Instruction Manual
D200158X012
4194S Controllers
July 2018
25
4. To install the replacement scale, bend the lower part of the slot slightly so that the scale slides downward over the
set point adjustment and under the process indicator.
5. Install and tighten the four screws on the scale.
6. A slight zero adjustment (see figure 3-1) may be necessary so that the process indicator aligns with the 0 mark on
the scale. This procedure is described in the Zero and Span Adjustment portion of the Calibration procedures.
Figure 4-3. Changing the Scale
DEFLECT LOWER PORTION OF THE SLOT
W3440
AND LIFT THE SCALE UP AND OFF
W3492
Relay
1. Loosen the two captive screws that hold the relay (key 50) in place.
2. Tip the relay slightly toward the case to clear the output pressure gauge, and lift out the relay.
and does not require an O‐ring.
5. Tighten the two screws that hold the relay in place.
Figure 4-4. Relay Construction
CLEAN‐OUT
WIRE
RELAY
TAB
EXHAUST PORT
(NO O‐RING
USED)
O‐RINGS
RELAY
MOUNTING
SCREWS
W3441