Cashco 135 User Manual

INSTALLATION, OPERATION, & MAINTENANCE
MANUAL IOM
IOM-135
12/13
MODEL 135
PNEUMATIC CONTROLLER
LOW TEMPERATURE SHUTOFF
SECTION I
I. DESCRIPTION AND SCOPE
The Model 135 thermal probe is a low temperature shutoff device with an integral, rigid insertion bulb used to protect downstream piping systems and equipment from experiencing temperature excursions below desired minimum operating temperature due to equipment malfunction or customer overdraw of system capacity. This is NOT a
SAFETY DEVICE.
The Model 135 is not a stand-alone device. Primarily installed with a pressure loaded reducing regulator with fail-close action upon the loss of loading pressure. It is used with any compatible fl uid that can be vented to atmo- sphere in an environmentally acceptable method. This combination of equipment is known as a PRESSURE/LOW TEMPERATURE CONTROL MODULE (PTCM). It typically consists of a Model 135 thermal probe, an unloading backpressure valve, fl ow restricting orifi ces and a main regulator.
II. PRINCIPLES OF OPERATION
As the Model 135 thermal probe external sheath is exposed to lower temperatures, it contracts in length. The internal Invar rod remains unchanged in length, pushing a ball/plug away from its seat, allowing the inlet gas pressure to be "vented".
The PTCM low temperature protection is provided through the Model 135 thermal probe. When the fl uid
III. INSTALLATION
1. Inspect the SST tag on the Model 135 and note the Calibration and Re-Calibration dates. If the Re-Calibration date has expired, return the Model 135 to Cashco. Inc, for recalibration. If the tag is missing do not install the unit, return it to Cashco. Inc,. Each probe is factory cali brated per customer's order and set point speci cations.
2. Prior to installation, check that the Model 135 operates within the desired window for the set point. If it does not operate correctly, return it to Cashco. Inc,.
SECTION II
is approximately 8°F (4.5°C) above the setpoint, the Model 135 thermal probe will begin to open, lowering the loading pressure and thereby the delivery pres­sures. The delivery flow rate is reduced by this action. When the fluid is at the setpoint, the Model135 thermal probe will reduce the loading pressure to 5 psig (.34 Barg),essentially closing the main regulator. When the fluid is slightly below setpoint the main regulator will close tight.
SECTION III
CAUTION
Setpoint for the probe can shift if it is mis-handled prior to installation.
3. Apply a compatible sealant to the 1/2" (DN15) NPT threads and insert the Model 135 probe into the upstream pipe line requiring control. With a wrench, secure the fl at surfaces on the body and rotate the probe clockwise (CW) until probe is tight. See Figure 1.
SECTION IV
IV. MAINTENANCE
1. The Model 135 is shipped from the factory preset per the customer's order specifi cations. All main- tenance should be preformed at the factory.
WARNING
SYSTEM UNDER PRESSURE. Relieve all pressure prior to removing the Model 135 from the piping system or performing any maintenance on the PTCM. Failure to do so could result in personal injury.
Figure 1
2
IOM- 135
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