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 QFM81.2 Duct Hygrostat with External Setpoint, 30 - 90% RH | Midwest Supply Us
QFM81.2 | Duct Hygrostat with External Setpoint, 30 - 90% RH | Siemens
Brand: Siemens
SKU: QFM81.2
$155.20 each
View Details Siemens 544-339-18 Duct Point Sensor, 1K Ohm Platinum (375 Alpha), 18-Inch | Midwest Supply Us
544-339-18 | Duct Point Sensor, 1K Ohm Platinum (375 Alpha), 18-Inch | Siemens
Brand: Siemens
SKU: 544-339-18
$40.98 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
$243.82 each
View Details Siemens AQF3150 Replacement Sensor Tip 2 percent RH Duct | Midwest Supply Us
AQF3150 | Replacement Sensor Tip 2 percent RH Duct | Siemens
Brand: Siemens
SKU: AQF3150
$153.37 each
View Details Siemens SAS81.33U Powermite 599 MT Series SAS Electronic Valve Actuator, SR, 24V, Float Control | Midwest Supply Us
SAS81.33U | Powermite 599 MT Series SAS Electronic Valve Actuator, SR, 24V, Float Control | Siemens
Brand: Siemens
SKU: SAS81.33U
$295.61 each
View Details Veris HD2XVSTA1 RH Duct | 2% | 5/10VDC | T-Xmtr | -58to122F | Midwest Supply Us
HD2XVSTA1 | RH Duct | 2% | 5/10VDC | T-Xmtr | -58to122F | Veris
Brand: Veris
SKU: HD2XVSTA1
$279.80 each
View Details Veris HD2XMSTH2 RH Duct | 2% | 4-20mA | Temp | 10k T3 | 2PT CAL | Midwest Supply Us
HD2XMSTH2 | RH Duct | 2% | 4-20mA | Temp | 10k T3 | 2PT CAL | Veris
Brand: Veris
SKU: HD2XMSTH2
$244.88 each
View Details Veris HD2XVSTH RH Duct | 2% | 5/10VDC | Temp | 10k T3 | Midwest Supply Us
HD2XVSTH | RH Duct | 2% | 5/10VDC | Temp | 10k T3 | Veris
Brand: Veris
SKU: HD2XVSTH
$207.88 each
View Details Siemens 544-339-8 Duct Point Sensor, 1K Ohm Platinum (375 Alpha), 8-Inch | Midwest Supply Us
544-339-8 | Duct Point Sensor, 1K Ohm Platinum (375 Alpha), 8-Inch | Siemens
Brand: Siemens
SKU: 544-339-8
$39.75 each
View Details Siemens 544-339-4 Duct Point Sensor, 1K Ohm Platinum (375 Alpha), 4-Inch | Midwest Supply Us
544-339-4 | Duct Point Sensor, 1K Ohm Platinum (375 Alpha), 4-Inch | Siemens
Brand: Siemens
SKU: 544-339-4
$39.75 each
View Details ACI A/CP-DO-8" 10K ohm Type II | Duct Temperature Sensor | Sensor Length: 8 inch | Midwest Supply Us
A/CP-DO-8" | 10K ohm Type II | Duct Temperature Sensor | Sensor Length: 8 inch | ACI
Brand: ACI
SKU: A/CP-DO-8"
$13.05 each
View Details ACI A/CP-D-8"-GD 10K ohm Type II | Duct Temperature Sensor | Sensor Length: 8 inch | Galvanized Housing Enclosure Box | Midwest Supply Us
A/CP-D-8"-GD | 10K ohm Type II | Duct Temperature Sensor | Sensor Length: 8 inch | Galvanized Housing Enclosure Box | ACI
Brand: ACI
SKU: A/CP-D-8"-GD
$13.78 each
View Details Siemens QFM2101 Duct Relative Humidity Temperature Sensor, 5 percent accuracy, 4-20 mA | Midwest Supply Us
QFM2101 | Duct Relative Humidity Temperature Sensor, 5 percent accuracy, 4-20 mA | Siemens
Brand: Siemens
SKU: QFM2101
$154.78 each
View Details ACI A/1K-2W-D-8"-PB RTD 1000 ohm (2 wire) | Duct Temperature Sensor | Sensor Length: 8 inch | Plastic Box Plain Housing Enclosure Box | Midwest Supply Us
A/1K-2W-D-8"-PB | RTD 1000 ohm (2 wire) | Duct Temperature Sensor | Sensor Length: 8 inch | Plastic Box Plain Housing Enclosure Box | ACI
Brand: ACI
SKU: A/1K-2W-D-8"-PB
$19.94 each
View Details ACI A/1K-2W-DO-6" RTD 1000 ohm (2 wire) | Duct Temperature Sensor | Sensor Length: 6 inch | Midwest Supply Us
A/1K-2W-DO-6" | RTD 1000 ohm (2 wire) | Duct Temperature Sensor | Sensor Length: 6 inch | ACI
Brand: ACI
SKU: A/1K-2W-DO-6"
$19.58 each
View Details ACI A/CP-D-8"-PB 10K ohm Type II | Duct Temperature Sensor | Sensor Length: 8 inch | Plastic Box Plain Housing Enclosure Box | Midwest Supply Us
A/CP-D-8"-PB | 10K ohm Type II | Duct Temperature Sensor | Sensor Length: 8 inch | Plastic Box Plain Housing Enclosure Box | ACI
Brand: ACI
SKU: A/CP-D-8"-PB
$13.78 each
View Details Siemens QFM3101 Duct Relative Humidity Sensor, 2 percent accuracy, 4-20 mA | Midwest Supply Us
QFM3101 | Duct Relative Humidity Sensor, 2 percent accuracy, 4-20 mA | Siemens
Brand: Siemens
SKU: QFM3101
$220.96 each
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
$178.18 each
View Details Siemens QVM62.1 Air Velocity Sensor, 0 to 10 Vdc | Midwest Supply Us
QVM62.1 | Air Velocity Sensor, 0 to 10 Vdc | Siemens
Brand: Siemens
SKU: QVM62.1
$187.30 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
$165.46 each
View Details ACI A/RH1-D 1% Accuracy RH Humidity Sensor | Duct Humidity Sensor | Midwest Supply Us
A/RH1-D | 1% Accuracy RH Humidity Sensor | Duct Humidity Sensor | ACI
Brand: ACI
SKU: A/RH1-D
$285.98 each
View Details Belimo 22DTM-56 Duct CO2+Temp+Hum Sensor BAC | Midwest Supply Us
22DTM-56 | Duct CO2+Temp+Hum Sensor BAC | Belimo
Brand: Belimo
SKU: 22DTM-56
$522.00 each
View Details Belimo 22DTM-5106 Duct CO2+Temp+Hum Sensor LCD V | Midwest Supply Us
22DTM-5106 | Duct CO2+Temp+Hum Sensor LCD V | Belimo
Brand: Belimo
SKU: 22DTM-5106
$594.46 each
View Details Belimo 22DTM-51 Duct CO2+Temp+Hum Sensor V | Midwest Supply Us
22DTM-51 | Duct CO2+Temp+Hum Sensor V | Belimo
Brand: Belimo
SKU: 22DTM-51
$509.40 each
Communication
Dimension Depth
Dimension Height
Dimension Probe Diameter
Dimension Probe Length
Dimension Width
Element Type
Enclosure Material
Humidity Output
Measurement Type
Mounting
Operating Temperature
Output Specifications
Outputs
Range
Sensing Element
Sensor
Sensor Configuration
Sensor Housing
Sensor Length
Sensor Wire Length
Temp & Humidity Signals
Temperature Calibration Certificate
Temperature Measurement Accuracy
Temperature Measurement Range
Temperature Sensor
Temperature Sensor Type
Voltage
Warranty
°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" | 1/4" Orifice | GREEN 6.5-16" WC | Midwest Supply Us
NGR02-BBA | Gas Regulator | 3/4" | 1/4" Orifice | GREEN 6.5-16" WC | Norgas Controls
Brand: Norgas Controls
SKU: NGR02-BBA
$86.98
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
$104.49
Norgas Controls N5D-1500-S GAS REGULATOR 1-1/2" NPT 7-11"WC CSA | Midwest Supply Us
N5D-1500-S | GAS REGULATOR 1-1/2" NPT 7-11"WC CSA | Norgas Controls
Brand: Norgas Controls
SKU: N5D-1500-S
$294.63
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
$16.20
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
$77.85
Everflow EPRC1501-NL 1-1/2" X 1" F1807 PEX Reducing Coupling Lead Free Pack of 10 | Midwest Supply Us
EPRC1501-NL | 1-1/2" X 1" F1807 PEX Reducing Coupling Lead Free Pack of 10 | Everflow
Brand: Everflow
SKU: EPRC1501-NL
$88.70
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