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A low AC voltage is applied between the probe electrode and the tank wall (or reference electrode in case of insulated tank). When the liquid comes in contact with the electrode tip, a conductive path is established between the sense electrode and the tank wall / reference electrode. This current is sensed, amplified and made to operate a relay whose contacts in turn can be used for annunciation / control.

Mechanical Specifications

Electrical Specifications


Cast aluminium, weatherproof Stoving enamel painted suitable for back panel / wall mounting

Cable Entries

3 Nos. of 1/2″ BSP


1 1/2″ BSP screwed / Flanged 2″ ANSI, 10 mm thick

Others (as per size and rating specification)

Probe Type

Rod Probes

Rope Probes


S6: SS-316

S4: SS 304

SL: SS 316 L


PT – PTFE (Total Teflon)

HD –Hast Alloy C

PC –PTFE Coated (Anti-corrosive)

MS: MS (Electroplated)


110 or 230 V AC (15 to +10%) 50 Hz (as specified in the order)

Relay Output

One Relay / Two sets / Three Sets of potential-free change over contacts rated at 6A 230 V AC, 50Hz for non-inductive load

Power Consumption

5 VA approx.

Fail-safe Setting

High and Low Field selectable

Response Time

0.5 second

Switching Delay

0.5 to 20 seconds for probe covered and uncovered condition (on request) High or Low Field selectable

Maximum Sensitivity

25μ Siemens


12 V AC (across probe & tank wall / grounding electrode)


< 4 mA (between probe & tank wall / grounding electrode through liquid)

Applications Specifications

Operating Temperature 20°C to +60°C

Pressure 10 Bars

Switching Indication

2 LED’s

Red: Alarm, Green: Normal