless steel pipe (a minimum of 60 feet long) which shall be attached to the transmitter conduit fitting. The suspension kit shall be provided with 60’ of 1/8” stainless steel cable and clamps to facilitate suspending the transmitter into the wetwell, while allowing it to be easily removed for service without entry into the wetwell.

J. The level transmitter shall be TE Connectivity/Measurement Specialties model 750 or approved equal.

PART 3 EXECUTION

3.1 INSTALLATION

A. The contractor Install equipment at locations indicated on the drawings.

B. The contractor shall provide all necessary cable, conduits, and fittings as required. All wiring shall be in conduit as shown on the contract drawings.

3.2 TECHNICAL SERVICE

A. The system integrator shall provide the services of a qualified service technician/engineer to perform the following service duties. The technician/engineer shall be a direct employee of the systems integrator; second party service relationships are not acceptable.

B. Field services as required to start-up and commission dewatering pump control system, one (1) eight (8) hour day at each location shall be provided as a minimum.

C. Field services to provide instruction to facility personnel, in the operation, proper maintenance, trouble shooting and repair of the equipment, one (1) four (4) hour session shall be provided as a minimum.

END OF SECTION

26 0914-2