measuring range -30 to +30 °Ctd 2 switch outputs as output for monitoring limit long term stable and condenstation-proof Testo humidity sensor (polymer sensor) guarantees highest process security P2A software for parameterization, adjustment and analysissaves time and costs in commissioning Low-budget solution for monitoring refrigeration Compact design allows easy integratiion into a refrigeration dryer or pneumatic machine The testo 6721 is a budget dewpoint guard with switch contacts. Continuously monitoring a "simple" compressed air refrigeration dryer was often not economically viable in the past. This security gap is now closed with the testo 6721. Whether integrated into the refrigeration dryer or pneumatic machine, or retrofitted by the customer, the testo 6721 avoids damage caused by excessive humidity in compressed air. Since the testo 6721 has only aswitch output, it is primarily suited to monitoring limit values. measurement values cannot be output via an analog signal. The budget monitoring function is particularly suitable at machine level, in order to protect a system, e. g. compressed air refrigeration dryers, from humidity damage. This avoids costly repair work necessary by high humidity, leading to icing, corrosion, material adhesion, "water hammer" (mechanical damage due to accelerated water deposits), and much more.

Technical data testo 6721 Switch outputs 2 X potential-free, switch voltage 24 optional wiring as NC contact or NO Free selection within measurement range through Order code, or set using Measurement rate Resolution switch output Further outputs Voltage supply Current consumption Mini DIN interface (serial) for Subject to change without notice.

Technical drawings Connection plan 1 Root switch contact 1 2 Closer switch contact 1 3 Opener switch contact 1 5 Opener switch contact 2 6 Closer switch contact 2 9 Root switch contact 2 Subject to change without notice.

FXX Unit dewpoint / min. max. limit value / hysteresis (pre-setting) The following options can be specified for the testo 6721 : FXX Unit dewpoint / min. max. limit value / hysteresis (pre-setting) F01 Dewpoint °Ctd / LV 1 / LV2 / hysteresis F02 Dewpoint °Ftd / LV 1 / LV2 / hysteresis Order code for testo 6721 with the following options: - Lower limit value at 5 °Ctd - Upper limit value at 14 °Ctd Limit values: Without specification, default limit values are +5 °Ctd / +10 °Ctd, at 1 Kelvin hysteresis (for unit °F: 45 °Ftd / 55 °Ftd / 2 °F hysteresis). They can be set to customer requirements...