Siemens MS Series, Instruction Manual, Page: 87 / 130

SITRANS P, MS series
87
C79000-B5674-C40-04
On-site Operation and Display
Adjusting the start of scale and full scale
If the output current is not set but continuously adjusted, a DC ammeter is required.
In addition the currents to be adjusted must be calculated mathematically (Chapter
3.1.2, p. 83). An adjustment can be made for the start of scale, full scale or both val-
ues one after the other.
Preparations:
1. Clean the housing so that no dirt can penetrate.
2. Unscrew the front cover (Figure 2, p. 75), remove the digital indicator (if fitted).
See also Chapter 3.1, p. 81).
3. Connect the DC ammeter to the test plug (Figure 22, p. 107).
• Adjust start of scale
WARNING
Only certified, zum Messumformer passende, ammeters may be used in intrinsi-
cally safe circuits.
In areas with a potential explosion hazard, the housing cover of transmitters with
the type of protection "explosion-proof" may only be unscrewed when the device is
not energized. If transmitters are to be used as category 1 / 2 equipment, please
observe the EC examination certificates bzw. die für Ihr Land gültige Prüfbeschei-
nigung.
Inputs, hold times Explanations
(1) Apply reference pressure to the
transmitter
As assumed by the calculation formula
(2) Press [Z/
↓
], hold, then [S/
↑
],
immediately, release both but-
tons
Activate start of scale adjustment Press
(3) [Z/
↓
] or [S/
↑
] until the desired output current is set on the DC
ammeter which corresponds to the new start of
scale
(4) Press both buttons simulta-
neously and wait 2 s or auto-
matically after 2 min.
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