MIC specifications.pdf

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Measuring Ionization Chamber (MIC) System
Solicitation number
CPS-2112-24-0026
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This document contains the specifications for a Measuring Ionization Chamber (MIC) System, which is a reference smoke density measuring device used in conjunction with the UL smoke box for testing smoke alarms and detectors. The key details are:

The MIC system measures the smoke density within the UL smoke box as specified in UL 217 and UL 268. It includes a smoke ionization chamber with specific technical requirements, a flow control unit, a control unit, and an air sampling vacuum pump. The U.S. Consumer Product Safety Commission (CPSC) intends to use the MIC system to test smoke alarms to the UL 217 standard at its National Product Testing and Evaluation Center (NPTEC).

This is a Request for Quotation (RFQ) for the MIC system, which must be provided on a firm-fixed price basis. Quotes are due by August 30, 2024 at 12:00pm Eastern. Award will be made to the lowest priced technically acceptable offeror, subject to available funding and offeror responsibility. The solicitation includes standard FAR clauses applicable to commercial item procurements.

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Measuring Ionization Chamber (MIC) System Specifications

The MIC system is a reference smoke density measuring device used in conjunction with the UL smoke box for testing smoke alarms and detectors. The MIC system measures the smoke density within the UL smoke box as specified in UL 217 and UL 268

1. MIC Smoke Ionization Chamber (measuring head)

a. Quiescent current: 100 pA (nominal)

b. Chamber impedance: 1.9 x 1011 Ω ± 5%

c. Radioactive source: Am241

d. Activity: 129.5 kBq (3.5 μ Ci) ± 5%

e. Average a – energy: 4.5 MeV ± 5%

f. Time delay: < 10 sec. at 30 l/min. flow rate

g. Calibrated to a known reference within ± 3% smoke sensitivity

h. Calibration certificate

2. Flow Control Unit

a. Flow rate: Adjustable between 0 – 50 l/min.

b. Filter r Replaceable filter element

c. Display range 0,00 - 1.00, output 0-10 VDC

3. Control unit for the MIC

a. Bench top/rack cabinet with power supply for MIC

b. LED display of chamber voltage or smoke density

c. Zero and full-scale adjustment

d. Analogue outputs: X (0.0 – 10.0 VDC), chamber voltage Uc (14-25 VDC approx.)

e. Mains supply: 100-240 VAC, 50-60 Hz

4. Air sampling vacuum pump and tubing to work with the above MIC

a. Mains requirements: 115 VAC ± 10%, 50-60 Hz

b. Motor rating: Approx. 0.15 kW

c. Capacity: Approx. 60 l/min.

File details come from the government source that posted it. Updated .