testo 6621 Humidity transmitter

A broad variety of the testo 6621 transmitter is available. Depending on the application in a room or in a duct, the corresponding designs can be selected. A display and an external probe are available as options. You can choose between the housing colours grey and white. The testo 6621 is persuasive in technical terms thanks to the patented humidity sensors that guarantee the highest accuracy. The sensors and the analog outputs can be adjusted, analyzed and parameterized via the external interface using the P2A software. The testo 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. Highly accurate testo humidity sensor with long-term stability (±2.0% RH). Optional 2-line LCD display. P2A software for parameterization, adjustment and analysis, saves time and costs in commissioning and maintenance. Optimum calibration concept thanks to adjustment of the entire signal chain (1-point, 2-point and analog adjustment). Adjustment without dismantling the transmitter 2 analog outputs (humidity/temperature), option of 1 passive humidity and temperature analog output.Parameters: Humidity: 6621 – A01/A03 (wall version): 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: Through Testo Service, testo 6621 – A02 (duct version): Can be done by customer (s. below, Replacement sensors), subsequent 2-point adjustment required. Temperature: testo 6621 – A01/A03 (wall version): Meas. range: 0 to +60°C (+32 to +140°F). Accuracy* ±2.0 %RH (0 to 90 %RH), ±4 %RH (90 to 100 %RH), Accuracy: ±0.5°C / 0.9°F. Sensor: Active signal output: NTC Passive signal output: NI1000. testo 6621 – A02 (duct version): Meas. range: -20 to +70°C (-4 to +158°F). Inputs and outputs: Analog outputs: testo 6621 – A01/A03 (wall version): 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 General Housing: testo 6621 – A01/A03 (wall version): Material / colour: ABS/ pure white (RAL 9010) or light grey. Weight: 80 g / 90 g (A03). Dimensions: 81 x 81 x 26 mm. testo 6621 – A02 (duct version): Dimensions: 81 x 81 x 42 mm see drawing for probe. Weight: 160 g. Display: 2-line LCD (optional). Resolution Humidity: 0.1 %RH Temperature: 0.1°C/°F. Operation: Parameterization: P2A software. Assembly: testo 6621 – A01/A03 (wall version)Cable screw connection: 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: testo 6621 – A01/A03 (wall version)Protection class: IP30. EMC: According to EC directive 2004/108/EEC. Interfaces: 1x mini-DIN for connecting reference measuring instrument/PC. Reaction time: t90: < 15 s at 2 m/s; When calibrating, make note of adjustment: The response time may be considerably higher in stagnant air. Scaling range: -50 to 100°C / -58 to 212°F, -50 to 100 %RH. testo 6621 – A02 (duct version)Protection class: IP65. 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 airconditioned rooms.