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| | Type | testo 6621 - A01 (wall version) | testo 6621 - A02 (duct version) | |
| | Sensor | | |
| | Output parameters | Relative humidity %RH as well as temperature °C or °F (two separate analog outputs) | |
| | Measurement ranges (rel. humidity/temperature) | 0 to 100 %RH (not for high humidity processes) 0 to +60 °C(32 to+140 °F) | 0 to 100 %RH (not for high humidity processes) -20 to+70 °C (-4 to+158 °F) | |
| | Measurement medium, Pressure range | Air in air conditioning units or rooms, max. 1 bar positive pressure | |
| | Measurement inaccuracy/Humidity | ±2.5% (0 to 90 %RH), ±4% (90 to 100 %RH) Temperature coefficient: 0.05% / K (difference of 25 °C) | ±2.5% (0 to 90 %RH), ±4% (90 to 100 %RH) Temperature coefficient: 0.05% / K (difference of 25 °C) | |
| | Measurement inaccuracy/Temperature | ±0.5 °C/ 0.9 °F | ±0.5 °C/ 0.9 °F | |
| | Replaceability of humidity sensor | By Testo Service Department | Can be replaced by customer (see below for spare sensor), 2-point adjustment subsequently required | |
| | Analog outputs (two channels each) | Current output: 4 to 20 mA ±0.05 mA as 2-wire version (not for wall version) or voltage output: 0 to 1 VDC ±2.5 mV; 0 to 5 VDC ±12.5 mV; 0 to 10 V ±25 mV as 4-wire version (please order accordingly, no on-site adaptation) | |
| | Display, resolution and measurement rate | 2 line LCD (optional) humidity resolution: 0.1 %RH, temperature resolution: 0.1 °C/ 0.1 °F, measurement rate 1/s | |
| | Power supply | At voltage output: 20 to 30 VDC / VAC | At voltage output: 20 to 30 VDC / VAC | |
| | Housing material + Dimensions | ABS, 81 x 81 x 26 mm | ABS, 81 x 81 x 42 mm, refer to diagram for probe | |
| | Temperature application range (housing) | -20 to +70 °C (-4 to+158 °F) With display: 0 to +50 °C (32 to +122 °F) | -20 to+70 °C (-4 to+158 °F) With display: 0 to +50 °C (32 to +122 °F) | |
| | Storage temperature | -40 to +80 °C (-40 to +176 °F) | -40 to +80 °C (-40 to +176 °F) | |
| | Cable screw connections | None (cable is through back wall opening or break-out opening on underside | 1 x M16 x 1.5 | |
| | Weight, IP protection | 80 g, IP 30 | 160 g, IP 65 | |
| | EMC | In accordance with EU guideline 89/336/EEC | In accordance with EU guideline 89/336/EEC | |
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