Cla-Val X117D - Manual (Page 2)

CLA-VAL
Copyright Cla-Val 2012 Printed in USA Specifications subject to change without notice.
P.O. Box 1325 • Newport Beach, CA 92659-0325 • Phone: 949-722-4800 • Fax: 949-548-5441 • E-mail: [email protected] • Website cla-val.com
©
N-X117D (R-8/2012)
Refer to calibration equipment and adjust transmitter potentiometer
marked “NULL” until the meter reads 4 mA. A clockwise turn
increases output. Use care in adjusting the potentiometer while
turning the screwdriver.
5. For the most accurate calibration it is necessary to open valve
fully. CAUTION: This will either allow a high flow rate through the
valve, or the downstream pressure will quickly increase to the
inlet pressure. In some cases, this can be very harmful. Where
this is the case, and there are no block valves in the system to
protect the downstream piping, it should be realized that steps
should be taken to remedy this situation before proceeding further.
Normally, block valves are to be used to protect downstream piping
while the valve is in the open position. Close downstream block
valve. Vent cover chamber to atmosphere. Slightly open inlet
block valve. Allow valve to open while fluid is vented from cover
chamber. When flow stops valve is in the fully open position.
Note: continuous leakage from cover chamber could mean additional
troubleshooting of the main valve or pilot system must be done.
6. With valve in fully open position, inspect position of wire rope
and nut coupler. (See Step 3). Adjust if necessary.
Refer to calibration equipment (see Step 4) and adjust potentiometer
marked “SPAN” until the meter reads 20 mA. A clockwise turn
increases output. Use care in adjusting the potentiometer while
turning the screwdriver.
7. There is some interplay between:
1.) the “span” and “null” settings,
2.) the 4 to 20 mA signal and,
3.) the actual valve open and closed positions.
Repeat steps 4-6 above. Cycle valve from open to closed posi-
tions and check settings as necessary to achieve desired valve
position signal accuracy.
8. Remove all calibration equipment and attach permanent
wiring. Recheck wiring and output signals at remote location.
See Wiring section. Reinstall two cover screws on housing.
Recheck and tighten all fasteners. Bleed air from main valve
cover through small bleed screw and washer located on one
wrench flat of adapter.
MAINTENANCE
The X117D is constructed of durable materials which normally
requiring no lubrication or periodic maintenance. The two ‘O’ rings
(2) (p/n 00951E) in the adapter (5) that seal against the stainless
steel actuating stem (1) will need replacement if signs of leakage
at the stem occur.
M
+
Meter
12 to
35 VDC
–
+
Red
Black
_
GAP
Coupler gap is set with valve in fully closed position. This establishes the minimum mechanical position for 4 mA output.
0 10 15 20 35 30 25
0
200
400
800
600
1000
1200
OPERATING ZONE
1150 OHMS
12V
SUPPLY VOLTAGE, V
MAX. LOAD, R (OHMS)
ADJUSTMENT: Zero and span adjustments allow setting the 4 mA position (valve closed) within 0% to 30% of total transmitter range
and setting the 20 mA position (valve fully open) within 80% to 100% of total transmitter range.
X117D Adjustment Parameters Operating Zone