Fisher 3570C - Page 5

3570 Series
5
RANGE SPRING
(SPAN ADJUSTMENT)
CYLINDER
BOTTOM
PRESSURE
Figure 2. Typical Locatiion of T ype 3570 Positioner Parts and Adjustments
W4025*/IL
W4027*/IL
CLEAN-OUT
PLUNGER
HORIZONTAL
RELAY
CYLINDER
(TOP
CONNECTION)
(O-RING,
KEY 33)
CYLINDER
TOP PRESSURE
BIAS SPRING SEAT
(ZERO ADJUSTMENT)
BIAS SPRING SEAT
(ZERO ADJUSTMENT)
INSTRUMENT
PRESSURE
VENT CONNECTION
3/8-INCH NPT
NOTES:
ON SOME CONSTRUCTIONS, TWO NOZZLES AND ADJUSTMENTS ARE REQUIRED.
CYLINDER
(BOTTOM CONNECTION)
(1/4 INCH NPT)
INSTRUMENT
CONECTION
(INPUT SIGNAL)
(1/4-INCH NPT)
SUPPLY
CONECTION
(NOT SHOWN)
(1/4-INCH NPT)
VERTICAL
RELAY
BELLOWS
RELAY NOZZLE
(OUTPUT PRESSURE
ADJUSTMENT )
BELLOWS
POSTS
   
1
1
Figure 3. Bias and Range Springs for Zero
and Span Adjustments
AJ7270-C
1H8907-C
1J2233-C
B2402/IL
Figure 4. Diagnostic Test Connections
12B8044-A
A6112/IL