The max differential pressure you can measure is the max line pressure the unit can see. This is independent of the range code A through D you select.
For example:
- the Model 231GMS2 has a max differential pressure of 100PSID, so the max line pressure is 100PSI.
- The Model 231GMS1 has a max differential pressure of 50PSID, so the max line pressure is 50PSI
- If you select range code D (5PSI) on an MS1, the max line pressure is still the max differential pressure of 50PSI.