Humidity transmitter Highly accurate testo humidity sensor with long- P2A software for parameterization, adjustment and analysis, saves time and costs in commissioning 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 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. • Industrial and commercial buildings, e.g. • Offices and administrational buildings • Sales areas and exhibition hall School buildings, hotels, clinics etc.

Humidity transmitter Technical data * The determination of the measurement uncertainty takes place according to GUM (Guide to the Expression of Uncertainty in Measurement): In the determination, the accuracy of the measuring Instrument (hysteresis, linearity, reproduceablllty), the uncertainty contribution of the test site as well as the uncertainty of the adjustment site/works calibration are taken Into account. For this purpose, k=2 of the extension factor, the usual value In measurement technology, Is used as a basis, corresponding to a trust level of 95%. Subject to change without notice.

Humidity transmitter Technical drawings (wall version) (wall version) Connection plan (duct version) Subject to change without notice.

Humidity transmitter The following options can be specified for the testo 6621 : Order code for testo 6621 transmitter with - Duct version outputs (humidity/temperature) - Without display - Relative humidity parameter (% RH) - Neutral housing, pure white, without testo - Metal wire protection cap A01 Wall version (not with B01, B05) A03 Wall version with external probes for 4 to 20 mA analog output (only with B01) Housing colour light grey, ind. Testo logo Neutral housing, white, without Testo logo Neutral housing, white, ind. Testo logo 2 analog outputs (humidity/temperature) Humidity: analog...