Cashco 135 User Manual

INSTALLATION, OPERATION, & MAINTENANCE

MANUAL IOM

IOM-135

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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 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,.

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

SECTION V

V. CALIBRATION

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

for instructions to remove and replace the Model 135 thermal probe. Write the main valve serial number on an
adhesive label and apply to the probe. Return all used thermal probes to the factory for examination and calibration.

SEC TION VI

VI. TROUBLE SHOOTING GUIDE

1. No/Low Flow or Pressure at Normal Operating Temperatures

Possible Causes Remedies

A. No supply pressure to PTCM. A Check gauges.

B. Lockout valves closed. B. Open valves.

C. Unloading valve incorrectly set. C. Reset.

D. Model 135 thermal probe vent leaking. D. Under normal operating conditions, there should be no fl ow

coming from the outlet vent. If there is fl ow and the temperature of
the gas is not suspect then replace the Model 135 thermal probe.

E. Upstream fi lter/orifi ce blocked. E. Inspect and replace if necessary.

F. Unloading valve malfunction. F. Inspect and replace if necessary.

G. Leaking or broken fi tting. G. Inspect and replace if necessary.

H. Main regulator stuck closed. H. Verify dome pressure.

I. Strainer blocked. I. Inspect and replace if necessary.

2. Poor Pressure Control

Possible Causes Remedies

A. Back Pressure valve failed A Inspect and replace if necessary.

B. Upstream fi lter/orifi ce blocked. B. Inspect and replace if necessary.

C. Leaking or broken fi tting. C. Inspect and replace if necessary.

D. Diaphragm in main regulator failed. D. Inspect and replace if necessary.

3. Delivery Pressure Rise at No/Low Flow

Possible Causes Remedies

A. Main regulator seat leakage. A Inspect and replace if necessary.

B. By-pass valve leaking. B. Inspect and replace if necessary.

The contents of this publication are presented for informational purposes only, and while every effort 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. We reserve the right to modify
or improve the designs or specifi cations of such product at any time without notice.
Cashco, Inc. does not assume responsibility for the selection, use or maintenance of any product. Responsibility for proper selection, use and maintenance of any
Cashco, Inc. product remains solely with the purchaser.

IOM-135

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Cashco, Inc.
P.O. Box 6
Ellsworth, KS 67439-0006
PH [phone]
Fax. # [phone]
www.cashco.com
email: [e-mail]

Printed in U.S.A. 135-IOM

Cashco GmbH
Handwerkerstrasse 15
15366 Hoppegarten, Germany
PH [phone]
Fax. No. [phone]
www.cashco.com
Email: [e-mail]

Cashco do Brasil, Ltda.
Al.Venus, 340
Indaiatuba - Sao Paulo, Brazil
PH [phone]
Fax. No.
www.cashco.com
Email: [e-mail]