Powers 744 Series Accritem Rigid and Remote Bulb Blind Controllers - Remote Bulb - Manual

Operation . . . . . . . . . . . . . . . . . . . . . . . . Direct and Reverse Acting
Adjustment Dial Range — Standard 0 to 300°F (-20 to 100°C)
Maximum Supply Pressure
at Room Temperature . . . . . . . . . 20-30psi (138-207 kPa)
Air Consumption (max.) . . . . . . . . . . . . 54.6 cm 3/s (200 SCIM)
Maximum Operating Pressure
. . . . . . . . . .
1,724 kPa (250psi)
Maximum Operating Temperature
. . . . . . . . . . . .
350°F(177°C)
Air Connective . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1/8″ NPT
Shipping Weight . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 lbs. (0.9 kg)
Sensitivity (adjustable) . . . . . . . . . . . . . . . . . . . 4.3 to 24.8 kPa/°C
(0.35 to 2psi/°F)
Maximum Pressure on Wells
Stainless Steel no. 744-082 1000psi (6,890 kPa)
Copper no. 744-111 400psi (2,756 kPa)
TECHNICAL INSTRUCTIONS
Accritem II Controller
Remote Bulb
TI TC744-2
The Accritem II non-indicating temperature controller is a
pneumatically operated instrument recommended for exact
control of temperature in industrial, heating and air condi-
tioning processes. The controller features a liquid filled
thermal system with a remote bulb to sense temperature.
The calibrated dial of the Accritem II has a Fahrenheit range
on one side and a Celsius range on the other. The dial plate
need only be unscrewed and flipped over.
The action of the Accritem II and control valve must be
coordinated for the system to work. See Figure 1.
The Accritem II is an extremely versatile instrument recom-
mended for simple, economical temperature control and
dependable, maintenance-free operation. The compact size
and remote bulb makes it ideally suited for process vats
and ovens, engine cooling systems, instantaneous and
large volume water tanks, chemical process equipment,
etc. The Accritem II can also be used in air handling sys-
tems, humidifier, and in many other applications.
Case: Mount the Accritem II body in any position as close
as possible to the valve being controlled. Use the mount-
ing bracket attached to the back of the Accritem II. Fasten
bracket to any flat surface using any suitable screws in the
2 slotted holes about 3″ (76 mm) apart.
Thermal: Thermal bulb must be located within 48″ (122
cm) of the Accritem II. Thread the well or tank bushing
into the pipeline or tank. Choose a location which is rep-
resentative of the average process temperature. If air
temperature is being controlled, use a duct mounting
flange and support the bulb inside the duct. Carefully
uncoil capillary and insert the bulb into the well, bushing,
or flange. Do not cut or crimp the capillary - protect it
from mechanical damage.
Air Connection: Use 1/4″ (6.4 mm) O.D. copper or plastic
tubing with suitable fittings for the 1/8″ NPT threaded “S”
and “R” connections in the Accritem II body.
Set pressure Reducing Valve to supply 20 to 30psi
(138 to 207 kPa) air to Accritem II.
SPECIFICATIONS
DESCRIPTION
APPLICATION
INSTALLATION
APPLICATION
HEATING COOLING MIXING
Hot Piped to
Normally Open Normally Closed
Normally Open
Valve Valve
Port of Valve
Valve Opens to
Valve Opens Valve Closes
Hot Flow on
on Air Failure on Air Failure
Air Failure
Hot Piped to
Normally Closed Normally Open
Normally Closed
Valve Valve
Port of Valve
Valve Opens to
Valve Closes Valve Opens
Cold Flow on
on Air Failure on Air Failure
Air Failure
ACCRITEM
Type
Direct
Acting
Reverse
Acting
Figure 1