Test Run; Positioner Readjustment - Yoshitake CT-1 Product Manual

8.3 Test run

If the product comes with accessories, it is shipped with positioner set to zero point
and the span adjusted, but it may be dropped or received impact during transportation
or installation, so before operation, be sure to have a test run.
Caution
The product operates while a test run. Be sure to conduct a test run before operation.
And, please have a test run in a pressure-free state with no fluid inside.
[Test run procedure]
(1) Connect a regulator or current generator so that the positioner receives a 4-
20mA DC pseudo input signal.
(2) With the air pressure applied to the air regulator, confirm the product operates
with its opening from 0 to 100% when the pseudo input signal of 4 to 20mA DC
(0 to 100%) is given to the positioner and changed between 0-100%. If the
opening is incorrect, readjust the positioner according to "8.4 Positioner
readjustment".

8.4 Positioner readjustment

Caution
The product operates during the positioner adjustment, so make sure that there is no fluid
inside the product, and readjust the positioner under no pressure.
【For EP-1 electropneumatic positioner】
(1) Loosen 4 screws on the cover with a cross-head screwdriver and remove the
cover. Then, readjust the zero-adjustment part and the span adjustment part.
(Fig. 10)
Cover
Screw
-13-
Zero-adjustment part
Span adjustment part
Fig.10
■ EPDT-318a ■