GPL 750 Manual

Installation and
Maintenance Manual
GPL 750
Natural Gas Odorization
System
Patented
GPL Odorizers
12450 W. Cedar Drive
Lakewood, CO 80228
303 927-7683
[e-mail]
www.GPLodorizers.com
www.LincEnergySystems.com (master distributor)

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303-927-7683
GPL Odorizers LLC
12450 West Cedar Drive
Lakewood, CO 80228
[e-mail]
Thank you for your purchase of the GPL 750 Natural Gas Odorization System. You will find the GPL 750
Installation and Maintenance manual in the pages that follow.
Please understand that failure to adhere to these instructions may void warranty, destruction of
property, injury, or even death. Our service contracts are a convenient and cost-effective way to protect
your warranty coverage as well as your property. If you are interested in learning more about our GPL
Odorizers Maintenance Program to ensure that your unit remains functioning correctly, please call us
today at [phone].
Thank you for your trust in our products.
Garrett Cox
Director of Operations
GPL Odorizers LLC

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Do not install, maintain, or operate this equipment without reading, understanding, and following the GPL
Odorizers instructions. Otherwise, injury or damage or both may result.
Copyright
© 2017-2022 by GPL Odorizers LLC. All rights r es er v e d .
The information contained in this document is subject to change without notice. No part of this document may be reproduced or
transmitted in any form or by any means, electronic or mechanical, including photocopying and recording for any purpose without
the express written permission of the manufacturer. The GPL 750 is protected by US patent # 7,056,360 and other pending patents.
Limit of Liability
GPL Odorizers, its employees, agents, and the authors and co n tr i b u t o r s to t hi s document specifically di s c l a im all liabilities
and warranties, express
or implied (in c l udin g warranties of merchantability and fitness for a particular purpose), for the
acc
urac y, currency, completeness, and/or reliability of the information contained herein a n d/o r
for the fitness for any
particular use and/or for the performance of any material
a n d/
or equipment selected in whole or part with the user
of/or in reliance
on information contained herein. T he selection of materials and equipment is at the sole risk of the
user
o f this p u b lic a t ion.
Note
The information contained in this document is subject to change without n o t ice.

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Contents
Safety Information......................................................................................................................................... 6
General Safety Precautions ........................................................................................................................... 6
Warning Labels.............................................................................................................................................. 7
1.1 GPL 750 System Components.............................................................................................................. 8
1.2 Odorant Filter ...................................................................................................................................... 9
1.3 Pressure Regulator .............................................................................................................................. 9
1.4 Solenoid Valve ..................................................................................................................................... 9
1.5 Metering Valve .................................................................................................................................... 9
1.6 Optical Comparator........................................................................................................................... 10
1.7 HMI/PLC ............................................................................................................................................10
1.8 Drip Chamber and Optical Array........................................................................................................ 11
2.0 Principles of Operation..........................................................................................................................12
3.0 Installation ............................................................................................................................................ 13
3.1 Site Requirements ............................................................................................................................. 13
3.1.1 Unit Location ..............................................................................................................................13
3.1.2 Blanket Gas................................................................................................................................. 14
3.1.3 Electrical Power ......................................................................................................................... 14
3.2 Equipment and Tools.........................................................................................................................14
3.3 Tubing................................................................................................................................................14
3.4 Wiring................................................................................................................................................15
3.4.1 Electrical Connections ................................................................................................................16
3.4.2 Terminal Block 2 ......................................................................................................................... 22
3.5 Leak Testing....................................................................................................................................... 24
3.6 Purging the Odorant Line ..................................................................................................................25
3.7 Unit Configuration............................................................................................................................. 25
3.7.1 Setting up the Modem ............................................................................................................... 25
3.7.2 Configure Using Webpages........................................................................................................27
3.7.3 Configure Using the HMI ...........................................................................................................27
3.8 Optical Comparator ...........................................................................................................................28

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3.8.1 Calibrate Optical Comparator....................................................................................................28
4.0 Accessories............................................................................................................................................30
4.1 Included.............................................................................................................................................30
4.1.1 Sonic Muffler..............................................................................................................................30
4.2 Optional ............................................................................................................................................ 30
4.2.1 120VAC Hazardous Location Heater..........................................................................................30
4.2.2 120VAC to 24VDC Converter Power Package ............................................................................30
4.2.3 GPL 100 Thermal Mass Flow Meter ...........................................................................................30
5.0 Tanks .....................................................................................................................................................31
6.0 Standard Warranty ................................................................................................................................31
7.0 Factory Assistance................................................................................................................................. 34
8.0 GPL 750 Maintenance Operations ........................................................................................................35
8.1 Weekly ..............................................................................................................................................35
8.2 Monthly.............................................................................................................................................35
8.3 Yearly................................................................................................................................................. 35

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Safety Information
Please read the entire manual before attempting to unpack, set up, or operate this product. Failure to
do so could result in serious personal injury and equipment damage. Pay careful attention to all
Warnings, Cautions, and Notes.
Use of Hazard Information
If multiple hazards exist, the signal word corresponding to the greatest hazard shall be used.
Definitions
DANGER indicates a hazardous situation exists that may result in death or serious
injury if not avoided.
WARNING indicates a hazardous situation exists that could result in death or
serious injury if not avoided.
CAUTION, used with the safety alert symbol, indicates a hazardous situation exists
that could result in minor or moderate injury if not avoided.
NOTICE is used to address practices unrelated to personal injury, which could lead
to property damage.
NOTE: Information that requires special emphasis.
SHALL: This word is understood to be mandatory.
SHOULD: This word is understood to be advisory.
General Safety Precautions
Selection, Installation, and Use
Improper selection, installation, or use can cause personal injury or property
damage. It is solely the responsibility of the user, through its own analysis and
testing, to select products suitable for their specific application requirements,
ensure they are properly maintained, and limit their use to their intended
purpose.

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Follow proper local, state, and federal regulations for proper installation and
operational requirements.
Always use caution and common sense when working with any chemical. Read
the product label and MSDS carefully and follow the instructions exactly.
Potential Equipment Hazards
Hot surfaces! This equipment may have very hot surfaces. If an operator
contacts a hot surface, an injury may occur. Use protective clothing to prevent
injury. If other equipment comes in contact with a hot surface, damage to the
equipment may occur. Ensure the area around this equipment is kept clear to
prevent damage from occurring.
High pressures! This equipment may contain fluids at very high pressures.
Before installing, removing, or maintaining this equipment, ensure that the
equipment is isolated from all connecting piping, the equipment is
depressurized, the contents have been drained, and the equipment is cool.
When changing any electrical or electronic parts, the power must be turned off,
or the warranty is null and void.
Warning Labels
Location
Content
Power Strip
Before connecting power
1. Install an appropriately sized fuse per local electrical code.
2. Wire Sized for 24VDC@6A
3. Isolated from Pipeline
4. Proper power protection
5. Conduit per Hazardous Location Standards

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1.0 Overview
The GPL 750 natural gas odorizer accurately doses the gas with odorant in individual droplets of 0.01
cc. The optical sensor counts each droplet and feeds the information back to the controller. The
controller measures the flow and injects the next odorant dosage when sufficient gas has passed.
The actual dose is calculated and optimized based on flow rate requirements and the configured
injection rate. The measure can vary from one to multiple drops to provide optimal and consistent
odorization and maximize the component life. The target period between doses is three minutes.
The optimization algorithm creates some variation in the duration between doses to compensate for
the effects of flow rate fluctuations.
1.1 GPL 750 System Components
Class I Div. 2 Featured in Illustration

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1.2 Odorant Filter
The continuous mode provides a constant
odorant flow into the stream at appropriate
proportions. Use the continuous mode for gas
flow rates higher than 100 MSCFH.
1.3 Pressure Regulator
The pressure regulator allows the customer to
adjust odorant pressure. A sensing line is
connected to the gas pipeline so the regulator
can react to fluctuating pipeline pressures and
keep the differential constant (similar to a
dome-loaded regulator). The pressure gauge
reflects the odorant outlet pressure.
1.4 Solenoid Valve
The solenoid valve controls the flow
of odorant to the pipeline. When the
unit injects a batch of odorant into the
pipeline, the solenoid opens; the valve
closes when the desired amount of
odorant is injected. Normally, the
valve is closed for safety. In the event
of power loss or solenoid failure, the
valve can be opened manually. Per
GPL Warranty, this valve must be
replaced after 1,000,000 cycles. The
PLC triggers an alarm when the cycle
limit is reached.
1.5 Metering Valve
The metering valve regulates the drip
rate of the odorant into the pipeline.
To decrease the drip rate, turn the
valve clockwise. To increase the drip
rate, turn the valve counterclockwise.
This valve has a hex key that allows
the technician to lock the valve into
place
Odorant Filter

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1.6 Optical Comparator
The optical comparator and arrays use fiber
optics to count drops as they fall through the
drip chamber and into the line. Even with tiny
doses, the reliable counting of drops drives the
injection system’s accuracy.
The optical array on one side of the drip
chamber transmits a beam that is picked up by
the array on the opposite side. When the beam
intensity suddenly changes, the comparator
registers a drop. When the comparator “sees” a
drop, it transmits a signal to the PLC.
•Green light - Comparator is powered
(always on)
•Red light - The arrays are locked onto each
other (always on)
•Yellow light - A drop has fallen. If there is
more or less than one flash per drop, the
comparator must be calibrated.
1.7 HMI/PLC
The HMI/PLC controls all operations
of the odorizer. All inputs/outputs are
connected to the PLC (Solenoid
actuation, flow signal, odorant drip
count, etc.). The bright LCD and
touchscreen allow the technician to
control and configure all settings of
the odorizer. This PLC is available with
a heated display for cold weather
applications.
Controller
Optical Comparator

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1.8 Drip Chamber and Optical Array
The drip chamber incorporates the use of (2)
optical arrays on either side of the chamber
to count the odorant drops. There is a total of
(3) sight glasses, (2) for the optical arrays, and
(1) for the technician to observe odorant
droplets.

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2.0 Principles of Operation
•The GPL 750 uses batch mode operation to odorize natural gas; the unit waits for a
predetermined amount of gas to flow through the pipeline meter before opening the solenoid
valve and injecting the odorant.
•When a batch is called for, the PLC actuates the solenoid opening up the pathway for odorant to
drip into the pipeline.
•The controller registers each drop that passes the optical sensor, and a flow rate is determined.
The optical sensor can accurately record drops as fast as 6/sec, which is well beyond the
maximum dosing rate range.
•If an additional drop falls after the valve is shut, the system recognizes the incident, and an
appropriate additional amount of gas is calculated and permitted to flow before the next dose.
•Spring- and dome-loaded regulators automatically control the pressure of the odorant to the
injector based on pipeline pressure to ensure consistent dosing.
•The controller calculates the odorant injection rate and determines the total odorant usage. A
pulse is generated when a configurable mass of odorant has flowed.
•Additionally, measured gas flow rate and mass of odorant injected are stored hourly in non-
volatile memory for regulatory documentation.
•The system monitors itself and generates an external alarm signal if it cannot odorize within the
configured alarm range. Alarm conditions are stored and time-stamped in non-volatile memory.
•In a power failure, the solenoid may be manually opened and the pressure regulator adjusted to
provide an acceptable injection rate in a mechanical mode. In this case, if the flow computer is
down because there is no power on site, gas can still be safely odorized and delivered.
•With only one moving part contacting the odorant, this is a highly reliable and easily maintained
system.
•The controller combines the speed and programming power of a PLC with a low current draw
and flexible communications of an RTU and the modern features of an internet server.

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3.0 Installation
Qualified personnel should perform the installation by applicable state/
provincial and local codes and procedures.
3.1 Site Requirements
3.1.1 Unit Location
The GPL 750 must be mounted high enough to run 1/2" stainless steel tubing from the
outlet on the bottom of the unit to the injection point on the pipeline. Allow room for the
sonic muffler (P/N 6-05081A, shipped loose), dielectric union, a ball valve to isolate the
odorizer from the pipeline, and a "blow-back" tee and ball valve. The tubing exiting the
bottom of the GPL 750 shall be no less than 45 degrees from the horizontal, and there
should be no horizontal portions of tubing between the unit and the injection point. This
positioning allows the drops to fall by gravity into the pipeline. Because the electrical and
mechanical components are in separate enclosures, the electrical enclosure does not need
to be mounted above the pipeline. GPL Odorizers recommends that the electrical
enclosure be installed so that the odorizer technician can easily access it.
Mounting methods include wall, pole, stand, skid, or custom package.
Class I Div. 2 Featured in Illustration

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3.1.2 Blanket Gas
Blanket pressure on the odorant tank provides the differential pressure necessary to
drive the odorant into the line.
• Blanket gas pressure must be 15 PSI over the pipeline gas
• Nitrogen or pipeline gas
3.1.3 Electrical Power
• 24 VDC
• 6 Amp
3.2 Equipment and Tools
Tools needed for installation of the GPL 750 include:
• Allen wrenches
• Open-end wrenches
• Precision flathead (jeweler’s) screwdriver
3.3 Tubing
Once an appropriate location has been determined for the GPL 750 and the unit has
been properly mounted, use Tubing Illustration on the following page to install the
tubing per your company’s procedures and applicable code.
Use stainless steel tubing for proper strength, support, and leak
prevention.

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Tubing Illustration

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3.4 Wiring
Always disconnect power before servicing connections.
Use the guidelines below to wire any necessary connections. Please note that not every
connection described in this section is used for every site. If you have any questions, please
contact GPL Odorizers.
3.4.1 Electrical Connections
Refer to electrical diagrams on the following pages.
1. Ensure that power is disconnected
2. Connect 24VDC (+) to the top side of
the black fuse next to TB1, the wire
on the other side of the fuse should
be connected to TB1 1(factory
wired).
3. Connect 24VDC (-) to TB1 6. Connect
24VDC (-) to TB1 5 for Class 1
Division 1 electronics.
4. Connect conduit per applicable
code.
5. Always refer to current wiring diagrams shipped with your odorizer. The wiring
instructions in this manual are for reference purposes only, and wiring is subject
to change without notice.
Note:
If 24 VDC is not available, use a
120 VAC to 24 VDC Converter
(available from factory).
Electrical Connection
Illustration on next page.

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Class I Div. 1 Page 1

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Class I Div. 1 Page 2

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Class I Div. 2 Page 1

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Class I Div. 2 Page 2