Cooper Instruments & Systems DPG 100 Digital Pressure Test Gage - Manual (Page 5)

2.2.2 Low Battery Indicator
On the left side of the display, just above the minus sign, is the low battery indicator (in the shape of an arrow).
When the battery voltage is less than 5 volts, the display will be blanked and the low battery indicator will illuminate
to indicate that the batteries should be replaced. The low battery indicator can be seen when the instrument is
turned on and all segments of the display are momentarily lighted.
When the low battery indicator is illuminated, change the batteries as soon as possible. The instrument will not
function if the battery voltage falls below approximately 4 volts.
2.2.3 Decimal Point Position
The decimal point position automatically changes depending upon:
• the user selected engineering units
• the pressure range of the instrument
The decimal point position cannot be changed manually.
2.2.4 Incremental Display Step
The incremental display step is the value, which the last digit of the display will change by. This value will either be
1, 2, or 5 display counts. It automatically changes depending upon:
• the user selected engineering units
• the pressure range of the instrument
The incremental display step cannot be changed manually.
2.2.5 Pressure Port Threads
There are two types of pressure ports used, based on the operating pressure of the instrument. Male threads (for
ranges below 500 PSI) are ¼ -18 NPT. Female threads (for ranges 500 PSI and above) are 9/16-18 UNF-2B
straight thread with SAE spec J514 O-ring boss. An 0-ring is needed to seal all instruments with female threads.
Optional pressure adapters are listed in the "Accessories" section of this chapter.
2.3 Maximum Safe Overpressure
Maximum safe overpressure is the pressure that the instrument can experience occasionally without loss of
accuracy or permanent damage.
Table 1: Maximum Safe Overpressure
Pressure Range (PSI) Maximum Safe
Overpressure (PSI)
0-1=1 10
0 -5 = 5 25
0-15=15 75
0-30=30 150
0 -50 = 50 250
0-100=100 500
0-200 = 200 1000
0- 300 = 300 1200
0- 500 = 500 1500
0- 750 = 750 1500
0 -1000 = 1K 2000
0 -1500 = 1.5K 3000
0 -2000 = 2K 4000
0 -3000 = 3K 6000
0 -5000 = 5K 7500
0-7500 = 7.5K 12000
0-10000= 10K 15000
DPG 100 2 Rev Feb 2001