MP Filtri DEH Series, Operator'S Manual

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4. Product Installation and Maintenance Instructions
USER INSTRUCTIONS FOR DEH ELECTRICAL INDICATORS
4.1 Correct Usage
The electrical indicator is specifically designed for use with MP Filtri hydraulic pressure and in line filters, the indicator
monitors differential pressure across the filter element. The indicators are made up of a certificated switch assembly in
a type approved enclosure with a pressure connection that acts on a piston and spring assembly to operate a switch, the
movement of this piston is governed by the deferential pressure across the element. The indicators should only ever be
used with in the parameters detailed in this manual, the indicator should match or be greater than the system operating
pressure.
4.2 Installation Instructions
Warning - Prior to installation the filter must be depressurised.
1. Identify the pressure rating that is etched on to the body of the indicator.
2. Ensure that the maximum system working pressure does not exceed that of the indicator operating pressure.
3. Static build up may cause sparks between the components therefore it is crucial that the connections (pipes/hoses) are
earthed separately and connected to the filter housing using electrostatic dissipative components only.
4. Before removing the indicator, to prevent a potentially hazardous situation, the depressurised system and filter must not
be subject to potentially volatile atmospheres in the form of gases vapors or mist present.
5. Ensure that the seals and connecting threads are free from debris / contamination and that they are in a good working
condition. Clean or replace seals that are defective or contaminated.
6. Inspect the filter housing and indicator thread for any signs of damage or contamination prior to installation, any signs
of damage should be rectified prior to assembly.
7. Wetting the seals of the indicator with the system fluid will not only help the installation of the indicator into the cavity
but it will also help reduce the risk of seal damage during the assembly process.
8. To prevent damage to the filter body or indicator housing threads ensure that the indicator screws freely into the housing
by hand, Only once the indicator is seated should a spanner be used to achieve the final installation torque.
Indicator Pressure Rating Torque Rating
420 bar 100 N∙m+10 N∙m
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Operators Guide