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Overview of humidity measurement transmitters testo 6621, testo 6651 and testo 6681

Price

testo 6651testo 6681 testo 6621 testo 6651 Climate technology and industry:critical climate, cleanroomsIndustry:critical climate, cleanrooms, drying processes, high humidity, trace humidity, humidity in H ModelApplicationstesto 6621 testo 6681

Performance

The air conditioning humiditytransmitter: for applications in rooms or in air conditioning ducts

O

environmentetc.

testo 6621testo 6681 testo 6651 Measuring range Humidity0 to100 %RH 5 m 0 to100 %RH(no high humidity processes) –ABS and nickel-plated ABSdigital Testo (for 2PA software ortesto 400/650)External interface, adjustability Wall or duct installation 0 to100 %RH(not for high humidityprocesses), duct:-20 to+70 °C(-4 to+158 °F)±2.5 %RH(0 to90 %RH)±4 %RH(90 to100 %RH)±0.5 °C/ 0.9 °F°C, °F, %RH 0 to100 %RH(no high humidity processes) Accuracy at+25 °C (+77 °F) Humidity**up to±1,0 %RH(0to90%)±1,4 %RH(90to100%), dependent on probePt100 Class A±0,2 °C / 0,38 °F*TemperaturePt100 1/3 Class B±0,15 °C / 0,27 °F*°C/°F, %rF/%RH, °C Measurement parameters
3 3 td /°F
td °C/°F, %rF, %RH, °C
td ,°F
td , g/m ,gr/ft , g/kg,gr/lb, enthalpy, °Ctw, °Ftw, inch H
2 O, ppm(vol),% Volfor H
2 O
2 -applications: °Ctm/°Ftm Signal outputs
4 to20 mA, 2-wire (duct version only)0 to1 Volt, 4-wire 0 to5/10 Volt, 4-wire 4 to20 mA, 2-wire (not for testo 6614/6615)0/4 to20 mA, 4-wire 0 to1/5/10 Volt, 4-wire Mounting variants Wall probe testo 6611Duct probe testo 6612 Cable probe testo 6613/6614/6615/6617 -20 to+120 °CTemperature(dependent onprobe)-40 to+180 °C±1,7 %RH(0to90%)±1,9 %RH(90to100%) Wall probe testo 6601 Duct probe testo 6602/6603Cable probe testo 6604/6605 max. cable length 10 m4 to20 mA, 2-wire0/4 to20 mA, 4-wire0 to1/5/10 Volt, 4-wire Housing ABS, plastic, IP65 Metal, IP65 Interfaces digital Testo (for P2A software ortesto 400/650) digital Testo (cf. testo 6651)Profibus (optional intermediary layer) Special features 4 relays (optional)early warning system (via display orrelay collective alarm) Special probe versions for• Temperature ranges up to +180 °C (+324 °F)• Trace humidity testo 6615• High humidity testo 6614 • Self-diagnosis testo 6617 4 relays, optionalearly warning system (via display, relaycollective alarm or Profibus) *Other accuracies apply for the wall probe with 70 mm length in combination with a current output (P07):Operation: with 2 channels at 12 mA, without display illumination, relay off, additional measurement inaccuracy to above data at +25 °C (+77 °F), humidity ±2.5 %RH,temperature ±1 °C (1.8 °F) **For more deatailed explanation on the determination of the measurement uncertainty according to GUM, see p.23