Ametek PMT 40, Manual

Page: 24 / 49

User Manual
19
BOURDON PRESSURE ELEMENT (Fig. 18)
To remove –
remove two screws on back of case
holding process connection block. Unhook long
control link at its lower end. This is the back link,
closest to the chassis. Remove shoulder screw
to set point link. Remove three element mounting
screws. The upper screw is reached through the
dial. Reassemble in reverse order.
To clean –
if pointer action is sticky, movement
pivots and teeth are probably coated with gummy
oil. This can be removed by soaking entire
element in suitable solvent. Caution: Remove dial
before immersing.
To disassemble – if movement is damaged
(usually broken or twisted hairspring or worn
teeth) it is necessary to disassemble element.
Remove dial by loosening two dial screws.
Remove movement by unhooking measurement
link and loosening two movement mounting
screws. If movement can be repaired, do not
loosen range adjustment screws as indicator and
tracking calibration will be retained thus requiring
no calibration. Reassemble in reverse order.
To calibrate –
use a test gauge of known
accuracy to compare with black pointer readings.
A dead weight tester is satisfactory if oil in
element is not objectionable. See CALIBRATION
AND TRACKING INSTRUCTIONS.
Figure 18
MEASUREMENT
LINK
INDICATING
MOVEMENT
RED POINTER
BLACK POINTER
ELEMENT
MOUNTING SCREW (3)
DIAL
DIAL SCREW
(2)
SHOULDER
SCREW
SET POINT LINK
CONTROL LINK
TRACKING
ADJUST SCREW
RANGE
ADJUST SCREW
BOURDON