Testo 6651 – Humidity transmitter for critical
climate applications
Not all measurement problems can be solved with „simple“ transmitters. The testo 6651 meets special challenges.
When combined with the probe series testo 660x, the testo 6651 becomes the first choice in demanding air conditioning technology as well as in many other applications.
- Optimum adjustment concept thanks to adjustability of the entire signal chain incl. analog adjustment
- Ethernet, relay and analog outputs allow optimum integration into individual automation systems
- Self-monitoring and early warning guarantee high system availability
- Calculation and presentation of the humidity parameters relative humidity absolute humidity and dewpoint.
- P2A software for parameterization, adjustment and analysis saves time and costs in commissioning and maintenance
- Display with multi-language display
- High-quality plastic housing
TESTO 6651 Humidity Transmitter
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| Humidity | |
| Units | Relative humidity %RH , °Ctd, °Ftd, g/m³ |
| Meas. range | 0 to 100 %HR |
| Temperature | Temperature in °C / °F |
| Meas. range | -30°C to +120°C |
| Inputs and outputs | |
| Quantity | 2 channels |
| Output type | 0/4 to 20 mA (2-wire/4-wire) 0 to 1/5/10 V (4-wire) |
| Measuring rate | 1/s |
| Galvanic isolation | Galvanic isolation of the output signals (2-wire and 4-wire), isolation of supply from outputs (4-wire) |
| Resolution | 12 bit |
| Accuracy of the analog outputs |
0/4 … 20 mA / ±0.03 mA 0 … 1 V / ±1.5 mV 0 … 5 V / ±7.5 mV 0 … 10 V / ±15 mV |
| Max. load | 500 Ω at 24 VAC/DC |
| Ethernet | Optional: module can be fitted as intermediary layer |
| Relays | Optional: 4 relays (free allocation to measurement channels or as collective alarm with operating menu/P2A software), up to 250 V AC/DC / 3 A (NO/NC) |
| Other outputs | Mini DIN for Testo P2A parameterization software |
| Supply | 2-wire: 24 VDC ±10 % 4-wire: 20 to 30 VAC/DC |
| Current consumption | Max. 300 mA |
| Protection class | IP65 |
| Directive électricité | 2004/108/EG |
| Dimensions | 122 x 162 x 77 mm (sans sonde) |
- Overview
-
Testo 6651 – Humidity transmitter for critical
climate applicationsNot all measurement problems can be solved with „simple“ transmitters. The testo 6651 meets special challenges.
When combined with the probe series testo 660x, the testo 6651 becomes the first choice in demanding air conditioning technology as well as in many other applications.- Optimum adjustment concept thanks to adjustability of the entire signal chain incl. analog adjustment
- Ethernet, relay and analog outputs allow optimum integration into individual automation systems
- Self-monitoring and early warning guarantee high system availability
- Calculation and presentation of the humidity parameters relative humidity absolute humidity and dewpoint.
- P2A software for parameterization, adjustment and analysis saves time and costs in commissioning and maintenance
- Display with multi-language display
- High-quality plastic housing
- Technical specification
-
TESTO 6651 Humidity Transmitter
Humidity Units Relative humidity %RH , °Ctd, °Ftd, g/m³ Meas. range 0 to 100 %HR Temperature Temperature in °C / °F Meas. range -30°C to +120°C Inputs and outputs Quantity 2 channels Output type 0/4 to 20 mA (2-wire/4-wire)
0 to 1/5/10 V (4-wire)Measuring rate 1/s Galvanic isolation Galvanic isolation of the output signals (2-wire and 4-wire), isolation of supply from outputs (4-wire) Resolution 12 bit Accuracy of the analog
outputs0/4 … 20 mA / ±0.03 mA
0 … 1 V / ±1.5 mV
0 … 5 V / ±7.5 mV
0 … 10 V / ±15 mVMax. load 500 Ω at 24 VAC/DC Ethernet Optional: module can be fitted as intermediary layer Relays Optional: 4 relays (free allocation to measurement channels or as collective alarm with operating menu/P2A software), up to 250 V AC/DC / 3 A (NO/NC) Other outputs Mini DIN for Testo P2A parameterization
softwareSupply 2-wire: 24 VDC ±10 %
4-wire: 20 to 30 VAC/DCCurrent consumption Max. 300 mA Protection class IP65 Directive électricité 2004/108/EG Dimensions 122 x 162 x 77 mm (sans sonde) - Download
