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How to recalibrate a Magnehelic Pressure Gauge

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Before You Begin
  • Isolate the AHU and confirm the fan has stopped rotating.
  • Be ready to open both the air-on and air-off filter doors.
  • Have a flathead screwdriver available for the zero adjustment.
  • Follow local lock-off/tag-out requirements where applicable.
Quick Overview
  • Isolate the AHU and equalise pressure across the gauge.
  • Set the needle to 0 Pa if required.
  • Confirm tubing is connected high-to-dirty side and low-to-clean side.
  • Restart the AHU and verify stable filter pressure readings.
Keep This Guide On Hand

This guide shows how to check and recalibrate a Magnehelic differential pressure gauge and verify that the pressure tubes are connected to the correct sides of the filter. It is intended to help maintenance personnel ensure accurate pressure readings.

Video guide | 4 minutes 47 Seconds | Booklet included

Download Guide

Written Guide Overview

This written summary mirrors the booklet and gives users a quick reference to the key steps show in the video.

1
 Isolate the unit and open both filter-section doors to equalise pressure across the gauge.
2
 Check whether the needle returns to 0 Pa and adjust the zero screw slowly if it does not.
3
 Verify the tubing connections so the dirty side is connected to High (+) and the clean side to Low (–)
4
 Close and secure the doors, restart the AHU, and confirm the gauge provides a stable pressure drop reading across the filter.
What this guide covers
  • Opening the filter section safely.
  • Checking the zero position on the gauge.
  • Adjusting the zero screw correctly.
  • Verifying high and low pressure tube connections.
  • Inspecting tubing for damage or restrictions.
  • Confirming stable readings after restart.

Need further assitance?

If the portal does not load, re-check the internet connection, QR scan and 18-digit reference number. If access still fails, contact ECE support and quote the unit’s reference number. You can reach our team on 01634 729 690 or sales@eceuk.com.

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