TAC H2S/H2O/O2 User manual

Table of Contents
Hydrogen Sulde, Water, Oxygen & Carbon Dioxide Analyzer
TAC-H2S/H2O/O2Analyzer Instruction Manual
www.tac-controls.com
TEXAS ANALYTICAL CONTROLS
4418 Bluebonnet Drive | Stafford, TX 77477
[phone]
PART 1 DEFINITIONS
PART 2 INSTALLATION
2.1 Safety Requirements
2.2 Mounting the Instrument
2.3 Sample Conditioning System
2.4 Electrical Connections
2.5 Communication Outputs
2.5.1 Optional Isolated 4-20 mA
2.6 Tubing Connections & Instructions
PART 3 START-UP & OPERATION OVERVIEW
3.1 Function of the Microprocessor
3.2 Typical Flow Diagrams
PART 4 OPERATION
4.1 Screen Display
4.2 Calibration and Start-up of the Analyzer
4.3 Calibrate Menu
4.3.1 H2S Calibration Menu
4.3.2 O2Calibration
4.4 H2S Sensor Settings Menu
4.5 H2S Bump Test
4.6 Alarm Settings Menu
4.6.1 H2S Sensor Saturation Alarm
4.6.2 Pump & Flow Fail Alarms
4.7 Analog-Out Settings Menu
4.8 RTU / Modbus Menu
4.8.1 Pin Outs
4.8.2 TCIP/ IP Menu
4.9 Data Logging Menu
4.10 OEM Settings Menu
4.11 Help Menu
4.12 Password Protection Feature
PART 5 MAINTENANCE
5.1 Occasional External Inspection
5.2 Replacing H2S Sensors
5.3 Replacing H2O Sensor
5.4 Replacing O2Sensor
5.5 Replacing Membrane Filter
5.6 Analyzer Enclosure Dimensions
PART 6 TROUBLESHOOTING
6.1 Frozen Screen – Run/Idle Mode
6.2 PLC Loses Program – Reload Program

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1 Denitions
ALARM DELAY: Time in minutes before the alarm
will activate.
ALARM LATCHING: Must manually acknowledge
to reset after reading has dropped below the set
point.
ALARM NON-LATCHING: Will automatically reset
when reading drops below set point.
COUNTS: A digital representation of current or
voltage. This PLC 20mA or 10VDC equals 32,000
counts.
PUMP FAIL: Insufcient or no clearing air
supplied by the pump to the analyzer.
FLOW FAIL: Insufcient or no sample gas ow to
the analyzer.
LOOP POWER: The device is passive and must
have a power source (DC voltage) in order to
operate.
SELF POWERED: The device is active and is
powered by the PLC with a DC voltage.
OVER-RANGE: Reading has exceeded the
maximum range of measurement.
H2S SENSOR SATURATION: Has absorbed the
absolute maximum and usually takes time to
dissipate (clear).
SENSOR FAIL: Did not have sufcient span to
calibrate for reliable readings.
SENSOR WEAK: Calibration has calculated sensor
is approaching fail condition and will soon need
replacement.
2 Installation
2.1 Safety Requirements
Operators are responsible for performing their own testing and analysis, as well as meeting all safety
requirements during installation and operation.
Safety Checklist
• Do not exceed 10 psig. This can damage the analyzer.
• Ensure that all connections are leak tight. This is important for analyzer effectiveness and safety.
• Before sampling, verify that the analyzer and sampling system are installed securely.
• Do not use any solvents or cleaners in the analyzer and sample-conditioning systems.
2.2 Mounting the Instrument
Mount the analyzer in shade. Strong, direct sunlight can overheat the instrument, causing improper
operation. If necessary, make a roof of some sort to shade the instrument. Use stainless steel tubing
(316 ¼″ O.D.) from the sample point to the analyzer, minimizing the distance to increase response time.
For proper function, apply a constant pressure of approximately 10 psig. Sample pressure may require
multiple pressure drops. You can purchase a sample-conditioning system from TAC.
NOTE: Sample plate must be mounted below the analyzer to keep liquids from reaching the analyzer.

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2 Installation
2.3 Sample Conditioning System
The sample-conditioning system ensures a clean, regulated sample for the analyzer. Sample-gas
composition and pressure, along with other factors, may require modifying the conditioning system
for a specic application. Mount the sample-conditioning system below the analyzer if possible. The
typical system may consist of a sample probe, drip pot, one or two regulators, and a membrane lter.
Some samples require an additional pressure regulator at the sample tap. One to three pressure drops
may be necessary to ensure that the analyzer receives a sample that is free of liquids. A typical system
is illustrated below.
NOTE: Conguration may be different pending the analyzer ordered.
Plate Dimensions: H=11" x W=7"
Sample In
(1/4" – not to exceed 400 PSIG)
PIPE LINE
3/8"
Sample
Out (1/4")
+ / -
+ / - + / -+ / -
+
FRONT VIEW
SAMPLE SYSTEM
to back
of panel
Important: To keep
liquids from reaching
the analyzer,sample
plate MUST be mounted
BELOW the analyzer.
Tip: Position the
solar panel as a sun
shade to prevent
glare on the PLC.
Ball Valve
(recommended)
Tubing
(client supplied)
Low Pressure In
Probe
(recommended)
Liquid Stop
Low
Pressure
Out
Membrane Filter
Tubing
(client supplied)
Needle Valve
(leave slightly open)

TAC-H2S/H2O/O2Pg. 4
TEXAS ANALYTICAL CONTROLS
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2 Installation
2.5.1 Optional Isolated 4-20 mA
An optional isolated 4-20 mA output is available,
offering linear users denable current output that is
proportional to the gas concentration. It typically is
connected to a recorder or similar instrument, such as an analog input to a remote SCADA unit.
The connections are labeled "+" and " - ". Its power is provided internally/self-powered. You can
purchase an isolated, loop-powered device (Part # FX-742) from Texas Analytical Controls.
2.4 Electrical Connections
The input power and the 4-20mA connections are in the analyzer’s enclosure. The power switch is in the
upper left-hand corner of the enclosure. Use it to recycle the power as needed.
If ordered, Alarm 1 and Alarm 2 are single-pole, double-throw, form C (dry contact– requires external
power). The contacts are rated for 2 amps at 125 volts AC and 4 amps at 30 volts DC. The customer
connection board includes three terminals for each relay: common (C), normally open (NO) and normally
closed (NC). These relays are fail-safe connected: When the analyzer is off or in an alarm condition, C and
NC are connected. When the analyzer is on, and no alarms are activated, C and NO are connected.
Each analyzer comes standard with an orange, 2 pin connector for ow fail signal. A 5 AMP fuse is
included to protect the analyzer from an overload. A spare fuse is also provided.
The analyzer draws approximately 1 amp, depending on its conguration. If the analyzer is powered
by solar panels, the size of the solar panel and battery is extremely important. If the analyzer’s power
requirements are not met, the controller may lose its program.
2.5 Communication Outputs
X7 Series analyzers come, standard, with a self-powered 4-20mA, Modbus via RTU serial port MJ1/2,
and RS232/485 via LAN. The Ethernet connector is used for the RS 232/485. Consult tech support to
change to the RTU port.
to back
of panel
BOTTOM VIEW
FRONT VIEW
NO C NC
+ / -
+ / -
12v DC
+
G
4-20 mA OUT
+ / -+ / -
POWER IN
L1 L2 G
RELAY FLOW FAIL
++++
OFF
ON
ETHERNET
5A
FUSE
SPARE
FUSE ETHERNET
PORT
STANDARD
IN
SAMPLE
IN
SAMPLE
VENT
SENSOR
VENT 1
SENSOR
VENT 2
Power / Communication
DI 03/15/23
Texas Analytical Controls Inc.
SHEET 1 of 1
TV REV - 1.0
PLEASE NOTE:
CONFIGURATION MAY BE
DIFFERENT PENDING THE
ANALYZER ORDERED
*NOTE: Unused hubs
should retain plastic
cap(s) securely in place
when not in use to keep
analyzer internals free
from bugs and dirt.
Remove Plastic
Cap(s) As Needed
Before Installation*
Power the instrument with a source that is not
likely to fail or to be accidentally turned off. The
analyzer will begin operating as soon as the power
is connected, drawing approximately 1 AMP at 110
VAC. Use at least an 18 AWG wire.
NOTE: Configuration may be different
pending the analyzer ordered.
For AC-Powered Units
• Use three wires.
• Connect them to the BLUE connector
labeled L1, L2, and GND.
For DC-Powered Units
• Use two wires.
• Connect them to the BLUE connector
labeled 12VDC or 24VDC.
• Red wire to "+," and black wire to "-").

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2 Installation
Sample In
• The sample to be analyzed enters the unit through the SAMPLE IN inlet.
• Use a regulator or probe in the sample line to maintain a constant pressure.
• The instrument’s accuracy drops when the inlet pressure varies. Therefore, we recommend
maintaining a constant pressure of 10 psig.
• The inlet pressure drives the sample through the instrument. The pressure should be high
enough to maintain the desired ow, yet low enough to reduce the accumulation of liquids in
the analyzer.
• The instrument allows the sample gas to ow continuously through the SAMPLE VENT outlet.
• Use 1/8″ tubing on inlet piping to speed response times.
Standard In
• The calibration standard is temporarily connected during analyzer calibration.
• A regulator with stainless steel tubing is required for calibration, as pictured in the
calibration section.
Sample Vent
• The sample sweeps through the instrument. Sample gas ows here at all times.
• Pipe the sample return to dispose of it wherever appropriate, depending on the sample.
• Remember: To keep it owing, the sample’s discharge point always must be at a lower
pressure than that of the sample inlet.
• To reduce back pressure, use pipe or tubing large enough to carry 2 SCFH of sample gas.
2.6 Tubing Connections & Instructions
The sample ows into the analyzer through the SAMPLE IN inlet
and sweeps out of the instrument through the SAMPLE VENT
outlet. The calibration and nitrogen standards are connected to
the analyzer through the STANDARD IN inlet. All analyzer in/
out connections occur through bulkhead ttings on the bottom
of the enclosure. These are compression (ferrule) ttings for
1/4-inch OD tubing. Connect all ttings as explained below. The
Sample Vent does not connect via tubing. Read and follow the
below instructions carefully, otherwise, the instrument may not
operate accurately.
BOTTOM VIEW
SAMPLE
IN
STANDARD
IN
SAMPLE
VENT
SENSOR
VENT 1
SENSOR
VENT 2
Bottom of Enclosure– conguration may be
different pending the analyzer ordered.

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3 Start-up & Operation Overview
Standard In
Sample In
For H2S Measurement
• The microprocessor controls three electric solenoid valves— two sensor valves and
one stop valve.
• The microprocessor allows an inert (air) portion of the unit to purge a sample line to
the sensor; this normally takes about 75 seconds.
• Next, the microprocessor activates the electric solenoid valve, which passes the
process gas over the sensor for approximately 15 seconds.
• The microprocessor records the reaction rate of the sensor to the process gas,
comparing it to the established rate of the calibration gas.
• The microprocessor then switches to Sensor 2 and repeats the above steps, averaging
the two sensor readings and displaying the averaged reading. This completes the
measuring cycle.
• During calibration, turn the manual valve from the sample stream to the calibration
standard. Each sensor is calibrated twice.
For H2O Measurement
• The analyzer uses 1 H2O sensor to provide a continuous reading.
• The analyzer has a built in temperature controller to maintain an internal temperature between
95˚ and 100˚ degrees F. The display will show when the heater is on.
• The H2O readings may require approximately 24-48 hours to read, accurately.
• This time delay varies depending on the length of the sample line, how long it takes for the
temperature controller to reach 95˚ degrees, and how long it takes for the residual moisture in the
gas lines to clear.
For O2Measurement
• The O2readings are continuous.
• During calibration, turn the manual valve from the sample stream to the calibration standard.
Texas Analytical Controls is constantly striving to make improvements to the programs used in our
analyzers. Depending on when your analyzer was purchased some of the features illustrated in our
manuals may or may not be included. For an updated program call TAC at 281-240-4160.
The analyzer uses a 7-inch touchscreen programmable logic controller (PLC), with a removable microSD
card that data logs and stores the TAC program.
We describe below what happens inside the instrument at various stages of operation. Because the
sensors are proprietary devices, we don’t describe their operation, but we do describe how the sensors
measure the H2S, H2O, O2and CO2 in a owing gas stream.
The current delivered by the H2S sensor is fed to an analog device, which converts it to DC voltage. The
voltage is delivered to a microprocessor that measures the H2S in the owing stream.
3.1 Function of the Microprocessor

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3 Start-up & Operation Overview
3.2 Typical Flow Diagrams
Typical H2S Flow Diagram
NOTE: Cal Valve not
required when analyzer
has a Manual Cal Valve.
Typical H2O Flow Diagram
Typical O2 Flow Diagram

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The Main Screen Displays:
• H2S/H2O/O2 readings
• ++++ signies it is in “over range/
sensor saturation”
• Gas specic alarm setpoints: When in alarm
mode, these are red
• Alarm delay
• SENSOR STATUS buttons
• Pump and ow conditions
• ACKNOWLEDGED button
4 Controls and Their Operation
To clear alarms and pump and
ow fail, press ACKNOWLEDGED
●● Green: OK
●● Yellow: Sensor Weak
●● Red: Fail
●● Red: H2S Saturation
●●Setpoints
change to red
and ashes
during alarms
4.1 Screen Display
After the analyzer is powered up, it displays warm-up screens, then the TAC address and phone number,
then the main screen. On subsequent screens, press the READINGS button at any time to return to the
main screen.
●●Sensor Weak = H2S sensors are approximately 75% used and
should be replaced soon
●●H2S Saturation = H2S levels exceed the analyzer’s range
●●H2O++++ Over Range = H2Olevels exceed 50 lbs
●●O2++++ Over Range = O2levels exceed 100 ppm
●●Red: ++++ Over Range

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4 Controls and Their Operation
4.2 Calibration and Start-Up of the Analyzer
The H2S portion of the analyzer does not require calibration
at start-up because it is calibrated at the factory. TAC
recommends calibration two weeks after gas is owing.
Calibration of the H2S portion is recommended monthly.
The 4-20 and alarms are inactive at start-up. The timer on
the main screen displays a countdown until they are active.
The timer is set for 5 minutes. The 4-20 and alarms also are
inactive during the calibration process and for 5 minutes after
calibration.
The H2O portion of the analyzer has also been calibrated at the
TAC factory. An external calibration standard is not required.
If the H2O readings need to be adjusted; the zero trim pot on
the front panel can be turned clockwise to increase the value
and counter-clockwise to decrease the value. If necessary, use
a H2O detection tube to verify the amount of H2O at the sample
point. Then adjust the zero pot on the front panel to match.
The O2 portion of the analyzer requires gas ow before you can
install and calibrate the sensor. The O2sensor is shipped in
a N2-lled bag. The main screen will read “++++ Over range.”
Pressing the O2Sensor Status button will reveal current
counts of approximately 32,000 = over range. Use pipeline
gas or a bottle of O2calibration gas to reduce the counts. (We
recommend pipeline gas because this step can take several
hours.)
Tips
• To return to the main screen,
press READINGS.
• To return to the menu screen,
press MENU.
• To show the trend, press TREND.
• Press the MENU button at any
time to return to the sub-screens.
• Press the READINGS button
at any time to return to the
main screen, showing current
readings.
The sensor status screens for H2S, H2O and O2 provide this information.
H2O TREND
SPAN ZERO
H2O ADJUST
O2 TREND

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4 Controls and Their Operation
The O2readings will begin to decrease. When they drop below 100 ppm, the analyzer no longer is over
range. Once the readings stabilize, calibrate the analyzer with O2calibration gas. (With a bottle of 25
ppm, the target counts should be approximately 8,000.)
Analyzers with 4-20mA Output:
If an analyzer displays “over range,” it will show ppm in the control room.
Analyzers with Ethernet via TCP/IP:
If an analyzer displays “over range,” it will show 99999 in the control room.
4.3 Calibrate Menu
4.3.1 H2S Calibration
To Calibrate H2S
1 From the menu screen, press the CALIBRATE button to enter the Calibrate menu screen.
2 From the CALIBRATE menu screen, press the CALIBRATE H2S BUTTON.
3 Verify or change the H2S-calibration standard as necessary.
Use the keypad to enter the correct value. Press Enter to save.
4 Press YES to start calibration.
5 Turn the manual calibration valve to STANDARD IN and conrm that
the ow meter drops to zero. (This conrms that the valves are switching properly.)
6 Connect the calibration bottle to the STANDARD IN port on the bottom of the enclosure.
3
4
+ / -
+ / - + / -+ / -
+
to back
of panel
STANDARD
IN
PSIG
OFF
SAMPLE
IN
SAMPLE
VENT
SENSOR
VENT 1
SENSOR
VENT 2
PSIG
OFF
FRONT VIEW
BOTTOM VIEW
Remove plug from
STANDARD IN
before attaching the
calibration bottle.
6
2
1
5
Tip: All the calibration
instructions can be found
by pressing the HELP
Menu button.
continues

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4 Controls and Their Operation
810
+ / -
+ / - + / -+ / -
+
to back
of panel
STANDARD
IN
PSIG
OFF
SAMPLE
IN
SAMPLE
VENT
SENSOR
VENT 1
SENSOR
VENT 2
PSIG
OFF
FRONT VIEW
BOTTOM VIEW
Remove plug from
STANDARD IN
before attaching the
calibration bottle.
9
To Calibrate H2S continued
7 Turn ON the calibration gas and adjust the ow meter to 1.0 SCFH.
8 Press YES to conrm. The display will ash “Calibration in progress.”
Each H2S sensor is calibrated twice. Afterward, the display reads
“Cal Complete.”
9 Turn OFF the calibration gas and turn the manual calibration valve
back to the SAMPLE IN position.
10 To return to the main screen, press the READINGS button.
4.3.2 O2Calibration
To Calibrate O2
1 From the CALIBRATE menu screen, press the CALIBRATE O2 button.
2 To verify or change the O2-calibration standard, press the ENTER O2 CALIBRATION button.
3 Use the keypad to enter the correct value. Press Enter to save.
4 The operator can read the calibration instructions while calibrating.
5 Press YES to start calibration. The screen will ash "O2 calibrating" during calibration.
6 Attach the calibration bottle to the Standard In, using a regulator with SS tubing or the Ralston SS tubing.
12
4
+ / -
+ / - + / -+ / -
+
to back
of panel
STANDARD
IN
PSIG
OFF
SAMPLE
IN
SAMPLE
VENT
SENSOR
VENT 1
SENSOR
VENT 2
PSIG
OFF
FRONT VIEW
BOTTOM VIEW
Remove plug from
STANDARD IN
before attaching the
calibration bottle.
6
3
5
continues
PSIG
ON
7

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4 Controls and Their Operation
To Calibrate O2 continued
7 Turn manual valve to STANDARD IN. Conrm that the ow-meter ball drops to zero. Turn on the
calibration gas and adjust the ow meter between 0.5 and 1.0.
8 Press the UP/DOWN buttons to adjust the counts. Press LOCK SPAN when current counts
approach 8,000 ppm (for a calibration standard of 25 ppm.) After pressing LOCK SPAN and saving,
the span count and current count will be roughly equal. The O2 reading and calibration gas should
each read 25 ppm.
Formula:
Max. Cts. / Full-scale range x Cal. Std. = Counts
(32,000 / 100) x 25 = 8,000
(32,000 / 100) x 50 = 16,000
Press the VERIFY CALIBRATION button. If the calibration was successful, the analyzer will display
“Calibration successful.”
9 Turn off the calibration gas bottle. Turn the manual calibration valve back to the SAMPLE IN position.
10 Press the Sensor Changed NO or YES button.
11 The PLC will return to the main screen. Press the SENSOR STATUS button.
12 The following screen will show the most recent calibration and sensor change.
10
11 12
8
7
+ / -
+ / - + / -+ / -
+
to back
of panel
STANDARD
IN
PSIG
OFF
SAMPLE
IN
SAMPLE
VENT
SENSOR
VENT 1
SENSOR
VENT 2
PSIG
OFF
FRONT VIEW
BOTTOM VIEW
Remove plug from
STANDARD IN
before attaching the
calibration bottle.
9

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4 Controls and Their Operation
4.4 H2S Sensor Settings Menu
The H2S Sensor-setting button enables you to turn on or off one of the H2S sensors, as well as adjust the
sample and clearing times. Do not change Clearing Time/Sample Time, etc., without consulting TAC tech
support.
If either H2S sensor is too weak to operate properly it can be turned off. The analyzer will continue to
operate on one H2S sensor.
4.5 H2S Bump Test
To verify the readings without removing the sample line, perform a bump test. The alarms and 4-20 are
disabled during the bump test, as well as for 5 minutes after its completion.
To Turn Off a Sensor
1 From the menu screen, press the H2S SENSOR SETTINGS button.
2 Press the respective sensor to turn it off.
3 The main screen will show, in red, that the sensor is off.
To Perform a Bump Test
1 From the menu screen, press the H2S BUMP TEST button.
2 Connect the calibration gas to the STANDARD IN port. (Do not turn on the bottle gas yet.)
3 Turn the manual calibration valve to STANDARD IN and conrm that the ow meter drops to zero.
4 Turn on the calibration bottle and adjust the ow meter to 1.0.
5 The display will ash "Bump Test in Progress", and the countdown will begin.
6 To abort the bump test, press the MENU or READINGS button.
7 The display should read the same as the calibration standard.
8 Turn off the bottle gas and return the manual valve to SAMPLE IN.
1
SENSOR 2
OFF
2 3 OFF
13
Standard In
Sample In
continued >
+ / -
+ / - + / -+ / -
+
to back
of panel
STANDARD
IN
PSIG
OFF
SAMPLE
IN
SAMPLE
VENT
SENSOR
VENT 1
SENSOR
VENT 2
PSIG
OFF
FRONT VIEW
BOTTOM VIEW
Remove plug from
STANDARD IN
before attaching the
calibration bottle.
2

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4 Controls and Their Operation
5BUMP TEST
IN PROGRESS
7
+ / -
+ / - + / -+ / -
+
to back
of panel
STANDARD
IN
PSIG
OFF
SAMPLE
IN
SAMPLE
VENT
SENSOR
VENT 1
SENSOR
VENT 2
PSIG
OFF
FRONT VIEW
BOTTOM VIEW
Remove plug from
STANDARD IN
before attaching the
calibration bottle.
8
6
MENU READINGS
MENU READINGS
Standard In
Sample In
PSIG
ON
4ON
OFF
4.6 Alarm Settings Menu
To Change the Alarm Settings
1 From the menu screen, press the ALARM SETTINGS button.
2 The alarm settings menu will be displayed. Select the button for the setting
you wish to change.
• Set/change the alarm setpoints.
• Set an alarm delay.
• Turn on or off the pump-ow or -fail warning.
• Set sensor saturation to latch or non-latch.
3 Use the keypad to enter the desired alarm setpoints and delays
and Press ENTER to save.
12 3
Tips
• Press the MENU
button at any time to
return to the alarm
settings menu.
• Press the READINGS
button at any time to
return to the main
menu screen.
H2S ALARM SETPOINT

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4 Controls and Their Operation
4.6.1 H2S Sensor Saturation Alarm
The default for sensor saturation is “latch.” Sensor saturation means the H2S levels exceed the
analyzer’s range. If the sensors are in saturation mode, the analyzer remains in clearing mode. The
sample bypasses the sensors until the operator presses the ACKNOWLEDGED button to clear the latch.
If the analyzer re-latches, it signies that the H2S levels remain higher than the range. The analyzer
may require purging.
Saturate mode can be changed to “non latch.” However, continuous saturations occurring in non-
latch mode may decrease sensor life. The analyzer may require recalibration.
During H2S sensor saturation, the main screen displays the following:
To clear alarms press
A C K N O W L E D G E D .
Flashes RED saturation
●●Changes to
Red and Flashes
During Alarms
To Change the Latch Setting
1 From the menu screen, press the ALARM SETTINGS button.
2 The alarm settings menu will be displayed. Select the H2S SENSOR SATURATION LATCHING button.
3 Press the UP/DOWN ARROWS to toggle between latched and non-latched. Press ENTER to save.
123
++++
H2S Reading is ++++
H2S ALARM
FAIL FAIL

TAC-H2S/H2O/O2Pg. 16
TEXAS ANALYTICAL CONTROLS
4418 Bluebonnet Drive | Stafford, TX 77477 | [phone] | www.tac-controls.com
4 Controls and Their Operation
4.6.2 Pump & Flow Fail Alarms
There are two pressure sensors in each analyzer; one for the
internal pump and one if the ow is obstructed to the analyzer.
The internal pump that clears the H2S sensors between cycles
typically lasts 3-5 years. If it fails, the main screen will ash
“PUMP FAIL.” If the sample ow is obstructed, the analyzer will
stop functioning and the main screen will ash “FLOW FAIL.”
If either fail alarm re-occurs, and you suspect a false failure,
the pump or ow fail switch can be adjusted. If the switch has been adjusted and the pump or ow fail
warning returns, then the pump or ow fail warnings can be disabled until the switch can be replaced.
During a pump or ow fail, the main screen displays the following:
Pump/Flow Fail Assembly – 12v or 24v
To Clear Flow Fail
1 Ensure that the regulators and ow meter(s) are
working properly.
2 Check that the sample line for obstructions and
clear them.
3 Press the ACKNOWLEDGED button on the main
screen to clear alarm.
To Clear Pump Fail
1 Touch the pump to verify that it is still vibrating
and, therefore, working properly.
2 Press the ACKNOWLEDGED button on the main
screen to clear alarm.
To Adjust the Pump or Flow Fail Sensor
1 Using a at head screwdriver turn the
potentiometer clockwise a ½ turn.
2 Press the ACKNOWLEDGED button on the
main screen to clear alarm.
3 Wait approximately 2 minutes to make sure
the ow or pump fail doesn’t return. Repeat the
process if necessary.
4 If the trim pot screw is bottomed out then the
switch will need to be replaced.
To Turn Off Fail Warnings
1 From the alarm setting menu, press the PUMP or
FLOW FAIL button to display the settings screen.
2 Press the UP/DOWN ARROWS to toggle between
“on” and “off” and press ENTER to save.
Tip: The following
instructions are also
available by pressing
the HELP button on
the menu screen.
FAIL FAIL

TAC-H2S/H2O/O2Pg. 17
TEXAS ANALYTICAL CONTROLS
4418 Bluebonnet Drive | Stafford, TX 77477 | [phone] | www.tac-controls.com
4 Controls and Their Operation
4.7 Analog-Out Settings Menu
To Change Analog-Out Settings
1 From the menu screen, press the ANALOG OUT SETTINGS button.
2 The analog output settings menu will be displayed. Pressing the desired buttons allows you to set/change
the 4-20 mA.
3 Use the keypad to enter the values and press ENTER to save.
4 Press the MENU button to return to the menu screen. Press the READINGS button to return to the main screen.
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The 4-20mA can be simulated to verify proper output
1 Press the SIMULATE ANALOG OUT button.
2 Press the H2O 4mA button.
3 Adjust your multimeter to mA mode.
4 The value you enter on the controller should match the display on the multimeter.
5 Press the MENU button to return to the menu screen. Press the READINGS button to return to the main screen.
H2O
4mA
50.0 LBS
4

TAC-H2S/H2O/O2Pg. 18
TEXAS ANALYTICAL CONTROLS
4418 Bluebonnet Drive | Stafford, TX 77477 | [phone] | www.tac-controls.com
Pin Signal Direction
1RX+/ TX+ IN/OUT
2RX-/ TX- IN/OUT
3CTS IN
4RTS OUT
5+5v 60mA* OUT
60V GROUND
7RXD IN
8TXD OUT
4 Controls and Their Operation
4.8 RTU/Modbus Menu
To Change the RTU/Modbus Settings
1 From the menu screen, press the RTU MODBUS button.
2 Turn MODBUS OFF when conguring settings. Press the desired button(s) to set/change the modbus settings.
3 Use the keypad to enter the values and press ENTER to save.
4 Press the MENU button to return to the menu screen. Press the READINGS button to return to the main screen.
4.8.1 Pin Outs
Tip: The Modbus
registers are also under
the HELP button.
12 3

TAC-H2S/H2O/O2Pg. 19
TEXAS ANALYTICAL CONTROLS
4418 Bluebonnet Drive | Stafford, TX 77477 | [phone] | www.tac-controls.com
4 Controls and Their Operation
4.8.2 TCIP/IP Menu
To Change the TCIP Settings
1 From the menu screen, press the TCIP MODBUS button.
2 Press the desired button(s) to set/change the settings.
3 Use the UP/DOWN ARROWS or keypad to enter the required data and press ENTER to save.
4 Press the MENU button to return to the menu screen. Press the READINGS button to return to the main screen.
To Change the Data-Logging Settings
1 From the menu screen, press the DATA LOGGING button.
2 Press the desired button(s) to set/change the settings.
3 Use the keypad to enter the required data and press ENTER to save.
4 Press the MENU button to return to the menu screen. Press the READINGS button to return to the main screen.
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4.9 Data-Logging Menu
The data-logging screen allows you to set the date and time, turn data logging on and off, and verify that
the SD card is inside the controller.

TAC-H2S/H2O/O2Pg. 20
TEXAS ANALYTICAL CONTROLS
4418 Bluebonnet Drive | Stafford, TX 77477 | [phone] | www.tac-controls.com
4 Controls and Their Operation
To Change the OEM Settings
1 From the menu screen, press the OEM SETTINGS button.
2 Enter the password and follow the steps.
3 Press the MENU button to return to the menu screen. Press the READINGS button to return to the main screen.
To Access the Help Menu
1 From the menu screen, press the HELP button.
2 The help screen provides the following information. Press each button for additional information.
3 For example, by pressing the FLOW FAIL ERRORS button the below troubleshooting information is available.
4.10 OEM Settings Menu
Approval by TAC tech support is required to enter this screen.
4.11 Help Menu
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