WIRING INSTRUCTIONS
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SCREW TERMINAL
Torque: 0.8 N·m
PIPING
MB-16
MB-08
BLOW
AIR HEADER
BLOW
MB-01
PNEUMATIC
SUPPLY
Select an appropriate pipe size for the required flow volume.
Connect a stopping valve at the pipe connection to the air
header for easy testing and maintenance.
Blow the piping before the Transducer installation in order
to remove dust in it. Use dry air containing no carbon black
or other foreign particles. To ensure reliability, use an air
filter (0.01 microns). Be sure that no water, oil or dust par-
ticles enter the transducer by way of supply air. The pneu-
matic inlet is female screwed of Rc 1/4” (1/4” NPT optional
with a fitting). Tightening torque is at the maximum of 12
N·m. Check that there is no air leak at the connection after
sealing it.
Be aware that attaching/detaching the output piping with
the input signal applied, or sudden change in the output
pressure affects outputs of other I/P Transducers. Such ef-
fects are especially great when the supply pressure piping
is of small size.
CHECKING
1) Terminal wiring: Check that all cables are correctly con-
nected according to the connection diagram.
2) Input: Check that the input signal is within 0 – 100% of
the full-scale.
3) Check output air pressure.
4) Check supply pressure.
5) Check that there is no air leak at the connections.
Note: The transducer constantly consumes some portion of
supply pressure (6 Nl/min. typical) at the nozzle of
nozzle-flapper section, where a leaking air sound may be
heard during normal operation.
ADJUSTMENT PROCEDURE
This unit is calibrated at the factory to meet the ordered
specifications, therefore you usually do not need any cali-
bration.
For matching the signal to a receiving instrument or in case
of regular calibration, adjust the output as explained in the
following.
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HOW TO CALIBRATE THE OUTPUT SIGNAL
Use a signal source and measuring instruments of sufficient
accuracy level. Turn the input signal on and warm up for
more than 10 minutes.
1) ZERO: Apply 0% input and adjust output to 0%.
2) SPAN: Apply 100% input and adjust output to 100%.
3) Check ZERO adjustment again with 0% input.
4) When ZERO value is changed, repeat the above proce-
dure 1) – 3).
MAINTENANCE
Regular calibration procedure is explained below:
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CALIBRATION
Warm up the unit for at least 10 minutes. Apply 0%, 25%,
50%, 75% and 100% input signal. Check that the output
signal for the respective input signal remains within accu-
racy described in the data sheet. When the output is out of
tolerance, recalibrate the unit according to the “ADJUST-
MENT PROCEDURE” explained earlier.
TESTING
Operation testing is available without disturbing the ac-
tual transducer input signal in following the procedure de-
scribed below:
1) Close across the terminal 3 – 4.
2) Connect the current generator’s positive (+) terminal to
the transducer’s terminal 3, the negative (–) to the termi-
nal 2.
LIGHTNING SURGE PROTECTION
M-System offers a series of lightning surge protectors for
protection against induced lightning surges. Please contact
M-System to choose appropriate models.
HVPN
5-2-55, Minamitsumori, Nishinari-ku, Osaka 557-0063 JAPAN
Phone: +81(6)6659-8201 Fax: +81(6)6659-8510 E-mail: [email protected]
EM-3440 Rev.9 P. 3 / 3
