2
Thermowell Dim. A Dim B. Thread C Hex. D
85031-A1 4 - 3/16 (106mm) 7/8 (22mm) 3/4-14 N PT 1-1/8
85031-A2 4 - 31/64 (114mm) 1.10 (28mm) 1 - 11 -1/2NPT 1-3/8
3rd &
4th
DIGIT
BODY MATERIAL
01 Aluminum
19 Stainless Steel
2nd
DIGIT
INSTALLATION ACCESSORIES
0
Stainless St. bushing with 3/4" - 14 NPT thread
1
Stainless Steel thermowell and Beryllium
Copper sleeve with 3/4" - 14 NPT thread.
Rating: 5,000 psi max. @ 400° F.
2
High Pressure Stainless Steel Thermowell and
Beryllium Copper sleeve with 1" – 11-1/2 NPT
thread. Rating: 10,000 psi Max. @ 400° F.
3
Replacement temperature sensor without
installation accessories
SUFFIX
LETTER
TYPE OF ACTION
A
Direct Acting - Vents on increase
B
Reverse Acting - Closes vent on increase
Reset Differential: 6 to 16° F. (3.3 to 9° C.) non-adjustable
Repeatability:............................................... ±5° F. (2.8° C.)
Mounting Dimensions: .................................... See Figure 1
Approximate Shipping Weight:
Without Thermowell .............................. 1-1/4 lbs. (.6 Kg)
With 85031-A1 Thermowell Kit.............. 1-1/2 lbs. (.7 Kg)
With 85031-A2 Thermowell Kit.............. 2-1/8 lbs. (1 Kg)
Models Available:
85026-X0XXX
INSTALLATION
NOTE: Handle instrument with care to avoid damage to
sensing element.
Bulb Location - Correct location is the most important
detail of sensor installation. The bulb should be installed at
a point of true representative temperature in good
circulation with maximum insertion depth. If a
thermometer is used, its sensing element should be
installed adjacent to the bulb.
Mounting: The 85026-Series temperature sensor may be
mounted in any position, but vertical (upright) is
recommended. Vent openings should have fittings installed
turned down. Care should be taken to prevent foreign
matter from entering the valve ports during installation.
If the sensor is out of doors or in any way exposed to
water during cleaning, etc., it should be mounted in a
position which will prevent water entry into the valve
housing. Water trapped in the housing will impair
operation and could freeze during winter months. The 1/8"
- 27 NPT connections can be used for piped vent operation
if gas is used as the operating medium.
Unless ordered with a thermowell, each sensor model is
equipped with a bushing with 3/4" - 14 NPT external
threads. CAUTION: Do NOT use pipe wrench, channel
locks, etc., on valve body when tightening into bushing or
thermowell.
To mount sensor, loosen jam nut (see Fig. 5, detail 9)
and remove bushing. Install bushing in desired location.
Place sensor in bushing, positioning it with the desired port
orientation. Tighten jam nut.
Connections (See Figure 1): The sensor has two 1 / 8"
- 27 NPT connections used for control pressure (port "IN")
and piped vent operation (port "V"). Control pressure must
be provided through a .032" (.8 mm) diameter or smaller
orifice.
CAUTION: The piped vent from the sensor cannot be used
as a supply source for any other equipment. If sensor vent
is restricted in this manner, faulty operation will result.
NOTE: If St. St. thermowell is required, specify No. 85031-A1 or
A2 Thermowell Kit.
WITH
BUSHING
WITH
THERMOWELL