Normal Operation - Ecom Instruments CP 440 Instruction Manual

4. Normal Operation

Turning the backlight on and off: Press the ENTER button.
Zeroing the display: Press and hold the ZERO button.
MAX/MIN: The CP 440 stores minimum and maximum pressure values
in memory. Pressing the MAX/MIN button once will display the minimum
pressure from memory. Pressing the MAX/MIN button again will display
the maximum pressure from memory. After about 2 seconds, the gauge
returns to normal (live display) operation. To clear the MAX/MIN memory
registers, press and hold the MAX/MIN button for 2 or more seconds until
"CLr" is displayed.
The analog bar graph at the bottom of the display indicates the applied
pressure level relative to the full range of the gauge. Keep in mind that if a
TARE value has been programmed into the gauge, the displayed pressure
will not reflect the true pressure applied.
Changing the Batteries
Grasp the face ring on the CP 440, turn it approximately ⁄4 turn coun-
terclockwise and remove. The face of the gauge can now be lifted to
expose the battery holder. Install three AA batteries noting proper polarity.
Reassemble the case making certain that the face is properly oriented.
If you purchased the optional 24 Volt powered version, the terminals for
power input are located on the rear of the gauge. To apply power simply
connect 24 volts to the rear terminal block taking care to observe proper
polarity.
WARNING
Gauges ordered with the external power option will not come
with batteries installed. Batteries MUST NOT be installed when
operating on external power.
Battery life
Battery life is about 500 hours (60 days) of continuous use with the
backlight off. With intermittent use, batteries could last a year or more.
There is a low battery icon in the upper left of the display. It will appear
when battery level is low. Replace batteries per recommendations found
in the specifications section of this manual.
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