Start-Up; Tuning Zero And Span - Samson System 6000 Mounting And Operating Instructions

7 Start-up

The work described in this section is only to
be performed by personnel qualified for the
assignment accordingly.
Before start-up or putting the device back in-
to service, make sure the following condi-
tions are met:
− The converter is properly mounted ac-
cording to the instructions.
− The pneumatic and electrical connections
have been properly performed according
to the instructions.
− The prevailing conditions in the
converter's environment meet the
converter's technical specifications. See
specifications on on the nameplate
('Markings on the device' section) and in
the technical data ('Design and principle
of operation' section).
Supply air
Î Open the supply air line:
– At least 0.4 bar (6 psi) above the
upper signal pressure range value
– Max. 5.4 bar (80 psi) without supply
pressure regulator

7.1 Tuning zero and span

The device converts the input signal propor-
tionally into the output signal. The signal
ranges are specified on the nameplate (see
the 'Markings on the device' section).
It may be necessary to correct zero and pos-
sibly span after vibration, shocks or jolts
during transport have occurred, when the
EB 6126 EN
mounting position is not horizontal or when
the screw plug does not face upwards. Zero
and span can be corrected by approx. 10 %
using the electronics. To do this, proceed as
follows:
Example
The output signal 0.2 to 1 bar is to be
assigned to an input signal of 4 to 20 mA.
1. Unscrew the enclosure cover to access
the ZERO and SPAN adjusters on the cir-
cuit board (see Fig. 7-1).
Zero:
2. Connect a pressure gauge (minimum
accuracy class 1) to the converter output.
3. Set the supply air to at least 0.4 bar
above the upper output signal range
value and apply it to the device.
4. Deactivate the switch-off electronics in
the 4 to 20 mA version at the switch (5).
5. Set the input signal to the lower range
value (4 mA) using a suitable ammeter.
The output signal at the test pressure
gauge should indicate a lower range
value of 0.2 bar.
If this is not the case, readjust the zero point
accordingly with the ZERO adjuster.
Span:
6. Set the input signal to 20 mA using a
suitable ammeter. The output signal at
the test pressure gauge should indicate
the upper range value of 1.0 bar. If an-
other value is indicated, readjust the
span accordingly with the SPAN adjuster.
Start-up
7-1