B08_Attachment_1_Salient_Characteristics_CERC_Sondes.docx

140G0121Q0159 Salient Characteristics for a Brand Name or Equal CERC Multiparameter Water Quality Sondes The Columbia Environmental Research Center (CERC) located at 4200 New Haven Road, Columbia, Missouri 65201 requires new multiparameter water quality sondes to supplement its fleet of sondes.

We will require 3 sondes of brand name or equal to the YSI Inc EXO2 sonde as described below. Each sonde must have all parameters as described, and be equipped with:

· Temperature,

· Conductivity,

· pH,

· Turbidity,

· Total Algae

· Optical Dissolved Oxygen sensors.

· Central Wiper

We additionally require 5 Total Algae sensors for our existing EXO2 sondes that do not already have them.

Each instrument as described below will also have a hard-sided case capable of protecting the sonde and its associated gear from damage by impact or compression by heavy weight.

Instrument Description

· The instrument will be a platform with universal ports that can accommodate a variety of sensors, which can be used or reconfigured at any time by the end user in the field. Similarly, the sensors shall have hermaphroditic wet‐mateable connectors, allowing them to be plugged interchangeably into any sensor port.

· The instrument will be designed to withstand the harsh conditions of field use by using rugged materials, including Titanium, laser‐welded probe housings to resist leaks; wet‐mateable connectors that resist corrosion; impact‐resistant and chemical‐resistant Xenoy polymer reinforced housing; and sapphire glass on optical sensor windows.

· The instrument will be equipped with built‐in Bluetooth wireless technology for cable‐free communications when calibrating, communicating and downloading data. An internal magnetic switch and external activation key for wireless control of the Bluetooth radio shall be included.

· The instrument will be capable of having connectorized field‐replaceable probes for the Dissolved Oxygen, Conductivity, Temperature, pH, ORP, Turbidity, Chlorophyll/Blue‐Green Total Algae, fDOM, and central wiper. These sensors shall be capable of being removed without opening the sonde or exposing the internal electronics to the environment.

· The instrument will provide low‐power consumption for extended deployments and must be able to measure Temperature, Conductivity, Depth, pH, ORP, Turbidity, Chlorophyll/Blue‐Green Total Algae, and Optical DO for duration of 60 days at a 15‐minute sampling interval.

· The instrument will be capable of operating in a self‐powering mode from an internal power supply using a set of four (4) “D” cell alkaline batteries, or rechargeable batteries that are available for purchase in most localities around the world. Batteries shall be removable via an external hatch without exposing its electronics. The instrument shall also have the capability of being powered by an external 12VDC‐power supply through an interface cable or via USB through the use of a Signal Output Adapter.

· All sensors must be “smart” and store all calibration data internally to the sensor. Sensors shall be able to swap from one sonde to another or from one sonde port to another without recalibration.

· The instrument will use a dissolved oxygen sensor that employs the Luminescent “Life Time” Dissolved Oxygen measurement technique. This sensor shall be capable of measuring dissolved oxygen in the range of 0‐20 mg/l with an accuracy of +/‐ 0.1 mg/l; and in the range of 0‐200% saturation with an accuracy of +/‐ 1% air saturation with a response time of T63<5 sec under all or zero flow conditions without the use of a stirring device. In addition the sensor must be able to measure dissolved oxygen in the range of 20‐50 mg/l with an accuracy spec at this range of +/‐ 5% of the reading; and in the range of 200‐500% saturation with an accuracy spec of +/‐ 5% of the reading. The optical DO sensor membrane must be field replaceable component that does not require the use of tools to replace. The Dissolved Oxygen sensor shall be able to be calibrated with a one‐point (saturated air or water) or a two‐point (zero DO and saturated air or water) oxygen calibration.

· The instrument will be capable of measuring chlorophyll and blue‐green algae with a Total Algae Sensor, a dual‐channel fluorescence sensor which measures both chlorophyll a and blue‐green algae (cyanobacteria) in a single probe.

· The instrument shall be capable of measuring turbidity with a Nephlometric type probe capable of measuring turbidity from 0‐4000 NTU. The sensor will have an accuracy of +/‐ 2% of reading or 0.3 NTUs (whichever is greater) in AMCO‐AEPA Polymer standards from 0‐999 NTU and an accuracy of +/‐ 5% of reading from 1000‐4000 NTU.

· The instrument shall be capable of having a non‐vented characterized depth sensor capable of measuring in the range of 0‐250 meters (0‐820 ft) of water with an accuracy of +/‐ 0.04% FS and a resolution of 0.001 meters or feet. Other ranges available: 0‐10 meter with an accuracy of +/‐ 0.04% FS and 0‐100 meter with an accuracy of +/‐ 0.04%.

- The instrument will be capable of measuring temperature using a NIST‐traceable calibrated thermistor in the range of ‐5 to 50 degrees C with an accuracy of +/‐ 0.01 degrees C and a resolution of 0.01 degrees C from ‐5 to 35 degrees C and an accuracy of +/‐0.05 degrees C from 35 to 50 degrees C. Each temperature sensor must include a factory calibration/NIST reference sheet.

· The instrument will be capable of measuring conductivity using a four‐electrode cell in the range of 0‐ 200 mS/cm with an accuracy of +/‐ 0.5% or 0.001 mS/cm and a resolution of 0.001 to 0.1 mS/cm. additionally the cell design should prevent bubbles from settling on electrodes and interfering with measurements. The conductivity sensor must be a linear device requiring only a single‐point calibration.

· The instrument will be capable of measuring pH in the range of 0‐14 with an accuracy of +/‐ 0.2 for the entire temperature range and a resolution of 0.01 using a combination electrode with a gel‐filled reference electrode. The sensor shall be able to measure to spec across all ionic strength waters. The pH sensor will be equipped with an internal amplifier to improve signal response and stability and utilize a replaceable probe head that can be field replaced at minimal cost.

· The instrument will have available as an output a salinity calculation based on the conductivity and temperature measurements in the range of 0‐70 PPT with an accuracy of 1.0% or +/‐ 0.1 ppt (whichever is greater) and a resolution of 0.01 ppt. The algorithms used for the calculation should be those found in the Standard Methods for Examination of Water and Wastewater.

· The instrument will provide antifouling protection with a central motorized wiper with rotating nylon‐ bristle brush that removes biofouling from all optical and pH sensors. The wiper shall be protected from sediment accumulation by a wiper guard (aka parking garage). The wiper shall be field‐serviceable and replaceable.

· The instrument will be supplied with a user‐friendly software program providing communication and data processing. Data shall be presented in both report and graphical form. The software program shall be capable of exporting data in Excel formats.

· The instrument will be capable of updating its internal and sensor software with newer versions in the field.

· The instrument software will be capable of advanced data collection settings, including Burst Sampling to collect a rapid set of data at each logging interval, and Adaptive Logging to use one or two sensors as triggers for a higher resolution logging interval based on pre‐determined thresholds for events.

· The instrument software will utilize Smart QC quality assurance checks to prevent faults, errors and lost data.

· The instrument will be compatible with the EXO handheld field display for calibrating, configuring, reporting and logging status.

· All sensor ports will have secondary backup seals, thus protecting the internal electronics from the environment.

· The instrument’s battery compartment must be sealed and protected by a safety device that protects the operator from a gas pressure build‐up in the battery compartment.

· The instrument will have, as a standard, 512 megabytes of non‐volatile flash disk memory capable of storing 1,000,000 individual readings as a standard. Loss of battery power shall not cause loss of memory, and a memory backup battery shall not be required.

· The instrument will support USB output and legacy SDI‐12 output through the use of Signal Output Adapters. The sonde must be able to log data internally and perform SDI‐12 functions to ensure data redundancy.

· The instrument will include a metal bulkhead to reduce the incidences of stripping threads and field replaceable titanium retaining nuts on sensors.

· The instrument will provide electrical overload protection to the individual sensors that will prevent data loss in the event that a single sensor experiences catastrophic failure.

· The instrument will provide an auxiliary port to integrate other sensors and support future expansion.