Ametek PMT 40, Manual

Page: 22 / 49

User Manual
17
Tighten link screws.
b. Now restore black pointer to approximately
original position by loosening scale shape
adjust screw ½ turn and moving the
segment. When pointer is back to original
position, lock scale shape screw.
7. Replace dial and apply Po to element. Adjust
black pointer to read correctly. Apply Pc and
Pu. Note errors.
8. If error at Pu is twice error at Pc make only
range adjustments (4 and 5). If not, make
only scale shape adjustments (6 and 7) until
the error at Pu is twice the error at Pc. Then
make range adjustments per 4 and 5.
Figure 16
Tracking of red pointer to black is
accomplished as follows (Fig. 17):
1. Reconnect control link to element and turn on
supply air.
If instrument is a proportional only type set
proportional band at 10% and proceed with
steps 2-5.
If instrument is a propor reset
type, trap mid-span output pressure in the
reset chamber as described in TUNING
PROPOR RESET CONTROLLER.
Set band at 10% and proceed with steps 2-5.
BELL CRANK
GASKET
BELL CRANK
DIAPHRAGM LINK ASSY.
ANGLE
H. P. STOP
L. P. HOUSING
L. P. SIDE
L. P. STOP
RANGE SPRING
H. P. HOUSING
H. P. SIDE
STOP SCREW
Figure 21