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Siemens QFM21 Series Temperature-Humidity Duct Sensor
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Siemens QFM21 Series duct sensors can be used for all systems or devices capable of acquiring and handling the sensor’s 0 to 10 Vdc, 4 to 20 mA or passive resistance output signals
Applications: Control sensors in supply or return air ducts, Reference sensors, for example, for shifting the dew point, Limit sensors, for Ex. in connection with steam humidifiers, Limit sensors, for Ex. measured value indication or for connection to a building automation and control system.
Siemens QFM21 Series is a duct sensor for relative humidity and temperature with basic features 24 Vac or 13.5 to 35 Vdc operating voltage, 0 to 10 Vdc or 4 to 20 mA signal output for relative humidity sensing, 0 to 10 Vdc or 4 to 20 mA, or Siemens Ni 1K ohm signal output for temperature sensing and +3% measuring accuracy for relative humidity, within the comfort range.
Please find the below information and select model from drop down:
| Part Number | Temperature | Temperature Signal Output | Humidity | Humidity Signal Output |
| QFM2100 | NA | NA |
0-100% |
0-10Vdc |
| QFM2110 |
–31°F to 140°F(–35°C to 60°C) |
1000 Ω Pt(0.00385) | ||
| QFM2120 | Siemens 1000 Ω Ni | |||
| QFM2160U |
–40°F to 158°F (–40°C to 70°C) OR –31°F to 95°F (−35°C to 35°C) |
0-10 Vdc | ||
| QFM2171 | 4-20 mA |
4-20 mA |
||
| QFM2101 |
NA |
NA |
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