testo 6651 – moisture transmitter for sensitive environments
Moisture transmitter with Testo's highly accurate and long-term stable moisture sensor
- Robust precision transmitter
- -30...120°C
- 0...100%RH
testo 6651 - transmitter for sensitive environments and cleanrooms
The testo 6651 is placed in the medium-high performance range. It is designed for the monitoring and control of sensitive environments in process engineering and for the control of compressed air systems.
Advantages of the testo 6651
- This new series of transmitters has interchangeable sensors, which are adapted to the application.
- The P2A adjustment and setting software gives you total control over the instrument.
- You can scale/calibrate/adjust the output signal on all outputs including the analog output.
- A further advantage is that the transmitter can be powered via USB.
- Adjustment or analysis can therefore be carried out without any other wiring - e.g. on the table or in the service workshop.
- Integrated relays (optional)
- Display (optional)
Using the optional display and the four buttons on the front, you can easily adjust, commission and analyze the instrument on site without a PC if you don't have access to one.
Thanks to the new digital plug-in sensors, it is very easy to change sensors without tools. There is also no need to readjust the transmitter as the 6600 series sensors used in the 6651 have a fully digital interface to the transmitter, which is calibrated and adjusted on delivery.
Contact us for prices and more information
| Enclosure Material | Plastic enclosure |
| Size | 122 x 162 x 77 mm |
| Measurement range | Humidity: 0...100 %RH Temperature: -30...+150°C |
| Protection class | IP65 |
| Working temperature of instrument housing | -40 to +70 °C Display: 0 to +50 °C |
| Storage temp | -40...+80°C |
| Display resolution | 0.1%RH / 0.1°C |
| Sensor connection | Digital "plug-in" connection |
| Screw connection | M 16 x 1.5 (2x) with inner diameter 4-8 mm M 20 x 1.5 (2x) with inner diameter 6-12 mm |
| Display | 2-line LCD with clear text (display is optional) and indication of relay status |
| Analog output: | |
| Accuracy: Current | 4...20 mA ±0.03 mA (2-wire) 0...20 mA ±0.03 mA (4-wire) 4...20 mA ±0.03 mA (4-wire) for heated sensor |
| Accuracy: Voltage | 0 to1 V ±1.5 mV(4-wire) 0 to5 V ±7.5 mV (4-wire) 0 to10 V ±15 mV(4-wire) |
| Resolution | 12 bits |
| Max load | 2 thread 12 VDC: 100 Ohms 24 VDC: 500 Ohm 30 VDC: 625 Ohms 4-wire 500 Ohm |
| Galvanic isolation | Galvanic isolation on the outputs (2-wire and 4-wire), isolation between the supply and the outputs (4-wire) |
| Analog output/Temp | |
| EMC | 2004/108/EC |
| Units | Temperature in C° / F° Relative humidity %F / %RH Dew point in °Ctd /°Ftd |
| Relay output | 4 pcs up to 256 VAC /3A NC/C/NO (optional) |
| Digital output | Mini Din for Testo P2A software and Testo 400/650 (optional) |
| Power supply | 2-wire: 24VDC ±10% Galvanic isolation on the outputs (2-wire and 4-wire), isolation between the supply and the outputs (4-wire) 2004/108/EC 4-wire: 20...30VAC/DC, 200mA max current consumption |
| Measuring medium | Air, Nitrogen, more on request |
| Weight | 0.62kg (without sensor) |
Moisture probes
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Wall-mounted humidity sensor 6601
SKU L01Highly accurate humidity sensor for measuring indoor relative humidity. Mounted on a wall.
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Indoor sensor 6602 for duct mounting
SKU L02Indoor sensor for measuring relative humidity in ducts
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Climate sensor 6603 for duct mounting
SKU L03Duct mounted climate sensors for higher temperatures
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Climate sensor 6604 with cable
SKU L04Climate sensor with cable for measuring relative humidity.
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Stainless steel process sensor 6605
SKU L05Stainless steel process sensor with cable for higher temperatures. Measuring parameters: %F/%RH, °Ctd/°Ftd, °C/°F.
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Teflon filter for humidity sensors 12 mm
1 332 SKU 0554 9913Teflon filter for sensor Ø12 mm, with 1.5 mm hole for drainage of any condensation water.
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Screw connection
1 950 SKU 0554 1796Stainless steel screw connection with Teflon ring for 12 mm diameter sensors. Pressure tight up to 6 bar.
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Power supplies for Hygrotest
2 590 SKU 0554 1748Power supply 220 V - 24 V DC, for Hygrotest. Input: 110 ... 240 VDC. Output: 24 VDC/350 mA.
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P2A software
2 180 SKU 0554 6020P2A software for PC for settings, adjustments and analysis.
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Power supply unit (DIN rail mounting)
3 150 SKU 0554 1749Mesh thread for DIN rail. Input: 85 ... 264 VAC | 110 ... 300 VDC. Output: 24 VDC/2.5 A.
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Wall and duct holders
525 SKU 0554 6651Wall and duct holder for the testo 6621 moisture transmitter.
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Control and adjustment kit
3 675 SKU 0554 0660Control and adjustment kit for moisture meters. Consists of two moisture jars containing salt solutions of 11,3 %RH and 75,3 %RH respectively. Incl. adapter for humidity sensors.
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Teflon filter for humidity sensors 12 mm
770 SKU 0554 0756Teflon filter for humidity sensors Ø 12 mm. Screwed to the sensor. Protects against dirt, particles, corrosives and high air speeds. Also suitable at high moisture levels.
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Metal filters
1 028 SKU 0554 0641Robust metal sinter filter for humidity sensors Ø 12 mm. Screwed to the sensor. For measurements at high air speeds or high temperatures.
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Mesh filter for humidity sensors
1 260 SKU 0554 0757Protective filter (mesh) for humidity sensors with a diameter of 12 mm. Protects the sensor from dirt and damage.
Similar products
testo 6681 – moisture transmitter series for sensitive environments
For monitoring and controlling sensitive environments in process engineering contexts
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- 0...100%RH
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