Belimo 01CT-5QH01 : Cable Temperature Sensor, NTC 20K, 2" [50 mm] Stainless Probe, 6.5 ft Bare Copper Shielded Plenum Cable, IP67 / NEMA 4X, 5-Year Warranty

What sensing element does the Belimo 01CT-5QH01 use?

The 01CT-5QH01 uses a passive NTC20k thermistor element with a nominal resistance of 20,000 Ω at 77°F [25°C] and an accuracy of ±0.35°F @ 77°F [±0.2°C @ 25°C]. Configure the controller input for the NTC20k curve.

What temperature range does the 01CT-5QH01 measure?

The measuring range is -13...167°F [-25...75°C]. Ambient temperature, fluid temperature and the plenum cable rating all cover the same -13...167°F [-25...75°C] range.

Is the 01CT-5QH01 an active or passive sensor?

Passive. The 01CT-5QH01 outputs a passive NTC20k temperature signal over a 2-wire cable connection. Because a 2-wire passive sensor self-heats, the current through it should not be higher than the specified measuring current (<0.5 mA @ 77°F [25°C]), or measurement accuracy is affected.

Can the 01CT-5QH01 measure water temperature in a pipe?

Yes. Install the probe in a Belimo A-22P-A.. thermowell (immersion sleeve) with thermal contact fluid, such as the A-22P-A44 syringe with thermal paste. A-22P-A.. thermowells have a 1/2" NPT connection. Fabricated stainless steel and fabricated brass thermowells come in 2", 4", 6", 8", 12" and 18" [50, 100, 150, 200, 300 and 450 mm] lengths; machined stainless steel thermowells come in 2", 4", 6" and 8" [50, 100, 150 and 200 mm] lengths. Typical time constant is 7 s with a brass thermowell and 9 s with a stainless steel thermowell, and fluid temperature is rated -13...167°F [-25...75°C].

How should the thermowell be oriented in the pipe?

On pipes DN 50 (2") and smaller, install the thermowell at a 45° angle or in a pipe elbow. On pipes DN 65 (2-1/2") and larger, install it at 90° to the pipe.

How do I mount the 01CT-5QH01 in an air duct?

Use a mounting flange for 6 mm sensor probes: A-22D-A03 (plastic, up to max. 248°F [120°C]) or A-22D-A05 (brass, up to max. 260°C). Fix the flange to the duct, insert the probe through it, then lock the probe by tightening the hex nut with a wrench (A-22D-A03) or the screw with a screwdriver (A-22D-A05). Typical time constant in the duct is 155 s at 0 m/s and 35 s at 3 m/s air velocity.

What resistance should the 01CT-5QH01 read at 32°F and 77°F?

70,200 Ω at 32°F [0°C] and 20,000 Ω at 77°F [25°C]. The resistance table on this page covers -4 to 158°F [-20 to 70°C]; the NTC20k resistance formula constant is 4262.

Does connecting cable length affect the 01CT-5QH01 reading?

Yes. With lengthy connecting cables, the cable resistance must be taken into account; it depends on the conductor cross section and adds an offset to the measurement. The lower the sensor impedance, the greater the effect of line resistance.