Checking Span; Zero Adjustment (Versions With 0 To 20 Ma Input Signal) - Samson 611 Mounting And Operating Instructions

Operation
Example: set it to 4 mA for 4 to 20 mA
range = 0.2 to 1 bar. The output signal
of the pressure gauge should now indi-
cate 0.2 bar.
6. If this is not the case, readjust the zero
point accordingly with the ZERO potenti-
ometer.
6.1.2

Checking span

1. First check zero, if necessary (see sec-
tion 6.1.1).
2. Set the input signal to 20 mA (upper
range value) using a suitable ammeter.
Example: the output signal at the pres-
sure gauge should now indicate 1.0 bar
for a 4 to 20 mA range = 0.2 to 1.0 bar.
3. If this is not the case, readjust the span
accordingly with the SPAN potentiome-
ter.
Terminals
Zero and span
adjusters
Switch to switch off
electronics
Fig. 17: Zero and span correction
36
ZERO
SPAN
OFF
ON
4. As the adjustment of zero and span influ-
ence each other, recheck both values and
correct them, if necessary.
6.2 Zero adjustment (versions
with 0 to 20 mA input
signal)
If the device does not have a potentiometer
for zero, the zero point can only be adjusted
mechanically at the zero point adjuster (1.1).
Î Remove the front cover.
Î Insert a screwdriver through the hole in
the cover of the Type 6112 i/p Module
(see Fig. 16).
EB 6116 EN