The bellow type body halves provide the pressure containment function. They also clamp the sensing element and over-pressure assembly between the halves, isolating the high side and low side pressures of the system. The high side body half also provides a mount for the torque tube assembly and the gauge front assembly.

• Over-Range Protection, High over Low and Low over High
• Micro Adjust Pointer
• Wide Selection of DP Ranges & Scales
• Bellows or Multiple Diaphragm Sensing Element

The bellow type gauge sensing element is exposed to the differential pressure and deflects in response to the differential pressure. This assembly incorporates a bidirectional relief valve which provides over-pressure protection in both directions. When over-pressured from the high side, the valve is opened by a mechanical stop as the sensing element deflects to its maximum travel. When over-pressured from the low side, the spring-loaded valve opens when the differential pressure exceeds its maximum rating.

• Over-Range Protection, High over Low and Low over High
• Micro Adjust Pointer
• Wide Selection of DP Ranges & Scales
• Bellows or Multiple Diaphragm Sensing Element

The opening of the valve in either direction equalizes the pressure and protects the unit. A range spring is provided to adjust the spring rate of the system to suit the various differential pressure ranges of the instrument.

• Drop in replacement for Barton and Prime Measurements
• Over-Range Protection, High over Low and Low over High
• Micro adjust pointer
• DP Ranges from 0-10″ H2O to 0-69.9″ H2O

• Drop in replacement for Barton and Prime Measurements
• Over-Range Protection, High over Low and Low over High
• Micro adjust pointer
• DP Ranges from 0-70″ H2O to 0-800″ H2O
• Tamper Proof, All adjustments require removal of bezel for access.
• Snap acting micro switch for alarm (optional)
• In house Oxygen Cleaning (optional)
• Private labeling (optional)
• Black ink on white dial or White ink on back dial