Instruction Manual

34
tina88e1-b (2014-09)
The <ERROR> LED will continue blinking red after 8 s if
the signal output is negative (< -20 mV) when the final pres-
sure has been attained
the zero adjustment has failed.
4.4.2 <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 measuring system or
obtain a slightly positive zero for a 0 … 10 V AD converter.
The offset should not exceed 2% of the F.S. (+200 mV). At a
higher positive offset, the upper limit of the measurement range
is exceeded.
Zero adjustment using the ramp function can be
performed via
the <ZERO> button on the gauge,
the diagnostic port ( [3]),
the RS232 interface ( [2], [3]),
the Ethernet interface ( [1], [4]),
the wireless network ( [1], [4]).
Operate the gauge for at least 90 minutes under constant
ambient conditions (until the signal is stable).
Push the <ZERO> button with a pin (max. ø1.1 mm) and
keep it depressed. The <ERROR> LED starts blinking.
After 5 s, the zero adjustment value, starting at the current
output value, keeps continually changing (ramp) until the
button is released or until the setting limit (max. 25% F.S.)
is reached. The corresponding output signal is delayed by
about 1 s.