Duct Sensors: Essential for HVAC Efficiency and Comfort

Midwest Supply offers a wide selection of duct sensors for precise airflow temperature and humidity monitoring. Our sensors are designed to ensure optimal HVAC performance, prevent costly damage, and maintain comfortable indoor environments.
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View Details Siemens QFM2160U Duct RH and Temp Sensor, 5 percent accuracy, RH: 0-10 Vdc, T: 0-10 Vdc | Midwest Supply Us
QFM2160U | Duct RH and Temp Sensor, 5 percent accuracy, RH: 0-10 Vdc, T: 0-10 Vdc | Siemens
Brand: Siemens
SKU: QFM2160U
$184.41 each
View Details ACI A/RH2-D 2% Accuracy RH Humidity Sensor | Duct Humidity Sensor | Midwest Supply Us
A/RH2-D | 2% Accuracy RH Humidity Sensor | Duct Humidity Sensor | ACI
Brand: ACI
SKU: A/RH2-D
$194.53 each
View Details ACI A/AN-D-4"-GD 10K ohm Type III | Duct Temperature Sensor | Sensor Length: 4 inch | Galvanized Housing Enclosure Box | Midwest Supply Us
A/AN-D-4"-GD | 10K ohm Type III | Duct Temperature Sensor | Sensor Length: 4 inch | Galvanized Housing Enclosure Box | ACI
Brand: ACI
SKU: A/AN-D-4"-GD
$16.31 each
View Details ACI A/AN-DO-8" 10K ohm Type III | Duct Temperature Sensor | Sensor Length: 8 inch | Midwest Supply Us
A/AN-DO-8" | 10K ohm Type III | Duct Temperature Sensor | Sensor Length: 8 inch | ACI
Brand: ACI
SKU: A/AN-DO-8"
$15.23 each
View Details ACI A/CP-DO-4" 10K ohm Type II | Duct Temperature Sensor | Sensor Length: 4 inch | Midwest Supply Us
A/CP-DO-4" | 10K ohm Type II | Duct Temperature Sensor | Sensor Length: 4 inch | ACI
Brand: ACI
SKU: A/CP-DO-4"
$15.23 each
View Details Siemens QPM2162 Duct Sensor CO2 + Temperature + Relative Humidity, 0 to 10V | Midwest Supply Us
QPM2162 | Duct Sensor CO2 + Temperature + Relative Humidity, 0 to 10V | Siemens
Brand: Siemens
SKU: QPM2162
$630.81 each
View Details Siemens 535-490-24 Rigid Averaging Duct Sensor, 20 to 120 Deg F, 24-Inch | Midwest Supply Us
535-490-24 | Rigid Averaging Duct Sensor, 20 to 120 Deg F, 24-Inch | Siemens
Brand: Siemens
SKU: 535-490-24
$103.33 each
View Details Dwyer TE-DFN-B0448-00 Air Duct Temperature Sensor | 4 inch probe | 10K Ohm Type II Thermistor | 8 foot plenum cable. | Midwest Supply Us
TE-DFN-B0448-00 | Air Duct Temperature Sensor | 4 inch probe | 10K Ohm Type II Thermistor | 8 foot plenum cable. | Dwyer
Brand: Dwyer
SKU: TE-DFN-B0448-00
$14.74 each
View Details Siemens QAM2171.040 Duct Temperature Sensor, 4 to 20 mA, 16-Inch | Midwest Supply Us
QAM2171.040 | Duct Temperature Sensor, 4 to 20 mA, 16-Inch | Siemens
Brand: Siemens
SKU: QAM2171.040
$126.87 each
View Details Siemens QFM2100 Duct Relative Humidity Sensor, 5 percent accuracy, 0-10 Vdc | Midwest Supply Us
QFM2100 | Duct Relative Humidity Sensor, 5 percent accuracy, 0-10 Vdc | Siemens
Brand: Siemens
SKU: QFM2100
$160.20 each
View Details BAPI BA/1K-H200-D-BB2 Duct Humidity (%RH) Sensor with Optional Temperature Sensor | Midwest Supply Us
BA/1K-H200-D-BB2 | Duct Humidity (%RH) Sensor with Optional Temperature Sensor | BAPI
Brand: BAPI
SKU: BA/1K-H200-D-BB2
View Details
View Details BAPI BA/AQPF-D-C-B-1-C82-N-A CO2 - "24/7" BAPI-Stat "Quantum Prime" CO2, Temp and Humidity Sensor, Constant Occupancy | Midwest Supply Us
BA/AQPF-D-C-B-1-C82-N-A | CO2 - "24/7" BAPI-Stat "Quantum Prime" CO2, Temp and Humidity Sensor, Constant Occupancy | BAPI
Brand: BAPI
SKU: BA/AQPF-D-C-B-1-C82-N-A
View Details
View Details BAPI BA/T1K[-7 TO 49C]-D-4"-BBX Duct Temperature Transmitter | Midwest Supply Us
BA/T1K[-7 TO 49C]-D-4"-BBX | Duct Temperature Transmitter | BAPI
Brand: BAPI
SKU: BA/T1K[-7 TO 49C]-D-4"-BBX
View Details
View Details BAPI BA/T1K[20 TO 120F]-D-18"-BBX Duct Temperature Transmitter | Midwest Supply Us
BA/T1K[20 TO 120F]-D-18"-BBX | Duct Temperature Transmitter | BAPI
Brand: BAPI
SKU: BA/T1K[20 TO 120F]-D-18"-BBX
View Details
View Details Siemens 544-560-18 Duct Point Sensor, Platinum, -4 to 122 Deg F, 18-Inch | Midwest Supply Us
544-560-18 | Duct Point Sensor, Platinum, -4 to 122 Deg F, 18-Inch | Siemens
Brand: Siemens
SKU: 544-560-18
$84.66 each
View Details Siemens 544-342-24 Flexible Averaging Duct Sensor, 1K Ohm Platinum, 24-Foot | Midwest Supply Us
544-342-24 | Flexible Averaging Duct Sensor, 1K Ohm Platinum, 24-Foot | Siemens
Brand: Siemens
SKU: 544-342-24
$123.21 each
View Details ACI A/AN-D-4"-PB 10K ohm Type III | Duct Temperature Sensor | Sensor Length: 4 inch | Plastic Box Plain Housing Enclosure Box | Midwest Supply Us
A/AN-D-4"-PB | 10K ohm Type III | Duct Temperature Sensor | Sensor Length: 4 inch | Plastic Box Plain Housing Enclosure Box | ACI
Brand: ACI
SKU: A/AN-D-4"-PB
$16.68 each
View Details ACI A/1K-2W-D-18"-GD RTD 1000 ohm (2 wire) | Duct Temperature Sensor | Sensor Length: 18 inch | Galvanized Housing Enclosure Box | Midwest Supply Us
A/1K-2W-D-18"-GD | RTD 1000 ohm (2 wire) | Duct Temperature Sensor | Sensor Length: 18 inch | Galvanized Housing Enclosure Box | ACI
Brand: ACI
SKU: A/1K-2W-D-18"-GD
$27.19 each
View Details ACI A/10KS-DO-4" 10K ohm | Duct Temperature Sensor | Sensor Length: 4 inch | Midwest Supply Us
A/10KS-DO-4" | 10K ohm | Duct Temperature Sensor | Sensor Length: 4 inch | ACI
Brand: ACI
SKU: A/10KS-DO-4"
$15.59 each
View Details ACI A/1K-NI-D-8"-PB RTD 1000 ohm (Nickel) | Duct Temperature Sensor | Sensor Length: 8 inch | Plastic Box Plain Housing Enclosure Box | Midwest Supply Us
A/1K-NI-D-8"-PB | RTD 1000 ohm (Nickel) | Duct Temperature Sensor | Sensor Length: 8 inch | Plastic Box Plain Housing Enclosure Box | ACI
Brand: ACI
SKU: A/1K-NI-D-8"-PB
$20.30 each
View Details ACI A/AN-D-18"-GD 10K ohm Type III | Duct Temperature Sensor | Sensor Length: 18 inch | Galvanized Housing Enclosure Box | Midwest Supply Us
A/AN-D-18"-GD | 10K ohm Type III | Duct Temperature Sensor | Sensor Length: 18 inch | Galvanized Housing Enclosure Box | ACI
Brand: ACI
SKU: A/AN-D-18"-GD
$18.49 each
View Details Siemens 544-342-16 Flexible Averaging Duct Sensor, 1K Ohm Platinum, 16-Foot | Midwest Supply Us
544-342-16 | Flexible Averaging Duct Sensor, 1K Ohm Platinum, 16-Foot | Siemens
Brand: Siemens
SKU: 544-342-16
$114.46 each
View Details Siemens 536-382 Air Velocity Sensor Pickup Probe Kit, 2-pipe, 12" (305 mm) | Midwest Supply Us
536-382 | Air Velocity Sensor Pickup Probe Kit, 2-pipe, 12" (305 mm) | Siemens
Brand: Siemens
SKU: 536-382
$75.53 each
View Details Siemens QFM3171 Duct RH and Temp Sensor, 2 percent (high) accuracy, RH: 4-20 4 T: 4-20 mA | Midwest Supply Us
QFM3171 | Duct RH and Temp Sensor, 2 percent (high) accuracy, RH: 4-20 4 T: 4-20 mA | Siemens
Brand: Siemens
SKU: QFM3171
$252.36 each
Communication
Element Type
Humidity Output
Sensing Element
Sensor
Sensor Configuration
Sensor Housing
Sensor Length
Sensor Wire Length
Temp & Humidity Signals
Temperature Sensor
Voltage
°F or °C Display
Committed to customer satisfaction
as experts in Duct Sensors
(847) 773-1023

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Norgas Controls NGR02-BBA GAS REGULATOR | 3/4" NPT | 1/4" Orifice | GREEN SPRING 6.5"-16" WC| | Midwest Supply Us
NGR02-BBA | Gas Regulator | 3/4" NPT | 1/4" Orifice | Green Spring 6.5"-16"wc | Norgas Controls
Brand: Norgas Controls
SKU: NGR02-BBA
$82.63
BAPI BA/10K-2-H210-D-BBX Duct Humidity (%RH) Sensor with Optional Temperature Sensor | Midwest Supply Us
BA/10K-2-H210-D-BBX | Duct Humidity (%RH) Sensor with Optional Temperature Sensor | BAPI
Brand: BAPI
SKU: BA/10K-2-H210-D-BBX
$108.17
Norgas Controls N5D-1500-S GAS REGULATOR, 1-1/2" NPT, SILVER SPRING 7-11"WC, 2 PSI CSA | Midwest Supply Us
N5D-1500-S | GAS REGULATOR, 1-1/2" NPT, SILVER SPRING 7-11"WC, 2 PSI CSA | Norgas Controls
Brand: Norgas Controls
SKU: N5D-1500-S
$252.54
BAPI ZPS-ACC04-1 Room Pressure Pickup Ports with Temperature Sensor | Midwest Supply Us
ZPS-ACC04-1 | Room Pressure Pickup Ports with Temperature Sensor | BAPI
Brand: BAPI
SKU: ZPS-ACC04-1
$16.77
Belimo B214 Characterized Control Valve (CCV), 1/2", 2-way | Midwest Supply Us
B214 | Characterized Control Valve (CCV), 1/2", 2-way | Belimo
Brand: Belimo
SKU: B214
$90.90
Everflow EPRC1501-NL EVERFLOW 1-1/2" X 1" PEX BARB RED. COUPLING LEAD FREE | Midwest Supply Us
EPRC1501-NL | EVERFLOW 1-1/2" X 1" PEX BARB RED. COUPLING LEAD FREE | Everflow
Brand: Everflow
SKU: EPRC1501-NL
$9.81
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