Resistance Sensors, dual probe National Controls Corporation

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Resistance Sensors (Dual Probe)
DLA, DLB Series

This family of Level Controls provides high and low level sensing with Pump Up or Pump Down capabilities. They are packaged in a standard octal plug-in housing. The probe and sensing circuits are isolated from line voltage via a transformer. The probe is driven with an AC signal to prevent plating. The output is an electro-mechanical relay rated at 10 amps.

Model DLA (Pump Down), the output relay is activated when the upper probe detects the presence of liquid and it remains activated until the lower probe detects the absence of liquid. Model DLB (Pump Up), the output relay is activated when the lower probe detects the absence of liquid and it remains activated until the upper probe detects the liquid.

If the tank is non-conductive, a third (common) probe must be installed at a level where it will always be submerged.


File #E61377 Solid State Sensing Circuitry Dual Probe Level Detection User Adjustable Sensing Resistance	Rugged Octal Plug-in Housing Heavy Duty Internal Construction Made in U.S.A.

On/Off Resistance Sensing:: DLA Models - Probe resistance below set point activates relay.; DLB Models - Probe resistance above set point activates relay.
Sensing Voltage: 18 VAC, maximum RMS
Sensing Current: 2.0 mA, maximum RMS
Sensitivity Adjustment: 1K to 250K ohms ± 10%, factory set at 100k ohms ± 10% Input Operating Voltage: 24, 120 or 230 VAC ± 10% Power Consumption: 1.2 VA max. Frequency: 50/60 Hz Output Type: Relay contacts, S.P.D.T. (1 form C), Silver Cad. Oxide Material Rating: 10 amp. resistive at 120, 240 VAC; 100 mA at 5 VDC minimum load current Life: Mechanical - 5,000,000 cycles Electrical -100,000 minimum at full load

Protection

Isolation: 1500 VAC between probe and other terminals

Mechanical
Termination: 8-pin octal plug
Mounting:
Socket Mount -Part Number MS0-0008P-012

Environmental
Operating Temperature