Ceraphant PTP31B, PTP33B Description of device parameters
Endress+Hauser 61
Navigation EF → GTZ
Description The pressure resulting from the orientation of the device can be corrected here.
The pressure difference between zero (set point) and the measured pressure need not be
known.
Prerequisite An offset is possible (parallel shifting of the sensor characteristic) to correct the
orientation and any zero point drift. The set value of the parameter is subtracted from the
"raw measured value". The requirement to be able to perform a zero point shift without
changing the span is met with the offset function.
Maximum offset value = ± 20 % of the sensor nominal range.
If an offset value is entered that shifts the span beyond the physical limits of the sensor,
the value is admitted but a warning message is generated and shown on the display. The
warning message only disappears when the span is within the sensor limits, taking the
offset value currently configured into consideration.
The sensor can
• be operated in a physically unfavorable range, i.e. outside its specifications, or
• be operated by making appropriate corrections to the offset or span.
Raw measured value – (manual offset) = display value (measured value)
Example 1 • Measured value = 2.2 mbar (0.033 psi)
• You use the "GTZ" parameter to correct the measured value with the value, e.g.
2.2 mbar (0.033 psi). This means that you are assigning the value 0 mbar (0 psi) to the
pressure present.
• Measured value (after pos. zero adjust) = 0 mbar (0 psi)
• The current value is also corrected.
• If necessary, check and correct switch points and span settings.
Example 2 Sensor measuring range: –0.4 to +0.4 bar (–6 to +6 psi) (SP1 = 0.4 bar (6 psi); STU =
0.4 bar (6 psi))
• Measured value = 0.08 bar (1.2 psi)
• You use the "GTZ" parameter to correct the measured value with the value, e.g.
0.08 bar (1.2 psi). This means that you are assigning the value 0 mbar (0 psi) to the
pressure present.
• Measured value (after pos. zero adjust) = 0 mbar (0 psi)
• The current value is also corrected.
• Warnings C431 or C432 appear because the value 0 bar (0 psi) was assigned to the real
value of 0.08 bar (1.2 psi) present and the sensor measuring range was thus exceeded
by ± 20%.
SP1 and STU values must be readjusted downwards by 0.08 bar (1.2 psi).
Factory setting 0.0
TAU damping
Navigation EF → TAU
Description The damping affects the speed at which the measured value reacts to changes in pressure.
Damping causes a change in the current value in the "HLD" (HOLD) error current mode.
Input range 0.0 to 999.9 seconds in increments of 0.1 seconds
Factory setting 2 seconds or according to order specifications
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