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Instruction 55-9002 17

Gas Pup

Figure 14. Pressure Proving a System

using the Delta Pressure Mode

To piping system

being tested

PRESSURE

FITTING

HI%

LO%

PPM

RANGE

NATURAL GAS

READING

Attach a hand pump or air compressor

and pump up piping system to desired

pressure (not to exceed 99 psig) with

instrument in its high-pressure mode

SERVICE LINE

PRESSURE TESTING KIT

P/N 55-0072

3. Attach a hand pump or air compressor to the tire-valve portion of the

Testing Kit’s Tee, and then pump up the system to the desired pres-

sure (not to exceed 99 psig).

4. Press the key until the letter “d” appears in the RANGE window,

indicating that the Gas Pup is now operating in its delta pressure

mode. The value “0.0” should now appear in the READING window,

indicating that the pressure being measured equals the high-pressure

reading just taken.

Note: The delta and low-pressure modes are activated in the

same manner. The difference being that the low-pressure mode

is entered while the instrument’s pressure port is open to the

atmosphere, while the delta mode is entered with pressure

already applied to the instrument.

5. Monitor the value in the READING window. The value displayed

indicates the difference in pressure (in the range of ±9.9 psig) between

the current reading and the initial pressure measurement. Positive

pressure readings, probably due to a rise in temperature, are indi-

cated by a steady display, while negative readings that are due to

leaks are indicated by a flashing display. Note that an out-of-range

pressure condition is identified by two dashes “–.–” appearing in the

READING window.

Operation

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