Mark 25 Series Tempilot™ Temperature Controller Options & A

Mark 25 Series Tempilot™ Temperature Controller Options & A
Options & Accessories
Mark 25 Series
Tempilot™ Temperature Controller
The Jordan Mark 25 is a temperature controller that
uses instrument air to position a control valve or airoperated regulator (such as the Jordan Mark 66) in a
process line.
Sensitive to changes in the process — responds to
temperature changes as low as 0.5°F (-17,5°C)
Standard gauges — supply and control pressure
gauges are standard on all units
Adjustable proportional band — adjustable from
2-1/2% to 24%
Choice of action — available for direct or reverse
action requirements
Fast delivery — 36 hour shipment usually available
Action: direct or reverse
Adjustment dial range (standard): 50° to 350°F
(10° to 177°C)
Max. supply pressure at room temperature: 25
psi (1,5 bar)
Max. operating pressure: 250 psi (17 bar)
Temperature response: 0.5°F (-17,5°C)
Mounting: 1/2” NPT
Air or water connection: 1/8” NPT
Drain connection (water only): 1/4” NPT
Proportional Band: 2-1/2% to 24%
Regulator: standard on all units
Gauges: supply and control pressure standard
Accessories: thermowells, flanges and unions
Shipping weight: 4 pounds (1,8 kg)
Jordan Valve, a division of Richards Industries
3170 Wasson Road • Cincinnati, OH 45209
513.533.5600 • 800.543.7311 • 513.871.0105 (f)
[email protected] •
Mark 25 Temperature Controller
High rangeability — when combined with Jordan
control valves, the rangeability is 50:1 or better
Mark 25 Tempilot™ Temperature Controller
Positions "B" and "D" (dotted
show pivot point (B) and spring
location (D) for reverse acting
The sensitivity of the Tempilot™ controller is adjusted by
turning the restriction screw. The restriction screw is factory-set for air operation. For water operation, the restriction screw should be opened a minimum of 1/12 turn and
the controller re-calibrated. The restriction screw must
never be fully closed. Make adjustments slowly, allowing
about two minutes after each adjustment for the controller
to balance. (Note: if sensitivity is changed, the controller
must be re-calibrated).
1/2" Dia.
1/2" NPT
1/8" NPT
Figure 1
A temperature change in the medium being controlled
creates a change in length of the sensitive tube (1). An
increase in temperature lengthens the sensitive tube (1)
and moves the Invar rod (2) away from the lever (3). The
lever (3), which pivots at Point A, moves to close the exhaust valve (4) by the spring (5). This permits the supply
(air or water) (S) to increase the pressure in the control
line (R) and close the normally-open valve.
A decrease in temperature shortens the sensitive tube (1)
and moves the Invar rod (2) against the lever (3). The
lever (3) moves against the pressure spring (5) to open
the exhaust valve (4). This exhausts the pressure in the
control line and opens the valve.
The sensitivity adjustment screw (6) regulates the rate
of flow of the supply air (or water) to the controller to a
change in temperature. Turning the screw clockwise increases the sensitivity by reducing the flow and increasing the response time. Turning the screw counterclockwise decreases the sensitivity by increasing the flow and
reducing the response time.
A clean, reliable supply of compressed air at 15 - 25 psi
(1,03 - 1,72 bar) is required. For air operation, the Tempilot™ should normally be installed in the horizontal position; however, other positions may be used if the supply
and control connections are parallel with the ground and
calibration is checked after installation.
Using with the Mark 66 Air Loaded Regulator
Combining the Mark 25 Tempilot™ with Jordan Valve’s
Mark 66 provides an ideal package for controlling the
temperature of heaters. Instrument air of 20 psig (1,38
bar) must be available to the Tempilot™. Outlet steam
pressure from the Mark 66 will not exceed 20 psig (1,38
The Mark 66 valve seats are normally closed. The reverse
acting Tempilot™ sends a 20 psi (1,38 bar) air signal to
the top of the valve diaphragm, opening the valve seats.
The downstream pressure will balance under the diaphragm and will remain nearly the same as the loading
pressure from the Tempilot™ (max. 20 psig/1,38 bar). As
the process approaches set temperature, the output signal from the Tempilot™ decreases, and consequently, the
pressure downstream of the valve decreases. When the
set temperature is reached, the Tempilot™ output signal is
0 psi and the valve seats are closed. The Mark 66 regulator performs its normal function as a pressure reducing
valve by reducing the inlet pressure to 0 - 20 psig (0 - 1,38
bar) (the Tempilot™ output).
Jordan Valve, a division of Richards Industries
3170 Wasson Road • Cincinnati, OH 45209
513.533.5600 • 800.543.7311 • 513.871.0105 (f)
[email protected] •
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