Cashco 135 Low Temp Thermal Probe User Manual download pdf

INSTALLATION, OPERATION, & MAINTENANCE

MANUAL IOM

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.

IOM-135

12/13

SECTION II

II. PRINCIPLES OF OPERATION

III. INSTALLATION

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

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 speciﬁ

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,.

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.

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 pres-

sures. 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.

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Summary of Contents

Page 1 - MODEL 135

INSTALLATION, OPERATION, & MAINTENANCEMANUAL IOMMODEL 135PNEUMATIC CONTROLLERLOW TEMPERATURE SHUTOFFSECTION II. DESCRIPTION AND SCOPEThe Model

Page 2 - SECTION IV

IOM- 13521. The Model 135 is shipped from the factory preset per the customer's order speciﬁ cations. All main-tenance should be preformed at th

Page 3 - SEC TION VI

IOM-1353 All Model 135 thermal probes should be re-calibrated annually if the unit has been in service. Refer to Section IV for instructions to remo

Page 4

Cashco, Inc.P.O. Box 6 Ellsworth, KS 67439-0006PH (785) 472-4461Fax. # (785) 472-3539www.cashco.comemail: [email protected] in U.S.A. 135-IOMC

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Cashco 135 Low Temp Thermal Probe User Manual

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