Envent TFS1 User manual

TFS Analyzer
Operator’s Manual
Last Updated: 26 Nov 2021
Revision: 3.1
TFS1 TFS2
2721 Hopewell Place NE
Calgary, Alberta, Canada
T1Y 7J7
Tel: [phone] Fax: [phone] Email: [e-mail]
For further information, or a copy of our most recent operating manual, please visit us at
www.enventengineering.com. Envent Engineering Ltd. reserves the right to change product design
and specifications at any time without prior notice.

Envent Engineering Ltd. TSF Installation and Operator’s Manual Last Updated: 26-Nov-21
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TABLE OF CONTENTS:
Introduction:.................................................................................................................. 4
About this Manual: .................................................................................................................................. 4
Principle of Operation: .............................................................................................................................. 5
Measurement Principle: .......................................................................................................................... 6
Technical Specifications: ........................................................................................... 6
Sample Point Selection:............................................................................................................................. 8
First Stage Pressure Reduction and JT Cooling Effect:............................................................................. 8
Sample Volume and Flow Rate: ............................................................................................................ 9
Sample Conditioning System (SCS):........................................................................................................10
Installation: ...............................................................................................................................................11
Customer Connections: ............................................................................................ 12
Serial Communication:...........................................................................................................................13
Relay Outputs and Solenoid Driver:.........................................................................................................14
TFS Analyzer Start-up and Operation: ............................................................... 14
LCD Keypad Display:..............................................................................................................................17
Recommended Maintenance Schedule:............................................................. 19
Filter Replacement Procedure...............................................................................................................19
Fuse Replacement ..................................................................................................................................19
Sample Conditioning System Cleaning Procedure:............................................................................20
Material List: Cleaning kit part number: 330900 ...............................................................................20
Gas Cell Dis-assembly Exploded View................................................................ 21
Risk Assessment – Safety Information.......................................................................... 21
APPENDIX A: Recommended Spare Parts List.......................................................... 26
APPENDIX B: Chico A Sealing Compound For Sealing Fittings in Hazardous
Locations.......................................................................................................................... 27

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Figures and Tables:
Figures:
Figure 1: Typical TFS SCS ...........................................................................................................................10
Figure 2: Controller Board Layout & Power Input........................................................................................12
Figure 3: TFS-2/TFS-YP USB Communication Connection ........................................................................13
Figure 4: TFS-1 USB Communication Connection.......................................................................................13
Figure 5: Relay Outputs & Solenoid Drivers ................................................................................................14
Figure 6: TFS Standard Operator Interface ...................................................................................................17
Figure 7: Fuse Installation .............................................................................................................................19
Tables:
Table 1: Specifications Table ......................................................................................................................... 7
Table 2: Sample Lag Time vs. Tubing Size ................................................................................................... 9
Table 3: Customer Connection Summary (See Figure Above) .....................................................................12
Table 4: Analyzer Display-button functions..................................................................................................18

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Introduction:
About this Manual:
The TFS Gas Analyzers are spectroscopic gas analyzers for use in remote locations, running
unattended for extended periods of time. This User and Installation Manual provides information
about the following Envent TFS Gas Analyzers:
•TFS1: Class I, Division 1 in an XP enclosure
•TFS2: Class I, Division 2 in a Nema 4X enclosure
This manual contains a comprehensive overview of Envent Engineering’s TSF Analyzers and step-
by-step instructions on:
•Installation and Start-up
•Operation
•Maintenance
•Troubleshooting
This manual should be read and referenced by the person who will install, operate, or have
contact with the TFS Gas Analyzer. Take time to familiarize yourself with the content of this
Operator’s Manual, reading each section carefully so you can quickly and easily install and
operate the analyzer.
The manual includes images, tables, and charts that provide a visual understanding of the
analyzer and its functions. Take note of all the caution symbols and notes, as they will alert you
of potential hazards and important information.
CAUTION: Before applying line pressure be sure that all pressure connections are secure and leak
tight.
CAUTION: Do not apply more than 25 psig to analyzer. Damage to the analyzer may result.
WARNING: The analyzer enclosure must be affixed to a structure using the supplied
brackets and 3/8" bolts and capable of supporting a minimum of 4 times the weight of the
analyzer. 1-5/8" Unistrut or equivalent, bolted or welded to the building structure is
recommended.
WARNING: Conduit must be properly DE-burred and anti-shorting bushings must be
installed to protect wiring from damage. A minimum of 5 threads of engagement is required
for rigid conduit in hazardous locations.
CAUTION: The user, through his own analysis and testing, is solely responsible for the product
selection and ensuring all responsibility, safety and warning requirements of the application are met.

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If the equipment is used in a manner not specified by Envent Engineering Ltd., the protection
provided by the equipment may be impaired.
CAUTION: Do not use solvents, brake cleaner, soaps or detergents to clean the analyzer and
sample conditioning system. CONTACT ENVENT ENGINEERING FOR CLEANING
REQUIREMENTS
CAUTION: Dis-assembly of the pressure regulator and solenoids in the field is not advised.
Consult the factory if the regulator or solenoid appears contaminated.
CAUTION: The analyzer should be mounted in an enclosed area in which it is not exposed to
vibration and excessive pressure, temperature and environmental variations. The TFS1 is
certified for Class I Div 1 hazardous locations. The TFS2 is certified for Class I Div 2
hazardous locations. Ensure that the analyzer received is suitable for the area classification
of the installation.
CAUTION: Turn off power before servicing. Ensure supply is off before connecting or
disconnecting supply power.
WARNING: (DC Power) This unit requires a disconnect device rated 24 VDC and 5 A
maximum, certified for the hazardous area of the installation and must be protected by a
circuit breaker rated 24 VDC and 5 A maximum.
WARNING: (AC Power) This unit requires a disconnect device rated 240 VAC and 5 A
maximum, certified for the hazardous area of installation and must be protected by a circuit
breaker rated 240 VAC and 5 A maximum.
WARNING: (TFSYP) The user must provide a continuous supply of clean instrument air to
the protected enclosure. The instrument air source must be located in a non-hazardous
location.
WARNING: (TFS1 and TFSYP) Electrical connections to the analyzer must use an explosion
proof connector or seal.
WARNING: (TFS-YP) A check valve must be installed in the sample inlet and sample outlet
of the analyzer. Swagelok part number SS-2C-1/3 is recommended.
CAUTION: The analyzer power fuse holder covers must be secured by a wire tie to prevent
unintended removal.
WARNING: The name plate affixed to the analyzer details warnings and cautions specific to
the model supplied. Read and understand the nameplate warnings and cautions before
installing the analyzer.
Principle of Operation:
The TFS Analyzer is a non-contact, light absorption based gas analyzer capable of percent level
concentration monitoring of multiple gas compounds. The analyzer consists of a light
spectrometer, a flow-through sample cell, a single-element photo-detector, and the supporting

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electronics. The spectrometer uses a unique Tunable Fabry-Perot assembly that provides
wavelength scanning with high optical throughput. An advanced spectral processing algorithm
computed in the embedded electronics provides highly accurate and robust quantitative
measurements.
The TFS Gas Analyzer is configured and calibrated for a specific wavelength analysis region(s)
depending on the application for which it is intended. It is designed to be a dedicated on-line
monitoring system that only requires periodic on-site span verification and zeroing every three
months. The specific system configuration and calibration is denoted by a Factory Serial Number
that can be found in the Final Span Calibration Verification Sheet delivered with the analyzer.
Example applications of the TFS Analyzer include:
•Hydrocarbon gas composition monitoring
•Petrochemical process monitoring
•Specialty and chemical gas process and blending monitoring
•Catalysis and combustion process monitoring
Measurement Principle:
When a gas sample is introduced into the gas cell, the light radiation provided by a broadband
light source is partially absorbed by the gas species present. The light absorption occurs at
specific frequencies and magnitudes depending on the gas compound and the concentration of
that compound. The TFS Gas Analyzer spectrometer module scans the wavelength and measures
the true absorption spectra and compares them with the pre-loaded calibration spectra. The on-
board analysis algorithm computes the predicted gas concentrations in real-time.
In principal, the absorption spectrum of each compound is unique which acts as a “fingerprint”
for identification or speciation analysis. In addition, the magnitude of the absorption is a function
of the number of molecules of the gas. With a known path length, pressure, and temperature,
the magnitudes of the absorption spectra are then used to compute volumetric concentrations.
This
first principle based technique provides accurate and robust measurements with minimal
span and baseline drifts.
The TFS Gas Analyzer employs an internal pressure transducer to measure the sample pressure
in real-time enabling pressure variation corrections. The flow cell is heated to a constant
temperature (default value is 60oC) with a sample preheat module to maintain both sample and
optical sensor temperature at a constant calibrated temperature, thereby ensuring measurement
accuracy and stability despite sample and environmental variations.
Technical Specifications:
Performance
Accuracy
+/- 0.2% of full scale per reading
Repeatability
<0.1%
Zero Drift <0.2% of full scale per month
Application Data
Sample Temperature
0-50°C (a)
Sample Humidity
5 – 95% RH non-condensing
Sample Inlet Pressure
0 – 30 psig
(a)
Sample Flow Rate 100 – 1000 cc/min (a)

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Electrical & Communications
Input Voltages 24 VDC, 5.0 A max
120-240 VAC, 50/60 Hz, 5.0 A max
Outputs
4-20 mA Analog Outputs (2 standard, optional 8 additional)
Serial RS-232, 485 (Communications/Modbus standard)
120 VAC 5AMP Max Relays (4 standard)
TCP/IP Ethernet (optional)
Archives 32 MB
Graphics Display
1 to 4 line primary data
Scrolling alarm marquee
Constant view marquee
Scrolling menu system
Physical Specifications
Size 24” x 15” x 8” deep
Weight
<55 lbs (25 kg)
Area Classification
Certification
TFS1: Class I, Division 1 Groups B,C,D in an XP enclosure
TFSYP: Class I, Division 1 Groups B,C,D in a Y purged Nema 4X
enclosure
TFS2: Class I, Division 2 Groups B,C,D in a Nema 4X enclosure
TFSP: General Purpose
(a) Consult factory for alternative requirements
Table 1: Specifications Table
The TFS Analyzer was configured, functionally tested and calibrated at the factory. All test and
calibration data is documented in the Factory Calibration Report.
CAUTION: The analyzer should be mounted in an enclosed area in which it is not
exposed to vibration and excessive pressure, temperature and environmental
variations. Ensure that the housing received is suitable for area classification.
•The TFS-1, TFS-YP is certified for Class I Division 1 Groups B,C&D
•The TFS-2 is certified for Class I Division 2 Groups B,C&D
The analyzer will be shipped for wall mount or uni-strut floor mount (for additional options consult the
factory).
Note: 3/8”x 1” bolts are recommended for installation.
CAUTION: Excessive temperature and environmental variations may affect the
integrity of the calibration gas. Should heavier components condense into the liquid
phase, the composition of the bottles will change.

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Envent Engineering is available for installation and start-up, if required. See Envent’s pre-commissioning
guidelines on our website (http://www.envent-eng.com/documents.php).
Sample Point Selection:
The sample to the analyzer must be representative of the process stream and should be taken
from a point as close as possible to the analyzer to avoid lag times and sample degradation in the
tubing. Sample transport, including sample probe assembly, is generally the responsibility of the
end user.
A probe should be installed vertically on a horizontal section of pipe ensuring that the sample is
drawn from between the middle and the top third of the pipeline.
An optional Genie GPR probe regulator may be included. The function of this probe is to ensure a
clean dry sample to the analyzer and to reduce the pressure of the sample. The lower pressure
will improve the response time of the analyzer. For installation instructions, refer to associated
documents. Do not install the Genie probe regulator on a vertical pipe.
First Stage Pressure Reduction and JT Cooling Effect:
First stage pressure regulation is ideally done at the sample point with careful consideration given
to the Joule Thompson Cooling Effect (JT Effect). The JT effect is loosely defined as the cooling
effect on gases as a result of pressure reduction. A general rule of thumb to determine JT effect
estimates a 7 °F cooling effect for every 100 psig of pressure reduction.
JT = Pressure Reduction/100 x 7 °F
Example:
Joules Thompson Effect
•Line Conditions
oPressure = 510 psig
oGas Temp= 70°F
oAmbient Temp= 50°F
•Calculate Joules Thompson Cooling Effect:
If the first stage pressure reduction takes line pressure of 510 psig to 10 psig the cooling
effect from first stage pressure reduction is:
(510-10)/100 x 7 = 35°F
So the gas is cooled by 35 °F as a result of Joules Thompson Effect.
•Calculate the Gas Temp:
If the initial Gas Temp is 70°F and the Joules Thompson Cooling Effect is 35°F then:
70°F - 35°F = 35°F

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So the Gas Temp traveling in the sample transport line to the analyzer Sample
Conditioning System is 35°F after first stage pressure reduction.
There may be some recovery or further temperature reductions as a result of ambient
temperature effects on the sample transport tubing and internal gas temperature, but the
potential for 2 phases (C6+ condensation) is greatest at the coldest point.
It is critical to preserve the composition of the gas, so it is important to consider the detrimental
effects that the Joules-Thompson effect may have on the sample. The sample temperature must
be maintained above the hydrocarbon dew point to prevent high BTU components to drop out
(liquefy) prior to analysis causing large errors in measurement.
The hydrocarbon dew point is the temperature (at a given pressure) at which the hydrocarbon
components of any hydrocarbon-rich gas mixture, such as natural gas, will start to condense out
of the vapor phase.
Sample Volume and Flow Rate:
Sample should be supplied to the TFS analyzer sample conditioning system (SCS) at 50-250 psig
for each stream. For lean gas (BTU of 1050 or less and relative density of 0.6 or less), with
pressure drops from line conditions of 500 psig or less and ambient temperature of 32 °F (0 C),
this pressure can be reduced in one cut at the sample point-- ideally with 10-15 psig at the input
of the conditioning system panel (SCS) with a second and final pressure regulator.
The sample should be supplied to the TFS analyzer at 10-15 psig and at a flow between 300-500
cc/min. A bypass sweep is recommended to reduce sample lag time in the sample line if it is at
high pressure or it is longer than 15 feet. The standard sample tubing material is 1/4” 316
stainless steel; however, 1/8” stainless steel tubing can be used if the response time is critical.
Carbon steel sample line and/or fittings are not acceptable.
Table 2: Sample Lag Time vs. Tubing Size
Tube
Size
(“)
Tube
Gauge
ID
(“)
ID
(cm)
Flow
(SCFH)
Flow
Std.
(cc/min)
Pressure
(PSIA)
Lag
Time
per 100’
(min)
Lag
Time per
100’ (sec)
3/8
20
0.319
0.810
5
2359
800
36.30
2178
3/8
20
0.319
0.810
5
2359
200
9.07
544
3/8
20
0.319
0.810
5
2359
50
2.27
136
1/4
20
0.181
0.459
5
2359
800
11.69
701
1/4
20
0.181
0.459
5
2359
200
2.92
175
1/4
20
0.181
0.459
5
2359
50
0.73
44
1/8
20
0.081
0.205
5
2359
800
2.34
140
1/8
20
0.081
0.205
5
2359
200
0.59
35
1/8
20
0.081
0.205
5
2359
50
0.15
9

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Sample Conditioning System (SCS):
The purpose of the SCS is to receive the sample from the sample transport system after first
stage pressure regulation and to perform the following functions:
Isolation from line conditions and the sample transport system. Block valves on each stream
Provide clean and dry Sample Sample filtration and sample bypass
Control Pressure Second stage sample pressure regulation Third stage carrier pressure regulation
Preserve the composition of the Gas Heat traced sample transport or integral heated SCS to
prevent heavier components from liquefying
Stream selection (in multi-stream applications)
Sample flow control and indication
Sample rotometer mounted after all stream switching
Figure 1: Typical TFS SCS

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Installation:
Unpack the analyzer and check for damage.
Ensure that the analyzer power supply and range are suitable for the application.
Check that the hazardous location rating is suitable for the installation location.
Select an installation location that is close to the sample point.
•Ensure that the selected installation site provides adequate room for
maintenance and repair
Bolt the analyzer to the wall or secure uni-strut to a solid surface.
Note: 3/8”x 1” bolts are recommended for installation.
Wire power, analog outputs, discrete inputs & outputs and communications to the TFS Analyzer.
CAUTION: Turn off power before servicing. Ensure breakers are off before
connecting or disconnecting supply power.
CAUTION: TFS-1, Seals Not Poured. Pour seals before energizing the circuit
(see APPENDIX B)
Tube the sample inlet(s), calibration inlet, sample sweep(s) and sample vent.
•1/4” 316 stainless steel tubing is recommended for the sample tubing
•1/8” 316 stainless steel tubing can also be used if the response time of the
analyzer is of particular concern
•All fittings in the sample and vent lines must be 316 stainless steel
•The vent line should be tubed in 3/8” stainless steel tubing to a maximum of 6’
•1/2” 316 stainless steel tubing should be used for vent lines exceeding 6’
CAUTION: Before resuming line pressure, be sure that all port
connections, sample sweep, and sample conditioning system are securely
installed.
1. Turn on sample pressure, ensure sweep is slightly open and set pressure to 15 psig.
α. Perform a Leak Test
CAUTION: All connections must be LEAKTIGHT to insure the
effectiveness of the analyzer as well as SAFETY.
The user, through their own analysis and testing, is solely responsible for the product
selection and ensuring all responsibility, safety and warning requirements of the
application are met. If the equipment is used in a manner not specified by Envent
Engineering Ltd., the protection provided by the equipment may be impaired.

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Customer Connections:
CAUTION: This unit requires a disconnect device rated 24 VDC and 5A max, must be
protected by a circuit breaker rated 24 VDC and 5 A max, and is to be installed in
accordance with local electrical codes.
CAUTION: Turn off power before servicing. Ensure breakers are off before connecting or
disconnecting supply power.
All customer connections are indicated on the circuit board.
Note: The 4-20 mA output requires 12 to 24 VDC loop
power.
Figure 2: Controller Board Layout & Power Input
Table 3: Customer Connection Summary (See Figure Above)
Application Positive Negative/Neutral Ground
AC L-H & F-H
hot
L-N & F-N
neutral
FG
DC L-H & F-H
+
L-N & F-N
-
N/A

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Serial Communication:
In order to communicate with a TFS-2 analyzer, plug into the USB port located to the right of the
mainboard.
Figure 3: TFS-2/TFS-YP USB Communication Connection
In order to communicate with a TFS-1, plug into the USB port located just behind the window.
Figure 4: TFS-1 USB Communication Connection

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Relay Outputs and Solenoid Driver:
Four relays are provided as status outputs, to drive external relays or solenoids. Envent
recommends use of the solenoid drivers for external loads. DO NOT supply external power to
solenoid drivers.
Four solenoid drivers provided to directly drive solenoids for shutdown, auto-calibration or stream
switching.
Unless otherwise specified the solenoid driver output is 24VDC.
Figure 5: Relay Outputs & Solenoid Drivers
TFS Analyzer Start-up and Operation:
The purpose of this procedure is to verify span accuracy upon installation of the TFS Analyzer.
This procedure is also performed at periodic intervals throughout the effective life of the
analyzer. This procedure has three parts: Warm-up, Zeroing, and Span Verification. Zeroing is a

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measurement on a zero (inert) gas. Span verification is a measurement on the customer’s trusted
certified mixture(s).
WARNING: DO NOT ZERO THE ANALYZER WITH SPAN CALIBRATION GAS:
USE NITROGEN or INSTRUMENT AIR ONLY
TFS Analyzer Warm-up:
After the TFS analyzer is powered on it requires a twenty min warm-up period. During this time
the display will show 100 Src% as well as any local alarms. These local alarms may include if so
equipped, Lo Temp, Lo Src% Com Fail, Status and Lo Pressure.
TFS DOES NOT REPORT PROCESS DATA DURING WARM-UP PERIOD.
During TFS warm-up the operator should take note of the Cell Temperature. Using Men/Scroll
button to scroll to Cell Temp on the TFS Display.Once the Cell Temperature reaches 60C the TFS
analyzer is now ready for the zero procedure.
THE TFS ANALYZER CELL TEMPERATURE MUST BE AT ~60C FOR MEASUREMENT OF
CALIBRATION OR PROCESS GAS. THIS IS SHOWN ON THE ANALYZER DISPLAY
Zeroing Procedure:
Before Starting the Zeroing Procedure the analyzer should be purged for 1hr with
Nitrogen or Instrument air. If the analyzer is being used to sample Acid Gas the
analyzer must be purged for 12hrs to pickle down H2S in TFS Sensor Cell
The TFS analyzer should be zeroed before measurement of process gas. The zeroing requires
either Nitrogen or
CLEAN instrument air. This TFS function can be initiated by the operator on
the local TFS display using the MENU/Scroll and LEFT OR RIGHT push buttons. If TFS1 use the
magnetic wand to operate the display cursor.
The operator should take note of the sample system operation before zeroing:
1. Turn the “Sample Inlet” valve 90 degrees on the SCS to stop the flow of process gas.
2. Source a cylinder of Nitrogen gas or Clean instrument air.
3. Connect appropriate pressure regulator to nitrogen cylinder.
4. Connect length of tubing from pressure regulator to the 3-way valve “Calibration Inlet”
port on the TFS Analyzer SCS.
Note: The “Calibration Inlet” port fitting can allow for 1/8 or 1/4 connection.
5. Turn the 3-way “Calibration Inlet/Process Gas valve 180 degrees towards the “Calibration
Inlet” port. This will allow calibration gas to flow to the TFS Analyzer.
6. Open the calibration cylinder main valve and set the pressure regulator to 15psi.
7. Set the TFS Analyzer flow meter to 4.0
8. The operator will then proceed to the local interface display to execute the Zero
Calibration
Figure 6 shows the menu screen displaying the “start zero” Command prompt:
Using the Menu/Set push button scroll the display until the start ZERO Cal is within the box
shown in Figure 6

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Figure 6: start Zero Cal Command
TFS Analyzer in Zero Cal Mode with LED-3 Illuminated
By pressing either the left or right push buttons the TFS Zeroing will start. There will be a two
minute purge time followed by LED# 3 on the lower part of the display lamacoid illuminating
green. This indicates that the TFS Zero Cal has started and will not be completed until the LED -
3 is not lit. The TFS will return to LED-1 which is the Process Stream when the Zero Cal is
completed. The component zero specification is up to (+0.03) This is baseline noise.
The time to complete the TFS Zero Cal will depend on the TFS Analyzer analysis time. By default
Zero Cal is done for five runs multiplied by the analysis time which is typically 60s or down to 10s
Once the LED-3 has gone out wait for 2 min before applying span gas or resuming
process gas. This is to allow the Precisive sensor to finish its zeroing and adjust its
baseline.
Span Verification:

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Due to the variety of sample system conditions and to ensure proper span verification
gas is being used it is recommended to consult the factory for support for this
procedure.
Ensure a suitable calibration gas and a clean stainless steel regulator with the correct CGA fitting
is available. Check that the regulator is rated for calibration cylinder pressure.
•Check the expiry date on the calibration gas bottle before using
•The recommended calibration gas supplier is Air gas or Air Liquide
Note: the following instructions apply to analyzers with standard sample systems;
however, the basic principles still apply.
Turn off sample gas flow using the 3-way “Calibration In” valve
1. Connect Span calibration gas bottle to the “Calibration In” valve
2. Set the calibration gas pressure to 15 psig and the flow meter to 4.0
3. Allow the analyzer reading to stabilize (10 to 15 minutes)
4. Verify the reading on the display. They should match the calibration gas concentration(s)
5. Turn on sample gas flow using the 3-way “Calibration In” valve
6. Set the sample gas pressure to 15 psig and the flow meter to 4.0
LCD Keypad Display:
CAUTION: The glass window on the TFS-1 must remain installed in order to ensure
area classification is maintained
To configure the TFS, if the area is non-hazardous, the window can be removed for basic TFS
operations available from the internal buttons or USB communication for complete TFS
operations available through ICE. The TFS-YP & TFS-2 are configured in the same manner.
Basic TFS operations are configured by using the push-buttons as shown below.
Figure 6: TFS Standard Operator Interface

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Table 4: Analyzer Display-button functions
Button
Description/Function
Bypass
Used to inhibit all analyzer alarms to a non-alarm state, and sets the
analog 4-20 mA output to 2 mA. The Bypass LED illuminates
when Bypass mode is enabled.
Scroll Right [ → ]
Used to move the cursor to the right. Also used to SAVE
configuration adjustments.
Scroll Left [ ← ]
Used to move the cursor to the left. Also used to CANCEL
configuration adjustments.
Menu/Set
Used to cycle through the menu options. Also used to increase
numerical values when making configuration adjustments

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Recommended Maintenance Schedule:
The TFS Analyzer is designed to be maintenance free for extended periods of time. Regular
check-ups will ensure that the analyzer is operating to specifications.
Recommended maintenance and operation verification of the analyzer consists of:
•Filter replacement (weekly to monthly depending on quality of sample gas)
•Re-zeroing should be done every three months with Nitrogen or clean instrument air
•Span Verification should be done yearly Spec is +/- 0.2% of full scale on all readings
•Light source replacement is required when the Lo Src% Alarm is indicating which means
the source is below 40% output. This is a reminder that the source will need to be
changed soon but not immediately.
Filter Replacement Procedure
It is recommended to replace the filter element when the pressure drop reaches 10 psig across
the filter.
Shut off the line pressure before changing elements. Ensure there is no pressure in the filter
housing.
Remove the bowl, element retainer and filter element.Replace Filter element with Bonded
Microfibre Coalescing Filter Element
Tightening the element retainer a ¼ to 1 turn after it first contacts the filter element securely
seals the filter tube. The amount will depend on the housing type and element size. A mark on
the end of the retainer can be used as a guide.
Before replacing the housing bowl ensure that the mating threads and sealing surfaces are clean
and damage free. It is recommended that the threads and sealing faces be lubricated with a
small amount of silicone grease before assembly. Stainless steel housings fitting with a solid PTFE
gasket the bowl should be tightened to a torque of between 30Nm and 40 Nm.
Before resuming line pressure be sure that all the port connections, the drain plug, and the
housing bowl are securely installed. All connections must be LEAKTIGHT to insure effective
filtration as well as SAFETY.
Fuse Replacement
 Insert new fuse in fuse holder cover
 Place fuse and cover into fuse holder body
 Install wire tie under fuse holder body and
over fuse Fuse holder cover
 Tighten wire tie to prevent unintentional fuse
removal
Figure 7: Fuse Installation

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Sample Conditioning System Cleaning Procedure:
During start-up or plant upset situations, the TFS analyzer may become
contaminated with amine or hydrogen sulfide scavenger solution. This may cause
the analyzer to read low (this can be determined at calibration). If the analyzer
reads low, it will require incremental increases in the gain to maintain calibration.
Please refer to factory calibration sheet for factory set gain factor. The scavenger
solution is water soluble and therefore is relatively easy to clean.
Material List: Cleaning kit part number: 330900
•Alconox Laboratory cleaner or equivalent residue free cleaning agent
•Fresh water
•100% Isopropyl Alcohol
•Large bucket to mix cleaning solution
•Rinse bottle
CAUTION: Do not use solvents, brake cleaner, soaps or detergents.
Procedure
1. Mix a 1% (2-1/2 tbsp per gallon) of Alconox in warm water
2. Sample line tubing
A. Shut off flow at the sample point prior to sample conditioning system
B. Flush the sample line and components with cleaning solution
C. Rinse with fresh water
D. Flush with isopropyl alcohol
E. Dry with clean, dry instrument air or gas
3. Sample conditioning system
CAUTION: Dis-assembly of the pressure regulator and solenoids in the field is
not advised. Consult the factory if the regulator or solenoid appears
contaminated.
Remove filter elements from filter housings and discard
A. Remove all sample conditioning system components and soak in cleaning
solution
B. Ensure valves are fully open when cleaning
C. Flush sample components with fresh water
D. Rinse with isopropyl alcohol
E. Blow dry with clean compressed air or fuel gas
F. If the any clear (Tygon) tubing appears discolored, replace the tubing
G. Tubing on humidifier should be replaced if it appears contaminated
4. Re-assemble Stainless Steel Tubing to analyzer according to analyzer drawing
5. Once sample conditioning system has been re-assembled ensure accurate readings from
dis