Wiring Pressure Switch

cmj78 · Mar 22, 2013

I am about to to install a filter in the field complete with a pressure switch that will alarm when filter blocked. I am only able to find a switch with 110Vac rating that has the correct spec's that I require, but PLC I is looking for 24Vdc. Any suggestions on most practical way to wire up this switch?

Steve Bailey · Mar 22, 2013

What is happening "under the hood" of the switch? If it is simply a contact opening or closing at the pressure setting, then a switch rated for 110 VAC will be perfectly happy switching 24 VDC.

danw · Mar 22, 2013

Are you sure your switch is a "differential pressure switch" with 2 ports; one for upstream pressure, one for downstream pressure?

A switch rating with a higher voltage rating should be OK at a lower voltage service, especially when the switch is used for signalling the alarm state to a PLC input, which is light load.

BobB · Mar 23, 2013

There are plenty of 24VDC loop powered pressure switches available. try fineteck
.

cmj78 · Mar 23, 2013

This is the filter that is on order...

http://www.normanfilters.com/catalo...hure Form E 01-05 low res 114136 r4 REV5.pdf

Thanks all for the feedback..

rbduck1 · Mar 23, 2013

If you require 24v input to the PLC and buying another switch is not an option, using the 110v out of the pressure switch to power a simple 110v cube relay. using a 24 v source through a normally open contact to the PLC should give you the 24 volts you require.

If I'm misunderstanding and the switch is a contact rated at 110volts, just send the 24 volts though the switch to the PLC.

dogleg43 · Mar 23, 2013

rbduck1 said:
If you require 24v input to the PLC and buying another switch is not an option, using the 110v out of the pressure switch to power a simple 110v cube relay. using a 24 v source through a normally open contact to the PLC should give you the 24 volts you require.

If I'm misunderstanding and the switch is a contact rated at 110volts, just send the 24 volts though the switch to the PLC.

I agree with the above quote.

More than likely the PS has dry contacts and 110V is the MAX voltage they are rated for.

Lancie1 · Mar 24, 2013

There is no need to guess. You too can read the pertinent Norman Tee-Type Filter Specifications. I AssUme that the "filter in the field complete with a pressure switch" is really talking about the optional Electrical Switch mentioned below:

OPTIONAL ACCESSORIES
Norman Tee-Type filters have a number of optional accessories in stock to modify our standard housings to meet your specific application requirements:

Visual Indicator:

Signals when the element needs changing. Reduces maintenance costs caused by premature element change-out.

Electrical Switch:
Similar to visual indicator, above, but with a microswitch (normally open) and standard conduit connection. Used to actuate warning light, buzzer, etc., to signal element clogging.

Bypass Relief Valve:
Internal valve relieves pressure during flow surges or cold startup. Recommended with low-collapse elements.

Pressure Taps:
Gauge ports on the inlet and outlet of the filter for external differential pressure sensing devices. Bowl Drain: Allows liquid to be drained from the bowl to facilitate element change-out.

Wiring Pressure Switch

cmj78

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