Starting at $224.00
Starting at $201.60

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Features

  • 2 channels (humidity and temperature)
  • Wall and duct mount versions
  • Measuring range:
    • RH; 0 to 100%
    • Temp (wall); 32 to 140°F( 0 to 60°C)
    • Temp (duct); -4 to 158°F (-20 to 70°C)
  • Accuracy:
    • ±2.0 %RH (0 to 90 %RH)
    • ±4 %RH (90 to 100 %RH)
    • ±0,5 °C / 0,9 °F temp
  • Output:
    • 4 to 20 mA (2-wire)
    • 0 to 1/5/10 V (4-wire)
  • Measuring rate of 1 per second

The Testo 6621 Humidity Transmitter is a highly accurate sensor with long-term stability (±2.0% RH). The 6621 has attractive housing that blends into any environment. Duct mount or wall mount version are available. The 6621 is provided with a display and an external probe as options. The sensors and the analog outputs can be adjusted, analyzed and parameterized via the external interface using the P2A software. The 6621 is a high-performance transmitter for a low price. It meets the increasing requirements in automated building services in terms of accuracy, reliability and safety and thereby saves energy costs.

Calibration

Testo RH Calibration Set
Perform quick checks or full calibrations for humidity probes
$360.00
$324.00

Power Supplies

Testo Power Supply
Wall-mountable 110-240 VAC box power supply
$180.00
$162.00
Testo DIN Rail Power Supply
DIN rail mountable 90-240 VAC power supply
$226.00
$203.40

Accessories

Please consider these optional accessories.

Testo Wall / Duct  Transmitter Holder
Testo Wall / Duct Transmitter Holder
$49.00
$44.10
Testo Pressure-tight Screw Connection
Testo Pressure-tight Screw Connection
$229.00
$206.10