Edwards Barocel 7025, Инструкция по эксплуатации

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Page 19
W602100880_A - Operation
Note:
After zero adjustment, the gauge automatically returns to measurement mode.
The <RUN> LED flashes if:

At final pressure, the signal output is negative (< -20 mV)

The zero adjustment has failed.
<ZERO> Adjustment with ramp function
The ramp function allows to adjust the zero at a known reference pressure within the
measurement range of the gauge.
It also permits to adjust an offset of the characteristic curve in order to:

Compensate for the offset of the measurement system, or

Obtain a slightly positive zero for a 0 to 10 V AD converter.
The offset should not be more than 2% of the F.S. (+200 mV). The measurement range is more
than the upper limit if there is a higher positive offset.
The recommended procedure for adjusting the offset of a measurement system is:
1. Operate the gauge for at least 2 hours (until the signal is stable).
2. Push the <ZERO> button with a pin (maximum ø1.1 mm) and keep it depressed. The
<RUN> LED starts flashing. After 5 seconds, the zero adjustment value, starting at the
current output value, keeps continually changing (ramp) until the button is released
or until the setting limit (maximum 25% F.S.) is reached. The corresponding output
signal is delayed by about 1 second.
1. Press the pin briefly