Operation subject to legal metrological control ("Custody transfer")Commissioning Instructions for PTB gas approval Proline Promass
18
Hauser
5.5
Zero point adjustment
All Promass measuring devices are calibrated under reference operating conditions with state-of-
the-art technology. The zero point calculated in this way is printed on the nameplate
However, it can also be shown at any time on the display using the key sequence BASIC
FUNCTION
SENSOR DATA
CONFIGURATION
ZERO POINT (6803).
See also the manual entitled "Description of Device Functions" BA00110D Promass 84 HART or
BA00130D Promass 84 Modbus RS485.
In the case of the Promass 84, it is recommended that a zero point adjustment be carried out using
a (test) gas during calibration and testing of the measurement technology. The resulting value must
be documented in the report accompanying the device or in the acceptance report.
Performing the zero point adjustment
1.
Operate the system until operating conditions have settled.
This usually takes approx. 5 minutes at maximum flow rates.
2.
Stop the flow (v = 0 m/s).
3.
Check the shutoff valves for leaks.
4.
Check that the operating pressure is correct.
5.
Using the local display, select the ZEROPOINT ADJUSTMENT function in the function matrix:
BASIC FUNCTIONS
PROCESS PARAMETER
ADJUSTMENT
ZERO POINT
ADJUSTMENT
6.
When you press
O
or
S
you are automatically prompted to enter the access code if the
function matrix is still disabled. Enter the code (factory setting = 84).
7.
Use
O
or
S
to select START and confirm with
F
.
Select YES at the prompt and press
F
again to confirm.
Zero point adjustment now starts.
– The message "ZEROPOINT ADJUST RUNNING" appears on the display for 30 to 60 seconds
while adjustment is in progress.
– If the flow in the pipe exceeds 0.1 m/s, the following error message appears on the display:
"ZERO ADJUST NOT POSSIBLE".
– When the zero point adjustment completes, the "ZERO ADJUST." function reappears on the
display.
8.
Back to the HOME position:
– Press and hold down the Esc keys (
X
) for longer than three seconds, or repeatedly press
and release these keys.
