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VNR 23

Product catalog summary

General Characteristics
The VNR2300 control unit is a cost-effective interface designed for conductive level probes, suitable for controlling liquids with a minimum electrical conductivity of 10 µS. It operates using low potential and alternating currents to prevent electrode incrustation and tank perforation, which are common with direct currents. The unit's relay is activated upon electrode contact with the liquid, enabling control of alarms or actuators. Multiple probes and control units can be connected for dosage and safety systems.

Technical Data

Power Supply: 24 Vac 50/60 Hz (230 Vac on request)
Power Consumption: 5 VA
Input Signal: From conductive probes
Power Supply to Probes: 22 Vac
Output Relay: 2 x SPDT 250Vac 5A
Sensitivity Range: 10 - 250 µS (Factory setting: 60 µS)
Sensitivity Adjustment: Side trimmer
Operating Temperature: -20° to +50° C
Housing: ABS
Degree of Protection: IP 40
Mounting: DIN rail
Dimensions: 60 x 100 x 45 mm
Electrical Connection: 11 poles terminal board

Control and Adjustment
Control: Disconnect electrode leads from terminals 5 and 6, then short circuit these terminals to switch on the relays.
Sensitivity Adjustment: With a factory setting of 60 µS, submerge electrodes in the liquid and adjust the side trimmer to switch the relays.

Nomenclature
The VNR2300 model includes adjustable sensitivity from 10 µS, double relay output, and DIN rail mounting. Terminal functions include power supply, tank ground, MIN/MAX level probes, and relay connections.

Catalog excerpts

Signal amplifier GENERAL CHACTERISTICS The VNR2300 control unit was designed as low cost interface for conductive level probes. These electronic units are used to control liquids that have a minimum electrical conductivity of 10 pS. 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 and it is possible to drive any alarm system and / or actuator. By using multiple probes and multiple control units, appropriately connected, a system of dosage and safety can be realized. • Adjustable sensitivity from 10pS. • Double relay output. • DIN rail mounting. Power supply Power consumption Input signal Power supply to probes Output relay Sensitivity range Sensitivity adjustment Operating temperature Housing Degree of protection Mounting Dimensions (mm) Electrical connection 24 Vac 50/60 Hz 230 Vac on request 5 VA From conductive probes 22 Vac 2 x SPDT 250Vac 5A 10 - 250 pS Factory setting 60pS Side trimmer -20° +50° C ABS IP 40 DIN rail 60 x 100 x 45 11 poles terminal board SENSITIVITY ADJUSTEMENT TYPICAL WIRING MIN./MAX. LEVEL ALARM Tank ground MIN. level probe MAX. level probe N.O. N.C. COM. N.O. N.C. COM. CONTROL AND ADJUSTMENT Control. Disconnect the electrodes leads from the terminal board (terminals 5 and 6). Short circuit terminals 5 and 6 of the terminal board, in these conditions, the relays must switch on. Sensitivity adjustment. The unit is supplied with a factory setting of 60 pS. Submerge the electrodes in the liquid under control, turn the side trimmer to obtain the switching of the relays. Type Tab.1 Sensitivity Tab.1 Power supply We reserve the right to change the data without notice -Level- flow -ffBSSUIB Temperature-Bedim www.valco.it

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*Prices are pre-tax. They exclude delivery charges and customs duties and do not include additional charges for installation or activation options. Prices are indicative only and may vary by country, with changes to the cost of raw materials and exchange rates.

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