Crystal DTG - Manual (Page 3)

C R Y S T A L
engineering corporation
PN: 2646 REV B, 8/2002
Firmware Release 1.05
Page 3 of 8
Units button
Pressing this button causes the DTG to select the next unit of pressure measurement. There are
up to 9 units available. See Specifications on page 5 for the list of scales.
Peak detection
The DTG continuously records maximum and minimum applied pressure, and cannot be
disabled. To view the maximum pressure value press the PEAK button. Press the PEAK button
again to view the minimum recorded pressure. Pressing the PEAK button once more returns the
display to the current applied pressure reading.
Resetting recorded peak values
When displaying either high or low recorded pressure, the zero button is used to reset the peak
high and low values to the currently displayed pressure. This will not affect the zero or tare
value. If you need to rezero the gauge, the gauge must be in normal pressure mode.
Automatic shut-off
Normally, the DTG will turn off automatically after 20 minutes of operation without a key
depression. This can be defeated however, when turning the DTG on. Pressing the ON/OFF
and ZERO buttons simultaneously will prevent the DTG from automatically turning off. The DTG
will briefly display the words “No Auto Off” to indicate that it will not turn off.
This procedure is required each time the DTG is turned on, if you want to defeat the auto-
shutoff.
Low battery indication
A lighted battery icon is the first indication of a low battery. The DTG will continue to operate
accurately while the icon is lit. When the batteries are exhausted, the letters “batt” will appear
across the display and no further pressure measurements will be possible until the batteries are
replaced.
Battery replacement
The DTG uses 3 AA batteries. Alkaline batteries are recommended, but not required if the
gauge will only be operated in warm environments. Most alkaline batteries will operate down to
–10°C or colder.
Figure 1: Remove Trim Ring
Remove the trim ring on the front of the DTG (Figure 1) by
rotating it counter-clockwise. Then remove the four #6
screws from the back of the DTG as shown in Figure 2.
Carefully separate the front of the DTG from the housing.
Be careful to not put stress on the cable between the
sensor and the circuit cards. When replacing the batteries
be sure to install them in the indicated orientation.
Figure 2: Four Access Screws