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Testo 6621 Temperature/RH Transmitter ( Commercial HVAC ) product information
SPECIFICATIONS TESTO 6621 COMERCIAL HVAC TEMPERATURE/RH TRANSMITTER
+ Parameters Humidity
Meas. range: 0 to 100% RH (>90% RH only briefly)(not for high humidity processes)
Accuracy*:
±2.0 %RH (0 to 90 %RH),
±4 %RH (90 to 100 %RH)
Temperature dependency/coefficient: Temperature coefficient: 0.05%/K (gap of 25 °C/77 °F)
Sensor: Testo humidity sensor
Replaceability of sensor:
testo 6621 – A01/A03 (wall version): Through Testo Service
testo 6621 – A02 (duct version): Can be done by customer (s. below, Replacement sensors), subsequent 2-point adjustment required
+ Temperature
Meas. range:
testo 6621 – A01/A03 (wall version): 0 to +60 °C (+32 to +140 °F)
testo 6621 – A02 (duct version): -20 to +70 °C (-4 to +158 °F)
Accuracy: ±0,5 °C / 0,9 °F
Sensor:
Active signal output: NTC
Passive signal output: NI1000
+ Inputs and outputs Analog outputs
Number of channels: 2 channels (humidity and temperature)
Output type:
4 to 20 mA (2-wire)
0 to 1/5/10 V (4-wire)
Measuring rate: 1/s
Accuracy of analog outputs:
4 to 20 mA ±0,05 mA
0 to 1 V ±2,5 mV
0 to 5 V ±12,5 mV
0 to 10 V ±25 mV
+ Power:
Voltage supply: 20 to 30 V AC/DC
Current consumption:
Output:
testo 6621 – A01/A03 (wall version): Voltage supply [V]
testo 6621 – A02 (duct version): Current consumption [mA]
2-wire current 4 to 20 mA:
testo 6621 – A01/A03 (wall version): 20, 24, 30
testo 6621 – A02 (duct version): 20, 20, 30
+ General Housing
Material / colour: ABS/pure white (RAL 9010) or light grey
Dimensions:
testo 6621 – A01/A03 (wall version): 81 x 81 x 26 mm
testo 6621 – A02 (duct version): 81 x 81 x 42 mm see drawing for probe
Weight:
testo 6621 – A01/A03 (wall version): 80 g / 90 g (A03)
testo 6621 – A02 (duct version): 160 g
+ Display
Display: 2-line LCD (optional)
Resolution:
Humidity: 0.1 %RH
Temperature: 0.1 °C/°F
+ Operation
Parameterization: P2A software
+ Assembly
Cable screw connection:
testo 6621 – A01/A03 (wall version): None (cable routed through rear wall opening or break-out opening on bottom)
testo 6621 – A02 (duct version): 1 x M16 x 1,5
+ Other features
Protection class:
testo 6621 – A01/A03 (wall version): IP30
testo 6621 – A02 (duct version): IP65
EMC: According to EC directive 2004/108/EEC
Interfaces: 1x mini-DIN for connecting PC
Reaction time:
t90: < 15 s at 2 m/s; For calibration and adjustment, please note: The response time may be considerably higher in static air
Scaling range: -50 to 100 °C / -58 to 212 °F, 0 to 100 %RH
+ Operating conditions
Electronics temperature (housing) (with/without display):
0 to +60 °C/32 to +140 °F (A01/A03), With display: 0 to +50 °C/+32 to +122 °F; -20 to +70 °C/-4 to +158 °F (A02), With display: 0 to +50 °C/+32 to +122 °F
Storage temperature: -40 to +70 °C (-40 to +176 °F)
Measuring medium: Air in air-conditioning systems or air-conditioned rooms
Introduction Testo 6621 Temperature and RH Transmitter ( Comercial HVAC )
Temperature and humidity measurement transmitter testo 6621 – features
- 2 analog outputs (temperature/humidity), optionally 1 analog output humidity and temperature passive
- Highly accurate and long-term stable Testo humidity sensor
- P2A software for parameterization, adjustment and analysis saves time and costs in commissioning
- Optimum calibration concept by adjustment of the entire signal chain (1-point, 2-point and analog adjustment)
- 2-line LCD display optional
Features
– Transmitter with 2 analog outputs (temperature/humidity)
– High-precision Testo humidity sensor with long-term stability
– Optional 2-line LCD display
– P2A software for parameterization, adjustment and analysis
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