The 01CT-5QPF1-4 is a Belimo passive cable temperature sensor with a NTC 20K thermistor sensing element on a 8" stainless steel probe, supplied with 9.8 ft of bare copper shielded plenum cable, black jacket and a plastic mounting flange. It ships with the A-22D-A03 plastic mounting flange installed for single-hole duct mount. The cable jacket is rated to -13 to 167°F; the stainless steel probe handles the same range. The signal returns directly to the controller as a resistance — no 24V supply or signal conditioning required.
Supply, return, mixed-air, and outdoor-air duct temperature in air handlers and rooftop units when a single-hole duct probe with built-in mounting flange is the fastest install. Pre-integrated flange eliminates a parts pull at the jobsite.
Key Features
Stainless steel sensing probe rated NEMA 4X / IP67. Suitable for duct air, mechanical-room environments, and — with a thermowell — direct fluid immersion.
Factory-trimmed NTC 20K element delivers stable long-term accuracy with no field calibration required.
Ships with the A-22D-A03 plastic mounting flange pre-installed for fast single-hole duct mount. No separate parts pull required.
Passive resistance returns directly to the controller — no 24V supply, no signal conditioning, no scaling required.
9.8 ft of bare copper shielded plenum cable, black jacket runs from the probe directly to the controller terminations — no exterior junction box on the duct.
Industry-leading factory warranty backed by Belimo's worldwide service network.
Technical Specifications
| Specification | Detail |
|---|---|
| Sensor Style | Cable temperature sensor with stainless steel probe and pre-installed mounting flange |
| Measured Value | Temperature |
| Sensing Element | NTC 20K thermistor |
| Measuring Range | -13...167°F [-25...75°C] |
| Probe Length | 8" [200 mm] |
| Probe Diameter | 0.24" [6 mm] |
| Probe Material | Stainless steel |
| Cable | 9.8 ft [3 m] bare copper shielded plenum cable, black jacket, 22AWG, 2-wire, 300 V |
| Application | air (duct mount) |
| Mounting | Pre-installed mounting flange (single-hole duct mount) |
| Process Connection | Plastic flange (included) |
| Enclosure Rating | NEMA 4X / IP67 |
| Protection Class | IEC/EN III, Protective Extra-Low Voltage (PELV) |
| UL Approval | cULus per UL60730-1A/-2-9, CAN/CSA E60730-1/-2-9 |
| Power Required | None — passive resistance element |
| Weight | 0.18 lb |
| Manufacturer | Belimo |
| Manufacturer Part Number | 01CT-5QPF1-4 |
| Warranty | 5-year factory warranty |
Compatible Accessories
Mounting flange A-22D-A03 is included with this SKU. For most duct-mount applications, no additional accessories are required. For higher-temperature ducts (above 248°F), consider upgrading to the brass mounting flange.
Documentation
Frequently Asked Questions
Does this need 24V power?
No. The 01CT-5QPF1-4 is a passive resistance temperature sensor — the controller reads its element directly through the analog input. No 24V supply or signal conditioner needed.
What sensing element is in the 01CT-5QPF1-4?
The 01CT-5QPF1-4 uses a NTC 20K thermistor. The first letter after '01CT-5' identifies the element: A=Pt 100, B=Pt 1000, E=Ni 1000 (JCI), L=NTC 10K Type II, M=NTC 10K Type III (Precon), Q=NTC 20K. Match this to your controller's input curve.
What does the probe length code mean?
The letter after the element code encodes probe length: H=2", L=4", P=8". This SKU has a 8" probe.
What's included with the F1-4 variant?
The F1-4 ships with the A-22D-A03 plastic mounting flange pre-installed for single-hole duct mount. The cable is 9.8 ft (vs 6.5 ft on the standard variant). The application is air-duct only — for fluid immersion, use the standard 01CT-5.. variant with a thermowell.
Can I use this on a water or chilled-water line?
No — the F1-4 variant is rated for air duct only. For liquid immersion in chilled water, hot water, or condenser water, use the standard 01CT-5.. variant with a matching length thermowell from the A-22P-A.. series.
Does it work with my BAS?
Any BAS controller with a temperature input configured for the NTC 20K curve will read this sensor directly. See the linked Resistance Characteristics PDF for the full curve table at standard temperature points.
How is this different from the 01DT duct sensor?
The 01DT mounts in a NEMA 4X polymer enclosure on the duct exterior with terminals inside the box. The 01CT terminates directly via the cable — no exterior junction box, cleaner installs into a controller panel. Both use the same passive elements and the same family of thermowells when used for liquid immersion.
- Sensor Type:
- Probe with Mounting Flange
- Probe Length:
- 8 Inch
- Temperature Element:
- 20K Thermistor
- Lead Length:
- 10 Foot Plenum Rated Cable
- Enclosure:
- No Box
- Supported Protocols:
- None
- Humidity Element:
- None
- CO2 Element:
- None
- Setpoint:
- No Setpoint
- Override:
- No Override
- Display:
- No Display
