Comark C9551 User Manual download pdf (Page 12)

4. OTHER FUNCTIONS

4.1 Battery Low

Low battery is indicated by the symbol BAT on the

display. Replace the battery as soon as possible after

this symbol appears.

4.2 Over Range Pressure

If the pressure measured (either positive or negative

pressure) exceeds the full scale of the instrument, the

display will show – – – –

If this occurs the pressure must be reduced to avoid

damage to the sensor in the instrument.

4.3 Over 9999 Reading Indication

If the numeric value for display exceeds ±9999, with

or without a decimal point, the display will blink and

suppress the top (5th) digit, whilst continuing with

correct values of the lower 4 digits.

4.4 Differential or Gauge Measurement

C9500 series instruments can be used in either a gauge

or differential pressure measurement system.

Gauge:

For positive gauge measurements the negative

(-ve) port should be left open to atmospheric pressure

and the positive (+ve) port used to input the pressure.

For negative gauge measurements the positive (+ve)

port should be left open and the ‘vacuum’ applied to

the negative (-ve) port. Please note that in this case

the reading displayed will be positive even though a

vacuum is being measured.

Differential:

When measuring differential pressures, ensure that the

most positive (+ve) pressure is applied to the positive

(+ve) port.

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Comark C9551 User Manual Page 12