Q: What is a direct drive gauge?
A: Direct drive refers to the bourdon tube (elastic element) being attached directly to the pointer, with no amplification method (gears, etc.) present. The Perma-Cal® triple layer helical-wound bourdon tube directly attaches to the pointer shaft, and due to its configuration, traverses the full arc of the scale. This provides a very linear reading gauge that maintains its accuracy because no gears or linkages, which tend to wear and fail, are used.

Q: What is the burst pressure of a Perma-Cal® gauge?
A: 500% of full scale pressure or 25,000 psi, which ever is lower.

Q: How much overpressure can a Perma-Cal® gauge withstand?
A: Perma-Cal® gauges can withstand 150% of the full scale pressure (50% overpressure) or 125% of the full scale pressure on ranges of 6000 psi and higher, with no effect on calibration.

Q: What are the wetted materials?
A: The standard wetted materials (materials exposed to the process fluid) are stainless steel, Inconel and silver braze. Nickel braze may be substituted by adding a '-N' to the end of the part number.

Q: Can Perma-Cal® provide 0-100 inches of water column?
A: No. The limits of the direct drive technology prevent us from providing a 270° arc on any pressure lower than 30 psi or its equivalent. The 0-15 psi gauge we offer has a 135° dial arc.

Q: Can I get a dial with my logo on it?
A: Yes. Custom dials are available. We can provide to your specifications with multi-color options available for logos, special lettering, or colored bands on the dial to identify areas of use or danger.

Q: What is dampening (in the dial trim choices)?
A: Perma-Cal® dampens pointer flutter by a unique technique. Dampening is recommended on all gauges except those used where ambient temperatures will fall below -15°F (-25C). Our method of dampening, and the direct drive technology, eliminate the need for liquid fill.

Q: What is the price and delivery of a particular part number?
A: Please contact your local distributor or the factory directly. Your distributor may have the gauge you want in stock. Orders from the factory, on average, run 2-4 weeks, depending upon the part number and quantity. Expedited delivery of factory orders may be available for a nominal fee.