Crystal 30 Series Digital Pressure Calibrator - Manual (Page 5)

Functions  3
30 Series Operation Manual
Units buttons and mA / % button
Pressing the
(
units
)
button updates the display to the next unit selection. The mA button scrolls through direct milliamps, % 4-20, and %10-50.
The pressure calibrator will display the following combinations of pressure and/or milliamps:
Top Line
Bottom Line
If LP, HP, or mA are not being displayed, press the respective button and the parameter will appear. If the parameter is already on screen, pressing the cor-
responding button will cause it to cycle to the next scale or units for that button.
On/Off button
This function is obvious. What is not obvious is that all the settings are saved when you turn the unit off. When you turn the unit back on it will be set to the
same combinations of ranges and scales. Even the zero or tare value stays the same.
Battery Replacement
The battery is located on top of the unit, under the sliding cover. Batteries must only be changed in a non-hazardous area! The best way to change the
battery is to first turn off the unit, then replace the battery. All settings will be retained if battery replacement is done this way. If the unit is stored for a long
time, the battery should be removed, to avoid potential damage from battery leakage. If the battery has been removed for storage or the battery was discon-
nected while the unit was on, the unit will automatically reset 5 to 10 seconds after reconnecting the battery.
Reset
If, for some reason the unit needs to be reset, remove the battery. Either wait one minute, or short circuit the battery snap connections with any metal object.
If the reset is successful the unit will begin operating when the battery is reconnected without pressing the
(
on/off
)
button.
Measuring Vacuum
All sensors in 30 Series calibrators can be used to measure vacuum, but only ranges rated at 300 PSI (2000 kPa) or less have actually been certified. (Refer to
your calibration certificate.) When measuring pressure less than ambient conditions the display will show a minus (-) sign in the left most position. On some
scales (like kilograms per square centimeter which has 4 decimal places of resolution), this will cause the display to shift right one digit. Resolution won’t be
lost, but part of the range icon will disappear until positive pressure is restored.
!
CAUTION: 30 Series calibrators are not recommended for continuous use a high vacuum.