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VNR 23M

VNR 23M
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GENERAL CHARACTERISTICS This control unit with double measuring channels was designed as low cost interface for conductive level probes and is used to control liquids that have a minimum electrical conductivity of 8 ^S. The system is based on measurement of the conductivity of the liquid to be controlled and works with low potential and with alternating currents, in order to avoid the incrustation of the electrodes and / or perforation of the tank normally caused by the use of direct currents, which cause a galvanic action on materials. The contact of the electrode with the liquid under control determines the actuation of a relay inside the control unit. The presence of two measurement channels simultaneously allows to realize systems of control, metering, and safety. • Adjustable sensitivity and delay. • 2 measuring channels • Microprocessor technology • DIN rail mounting Signal amplifier TERMINAL FUNCTION Power supply Power consumption Input signal Power supply to probes N. 2 channels Output relay Sensitivity Operation delay Adjustments Operating temperature Housing Mounting Electrical connection 24 Vac 50/60 Hz On request 230 Vac 10 VA From conductive probes 15 Vac Power supply 24 Vac 50/60 Hz Tank ground / ground electrode Minimum level electrode Maximum level electrode Trimmers under front plate -20° +50° C DIN rail 17 poles terminal board N. 2 SPDT Simultaneous action N. 1 SPDT Ch2 TYPICAL WIRING cf CONTROL AND ADJUSTMENT Control: • Disconnect the electrodes leads from the terminal board (Ch1 -terminals 5 and 6 ) (Ch2 - terminals 12 and 13 ). • Short circuit terminals 5 and 6 of the terminal board, in these conditions, the Ch1relays must switch on. • Short circuit terminals 12 and 13 of the terminal board, in these conditions, the Ch2 relays must switch on. Sensitivity and delay adjustment: • The unit is supplied with a factory setting of 60 ^S. • Submerge the electrodes in the liquid under control, turn the trimmer (Sensitivity) under the front plate to obtain the switching of the relays. • The operation delay can be adjusted with the trimmer (Delay) also located under the front plate. Type Number of channels Sensitivity Power supply We reserve the right to change the data without notice Level Flow rressun Temperature-Electronic www. valco. it

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