Igema Multifunctional system LW Water Level control

Application and function

Low water limitation + discontinuous control (with EL913); only discontinuous control (with EL912) for processes with limited construction supervision. Water level limiter available for the following conductivity: 0.5-10,000 μS / cm

2-point water level controller DLR1/DHR1

Igema Multifunctional system LW Water Level control

Application and function

This is, together with IGEMA conductivity probes, a two-point water level controller plus low level alarm (DLR1) or high level alarm (DHR1), to be used in steam boilers or in tanks with conductive liquids.

The product meets EU Directive 2014/658/EU (PED).

Applied rules: corresponding DIN EN standards.

Function DLR1/DHR1

The indicator lamp “U_B“ shows that the power supply is on.

• Two-point control (pump on-off) by two probes of different length “Pump on” if both probes are out of water, “pump off” if both probes are immersed.
• Feed control with one probe and one (external) time relay. Only one probe (rod) is needed for pump control. “Pump on” if the probe is out of water and at the same time start of an external time relay. After an adjusted time, the time relay switches “pump off”.
• Outlet control (flow-off) by two probes of different length “Valve open” when both probes are immersed, “valve closed” when both probes are out of water.

Outlet control: special version as DLR1-A/DHR1-A

Level alarms:

Low level alarm (DLR1)

When the probe is immersed, the relay is energised and the alarm contacts are closed. No alarm (LED “NW”) should be indicated. If the low level probe is out of water, the relay is de-energised and the low level alarm contact opens. The red indicator lamp “NW” lights.

High level alarm (DHR1)

When the probe is out of water, the relay is energised and the alarm contacts are closed. No alarm (LED “HW”) should be indicated. If the low level probe is immersed, the relay is de-energised and the low level alarm contact opens. The red indicator lamp “HW” lights.

Technical basic equipment

• DLR1/DHR1 is delivered in a plastic plug-in housing for installation in control panels
• Fixation on standard rail 35 mm according to DIN EN 50022 or directly screwed to chassis plate

Dowload Datasheet: 2-point water level controller DLR1&DHR1

Multiple level probe type EL913

Application and function

• The level probe type EL913 serves as primary element for the following controllers
• LMC1  : Low water level limiter
• DHR1  : 2-point water level controller with HWL-alarm
• DLR1   : 2-point water level controller with LWL-alarm
• DS1     : LWL and HWL signaling

Technical basic equipment

Three probe rods

Technical data

Addition

• If shut-off valves are mounted between the process connection of the add-on-housing and the boiler supports, an electric locking system (end switch) has to be installed.
• A drain valve is to be mounted to the add-on-housing.