See how you can check your gauge’s calibration against itself and another gauge. Learn a simple way to test positive and negative ports against each other.
How It Works: Step-by-Step
Set Both Channels to Pressure Mode
Switch both Channel A and Channel B to measure pressure in Pascals (Pa).
Cross-Port Input Comparison
Connect a tube between the Input ports of both channels (blue and green).
Both channels should display the same pressure within 2% accuracy.
(Blue = Input A; Green = Input B)
Cross-Port Reference Comparison
Disconnect and reconnect the tube between the Reference ports (red and yellow).
Again, readings must match within 2%.
(Red = Ref A; Yellow = Ref B)
Compare Against Another Calibrated Gauge (Optional)
For added confidence, connect corresponding ports between your gauge and a known-nearby calibrated gauge.
Readings should also align within 2%.
Backed by Manufacturer Guidelines
Retrotec recommends this quick check as part of weekly or pre-test routines. It identifies gauge drift, blocked ports, or tubing issues rapidly—without needing to send the gauge for lab calibration—since most field errors aren’t calibration-related but due to tube faults or port mismatches.
Quick Checklist
| Mode | Ports | Action | Expected Outcome |
|---|---|---|---|
| Input | Blue–Green | Connect tube | Channels match within 2% |
| Ref | Red–Yellow | Connect tube | Channels match within 2% |
| Both | Gauge–Gauge | Compare same ports across two gauges | Within 2% |
If any comparison fails:
Inspect and replace tubing
Test alternate ports
Only consider factory calibration if all tubing and ports pass but results still differ
