Emerson Spence T61 Series User manual
www.SpenceValve.com
Spence T61 Series Pneumatic
Temperature Controller
▲ WARNING
Failure to follow these instructions or
to properly install and maintain this
equipment could result in an explosion,
fire and/or chemical contamination
causing property damage and personal
injury or death.
Emerson temperature controller must
be installed, operated and maintained
in accordance with federal, state and
local codes, rules and regulations
and Emerson Process Management
Regulator Technologies, Inc.
(Emerson) instructions.
If the temperature controller vents gas
or a leak develops in the system, service
to the unit may be required. Failure
to correct trouble could result in a
hazardous condition.
Installation, operation and maintenance
procedures performed by unqualified
personnel may result in improper
adjustment and unsafe operation.
Either condition may result in
equipment damage or personal injury.
Only a qualified person shall install
or service the T61 Series Pneumatic
Temperature Controllers.
Introduction
Scope of the Manual
This manual provides instructions for installation,
maintenance and parts information for the T61 Series
pneumatic temperature controllers.
Product Description
The T61 Series Temperature Controller is ideal for
wide ranging, fast changing loads on instantaneous
heaters and other difficult process applications. The
cascade principle, normally used only on instrument
type regulators, is the basis for this design.
T61 Series, used with a properly selected A Series
Pilot or Control Valve, continuously adjusts a
pressure regulator to the required heater pressure.
This action, coupled with the fast response of a
bimetallic thermostat, gives exceptional results.
Added convenience and economy results from the
wide (200°F / 93°C) adjustable range and the low air
consumption (0.35 cfm / 0.59 m3/h). These controllers
have adjustable proportional band as well as over
temperature protection.
Type T61: For applications where air control signal
decreases as process temperature increases.
Figure 1. T61 Series Pneumatic Temperature Controller
Instruction Manual
VCIMD-14960
November 2021
T61 Series
Viton®is a mark owned by E.I. du Pont de Nemours and Co.
Specications
The Specications section gives some general specications for the T61 Series pneumatic temperature controller.
The nameplates give detailed information for a specic controller as built in the factory.
Available Configurations(1)
Type T61: Reverse Acting
Maximum Air Supply
32 psi / 2.21 bar
Maximum Signal Pressure
2 psi / 0.14 bar below supply
Maximum Inlet Pressure(2)
250 psi / 17.2 bar
Maximum Inlet Temperature(2)
400°F / 204°C
Temperature Ranges(2)
Type T61: 50 to 250°F / 10 to 121°C
Mounting
1/2 NPT
Air Connections
1/8 NPT
Air Consumption
Normal: 0.35 SCFM / 0.59 m3/hr
Maximum: 0.70 SCFM / 1.19 m3/hr
Proportional Band Adjustable
1/4 to 2 psi per 1°F / 0.02 to 0.14 bar per 17.2°C
Construction Materials
Body: Bronze
Seal: Viton®
Spool: Brass
Seat: Stainless steel
Spring: Stainless steel
Approximate Weight
2-3/4 lbs / 0.68 kg
1. Reverse Acting is when air control signal decreases as process temperature increases. Direct Acting is when air control signal increases as process temperature increases.
2. The pressure/temperature limits in this Instruction Manual or any applicable standard limitation should not be exceeded.
Principle of Operation
When Used with Regulator
The regulator is operated by its initial steam pressure.
It is normally closed, being held so by initial pressure
on the disc and by an internal main spring. The
pressure pilot is actuated by means of an air signal
applied to its diaphragm. This signal is received from
the temperature pilot as a result of the temperature
bulb sensing a drop in temperature from the
control setting.
When steam is turned on, it flows through the pressure
pilot (Figure 3) to No. 8B tee. Bleedport No. 4A
restricts the flow, builds pressure under the diaphragm
and opens the main valve. Restriction No. 5A steadies
the operation of the regulator.
Steam flowing to the heater develops a rising delivery
pressure which feeds back through the control pipe
to the pressure pilot diaphragm. As this pressure
approached a balance with the air pressure signal
supplied by the temperature pilot, the pressure pilot
throttles. This, in turn, allows the main valve to assume
a position to maintain the set temperature.
As the temperature at the outlet of the heater
increases, it causes the T61 Series controller to
reduce the loading pressure and this, in turn, will
cause the pressure regulator to modulate the steam
flow to the heater.
When Used with Pneumatic
Control Valve
The T61 Series controller sends a proportional air
signal from 0 psi / 0 bar to a maximum of 30 psi /
2.07 bar (not greater than 2 psi / 0.14 bar less than the
supplied pressure) within a 10 degree span. The pilot
will increase signal as the temperature falls, which will
either open or close the control valve, depending upon
actuator configuration.
2
T61 Series
INITIAL PRESSURE
ANGLE VALVE
GATE
VALVE
STEAM
TRAP
QUICK VENT
AIR VALVE
AND VACUUM
BREAKER
INSTANTANEOUS HEATER
F AND T
STEAM
TRAP
CONDENSATE
STRAINER
CHECK
VALVE
FROM
CIRCULATING PUMP
DRAIN
CHECK
VALVE
PRESSURE
RELIEF VALVE
COLD WATER
SUPPLY
TYPE T61
TEMPERATURE
PILOT
HOT WATER
SERVICE
SAFETY VALVE
GATE
VALVE
GATE
VALVE
CONTROL
PIPE
STRAINER
TYPE EAT61
TEMPERATURE
REGULATOR
Figure 2. T61 Series Typical Installation
Installation
▲ WARNING
Personal injury or system damage
may result if this controller is installed,
without appropriate overpressure
protection, where service conditions
could exceed the limits given in
the Specifications section and/or
controller nameplate.
Additionally, physical damage to the
controller may result in personal injury
or property damage due to escaping of
accumulated gas. To avoid such injury
and damage, install the controller in a
safe location.
All pressure equipment should be
installed in a non-seismic area;
should not be exposed to fire; and
should be protected from thunderbolt
(lightning) strikes.
△ CAUTION
The piping system must be
adequately designed and supported
to prevent extraordinary loads to the
pressure equipment.
Ensure to blow out all lines before
making final connections.
Planning
1. Locate the regulator in a horizontal pipe. Provide
a trap ahead of the regulator to prevent water
hammer and erratic operation.
2. Use a strainer to avoid damaging effects of scale
and dirt in pipelines to protect the regulator.
3. Provide a three valve bypass to facilitate
inspection of the regulator without
interrupting service.
3
T61 Series
Main Valve
1. Flush the piping system thoroughly to clear it of
welding beads, scale, sand, etc.
2. Mount the main valve with diaphragm chamber
down and arrow on body pointing in the direction
of flow.
3. Mount screwed end valves in unions.
Pilot
1. Mount the pilot with the bulb projecting entirely into
the liquid or air being controlled.
Note
If the body is not in a horizontal position
with air gauges on top, loosen the
set screw (key 5) on bottom of body
nearest the bulb and rotate the body to
horizontal position.
2. Retighten the set screw.
3. Connect a reliable source of clean compressed
air (not to exceed 32 psi / 2.21 bar) to the inlet of
the pilot.
4. Set the supply air at 2 psi / 0.14 bar above the
maximum desired air signal. If air is available at a
higher pressure, install a pressure reducing valve.
5. Connect pilot outlet to 1/4 in. / 6.35 mm tap on top
of pressure pilot.
Start-up and Setting
▲ WARNING
The controller may be handling
hazardous fluids. Only qualified
personnel, who are familiar with the
installation, should be permitted to
install, readjust, inspect or maintain
the controller.
△ CAUTION
Insulation, may be applied to the pilot
body only. Do not insulate the bonnet.
1. Shut off supply air.
2. Set temperature adjusting knob at the lowest
temperature setting.
3. Turn on supply air. The supply air should be set
at 2 psi / 0.14 bar above the maximum desired
air signal.
Note
If air is available at a higher pressure,
install a pressure reducing valve. No
more than 1 to 2 lbs / 0.45 to 0.91 kg
should show on the control air gauge
(supplied with the T61 Series controller).
4. Gradually turn up temperature adjusting knob
until rising loading air pressure causes regulator
to open. Continue raising temperature setting
in this fashion until desired control temperature
is reached.
5. The T61 Series controller is factory set so that 5
degrees variation above and below the controlled
temperature will cause the loading air pressure
to vary approximately 8 lbs / 3.63 kg. The factory
setting produces satisfactory control.
6. If closer control is desired, the sensitivity of the
T61 Series controller can be increased by turning
the sensitivity screw (key 7) clockwise. This
will cause the control temperatures to move to
a position below the set point. This effect must
then be corrected by readjusting the temperature
adjusting knob (key 4).
7. Adjust slowly, turning the sensitivity screw no
more than 1/8 turn and allow two to three minutes
after each adjustment for the system to settle out.
Practical range of adjustment of the sensitivity
screw is 1/2 turn from the factory setting.
8. After final setting is reached, release the set
screw in the temperature adjusting knob and
reposition it so that the indicator is aligned with the
temperature being controlled. Retighten set screw.
9. If the hunt develops (a steady swinging
temperature) when the sensitivity is increased,
the temperature pilot is being called on to function
at a setting finer than the installation will permit.
At this point, factors such as thermostat location,
reexamine trapping and valve size.
10. If the regulator swings immediately on startup
and does not settle out and decreasing the
sensitivity by turning the sensitivity screw (key 7)
counterclockwise cannot be tolerated, restudy the
installation as a whole.
4
T61 Series
CONTROL PIPE
PILOT TYPE A85
SERIAL NO. PLATE
RESTRICTION BEND 1/4" UNION
NO. 8B TEE
BLEEDPORT BEND
NO. 4A BLEEDPORT
SERIAL NO. PLATE
DO NOT INSULATE
BELOW THIS LINE
MAIN VALVE
TYPE E OR E2
NO. 5A
NO. 5B
RESTRICTION ELBOW–TYPE E
OPEN ELBOW–TYPE E2
Maintenance
▲ WARNING
To avoid personal injury, property
damage or equipment damage caused
by sudden release of pressure or
explosion of accumulated gas, do
not attempt any maintenance or
disassembly without first isolating the
controller from system pressure and
relieving all internal pressure from
the controller.
Controllers that have been disassembled
for repair must be tested for proper
operation before being returned to
service. Only parts manufactured by
Emerson should be used for repairing
this controller.
Due to normal wear or damage that
may occur from external sources, this
controller should be inspected and
maintained periodically. The frequency
of inspection and replacement of parts
depends upon the severity of service
conditions or the requirement of local,
state and federal rules and regulations.
△ CAUTION
Do not, under any circumstances,
loosen the bolts on the diaphragm
chamber of the T61 Series Temperature
Controller or attempt to dismantle the
thermostat element. The system is filled
with volatile fluid which, if lost, will
render the pilot inoperative.
Under normal conditions, complete dismantling
at regular intervals is not recommended. A valve
kept relatively free of dirt will function for years with
minimum attention.
• Inspect for dirt collected at bleedport 4A and
restriction elbow 5A.
• Inspect all joints for leakage. Keep bolts tight.
Never allow a leak to persist.
Troubleshooting
▲ WARNING
To avoid personal injury, property
damage or equipment damage caused
by sudden release of pressure or
explosion of accumulated gas, do
not attempt any troubleshooting or
disassembly without first isolating the
controller from system pressure and
relieving all internal pressure from
the controller.
Figure 3. T61 Series Tubing Bends Connection
5
T61 Series
Controllers that have been disassembled
for repair must be tested for proper
operation before being returned to
service. Only parts manufactured by
Emerson should be used for repairing
this controller.
Failure To Open
1. Check supply gauge to be sure it shows 2 psi /
0.14 bar higher than the required signal pressure.
2. Turn adjusting knob to top of temperature range.
Pressure should go to within 2 or 3 lbs / 0.91 or
1.36 kg of supply pressure. If not, check for dirt in
sensitivity screw and ball seating surface.
Failure to Close of Overriding
Delivery Pressure
1. Adjusting knob may have been tampered with.
2. If air pressure will not bleed down when adjusting
knob is turned to bottom of range, it is likely
that vent is plugged. Sensitivity screw (key 7)
improperly adjusted (open too wide).
Erratic Control
1. Fast over and under rides are the result of
fast load changes, usually accentuated by the
thermostat being located at a point where it cannot
immediately sense a change in conditions.
Installation Faults
1. Poor circulation through heater. Constant
circulation should be employed.
2. Traps on the return may be discharging erratically
or may be improperly installed.
3. Sticky check valve.
4. High lift to condensate hot well. Gravity drainage
from heater should be arranged or return
pumped installed.
Dismantling
1. Remove sensitivity screw (key 7) and clean.
2. Unlock knob set screw. Loosen and move
adjusting knob (key 4) out to clear stop on dial
plate and lock to shaft.
3. Unscrew spool (key 3) from body by rotating
adjusting knob counterclockwise.
4. Carefully examine O-rings (key 6) for nicks and
other defects.
5. Examine spool (key 3) and ball (key 2) for defects.
6. Clean spool and ball with air pressure.
7. Reassemble.
Testing and Calibrating
Reverse Acting
For reverse acting pilots, control pressure decreases
with increasing temperature.
1. Plug the pilot control air port and apply supply
pressure 2 psi / 0.14 bar above the control range
to the supply air port.
2. Open the sensitivity screw (key 7) one turn while
establishing a steady system temperature.
3. Turn the spool (key 3) clockwise to the point where
the invar rod, ball and seat are in contact. The
control gauge should show pressure near the top
of the control range.
4. Turn the spool counter-clockwise until the control
pressure is at the middle of the range.
5. Continue to turn the spool counter-clockwise until
the low end of the range is reached.
6. Adjust the sensitivity screw as required so this
occurs within a 5° change on the dial. The control
pressure should vary from the minimum to the
maximum (15 or 30 psi / 1.03 or 2.07 bar) with a
10° change of the dial setting. When used with an
A-pilot the minimum is 3 psi / 0.21 bar, when used
with a control valve the minimum is the lower end
of the bench range.
Parts Ordering
When ordering parts, it is essential that the pilot type,
service and serial number be stated.
Select part by item number, but order by part number.
Specify complete part number when ordering.
6
T61 Series
Viton®is a mark owned by E.I. du Pont de Nemours and Co.
Parts List
Key Description Part Number
Repair Parts Kit
Type T61, Reverse Acting WAL08-11507-00
1 Bulb Assembly
Bronze WAL07-40190-03
Stainless steel WAL07-40191-03
2* Ball, Stainless steel WAL05-07709-00
3* Spool Reverse Acting Types T61, Brass WAL04-07741-00
4 Adjusting Knob, Plastic WAL05-07927-00
5 Body Set Screw, Steel WAL05-11134-00
6* Spool Sealing Rings, Viton®WAL05-04004-00
7* Sensitivity Screw, Steel WAL05-07930-00
8* Valve Spring, Stainless steel WAL05-05175-00
9 Pressure Gauge WAL05-17460-00
10 1/8 Nipple, Brass WAL05-17459-00
11 1/8 Tee, Brass WAL05-17458-00
*These parts furnished in Repair Kit
Figure 4. T61 Series Assembly
TYPE T61
SERIAL
NUMBER
PLATE AND
FLOW ARROW
SUPPLY
AIR
1/8" NPT 1/8" NPT TYPE T61 PILOT
REVERSE ACTING
VENT (DO NOT PLUG)
PILOT
BODY
CONTROL AIR
TO PILOT
Key Description Part Number
7
T61 Series
SD4522D
Emerson Automation Solutions
SpenceValve.com
VCIMD-14960 © 2021 Emerson Electric Co. All rights reserved. 11/21
Spence is a mark owned by one of the companies in the Emerson Automation
Solutions business unit of Emerson Electric Co. The Emerson logo is a
trademark and service mark of Emerson Electric Co. All other marks are
property of their prospective owners.
The contents of this publication are presented for informational purposes only,
and while every eort has been made to ensure their accuracy, they are not to
be construed as warranties or guarantees, express or implied, regarding the
products or services described herein or their use or applicability. All sales are
governed by our terms and conditions, which are available upon request. We
reserve the right to modify or improve the designs or specications of such
products at any time without notice.
Emerson Electric Co. does not assume responsibility for the selection, use
or maintenance of any product. Responsibility for proper selection, use
and maintenance of any Emerson Electric Co. product remains solely with
the purchaser.
T61 Series
Americas
McKinney, Texas 75070 USA
T +1 800 558 5853
+1 972 548 3574
Europe
Bologna 40013, Italy
T +39 051 419 0611
Asia Pacic
Singapore 128461, Singapore
T +65 6777 8211
Middle East and Africa
Dubai, United Arab Emirates
T +971 4 811 8100
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