CONDUCTIVE PROBE LEVEL CONTROL RELAY

An attractive modern designed conductive probe type level control relay in a din rail mounted modular style housing of 1.5 modules width (27mm). The MOD-W-1 is a transformer based conductive probe level control relay and is hence available in dedicated AC voltages only. The sensitivity is potentiometer adjustable 2-100 Kohms, also a potentiometer is fitted to adjust a delay on tripping timer 0.1-10 secs, useful to delay threshold tripping due to fluid movement in tanks. An eight way function switch is provided (designated A to H) to switch between “pump up” and “pump down” modes along with a relay proving function “permanent on” or “permanent off”, the switch will also determine how the adjustable time delay will function. The function positions are as follows:-

A: Pump up, delay on energisation & de-energisation

B: Pump down, delay on energisation & de-energisation

C: Pump up, delay on energisation

D: Pump down, delay on energisation

E: Pump up, delay on de-energisation

F: Pump down, delay on de-energisation

G: Relay proving, permanent on

H: Relay proving, permanent off

Regulation of two levels - pump down mode: The relay energises when the high level probe is reached and deenergises when the level falls below the low level probe.

Regulation of two levels - pump up mode: The relay deenergises when the high level probe is reached and energises when the level falls below the low level probe.

Regulation of one level - pump down mode selected: Connect the maximum and the common terminals together. In this case a single probe only is used and the relay operates when the probe is immersed.

Note: Selection of pump up mode reverses the relay.

Relay proving feature: The front selector switch can be used to “prove” the relay either permanently ON or permanently OFF.

Common probe: A common reference is always required, if the vessel or tank is conductive the chassis of the tank or vessel will suffice. If the tank or vessel is not conductive a third probe is required to act as the common reference.

Supply & Measuring

Supply voltage:
24VAC, 110VAC, 230VAC
24VDC (unisolated)

Supply voltage tolerance: ±15%

Max power consumption: 3VA

Insulation: 2.5KV 50Hz impulse

Sensitivity range: Adjustable 2-100 KOhms

Delay on tripping: Adjustable 1-10secs

Probe supply:
20VAC
5VDC on DC Version

DC auxiliary supply units are possible but the probe supply is an unisolated 5VDC with a consequential risk of a possible electrolysis reaction, especially in solutions with a high mineral or contaminant content.

Max probe current: 2mA

Relay outputs:

Output contacts: SPCO 8Amps/250V AC1

Max breaking capacity: 2000VA

Mechanical life: 30 Million ops

Electrical life: 200K ops at max rated load

General

Operating temperature: -20°C to +65°C

Storage temperature: -20°C to +65°C

Max cable size: 2.5mm

CE marked: Yes

In accordance with:
EN61000-6-1: 2007
EN61000-6-3: 2007
EN61010-1: 2002

Housing material: Polycarbonate, Auto extinguishable to UL 94 V-0

TYPE

MOD-W1 (Din rail SPCO)

COIL VOLTAGE

230VAC
110VAC
24VAC
24VDC

DC auxiliary supply units are possible but the probe supply is an unisolated 5VDC with a consequential risk of a possible electrolysis reaction, especially in solutions with a high mineral or contaminant content.