Both gages are capable of measurements above and below atmospheric as well as differential pressure measurements. Construction - Mark II air filter gages are economically priced, compact and available in both stationary and portable configurations. Portable stand is standard on Model 40, available as optional A-612 stand for Model 25. Moderate overpressures are accommodated by an overflow tank incorporated in the Model 25. Greater protection is provided by float operated overflow traps in the Model 40.
Scales are lithograph printed on aluminum and epoxy coated.
Installation - For normal stationary installations, simply mount the gage on any vertical surface with the two mounting screws provided. A built-in spirit level simplifies leveling before mounting screws are tightened. Fill the reservoir, adjust fluid level to zero, connect the tubing, and the gage is ready for operation. Bottle of indicating fluid, red and green pointer flags and complete instructions. The Model 25 includes 8' of flexible double column plastic tubing.