Detcon TP-524D-HRT User Manual

INSTRUCTION MANUAL

Detcon Model TP-524D-HRT

PGM 1

MODEL TP-524DHOUSTON,TEXAS

TM

MicroSafe H2S Gas Sensor

ALM ALM

FLT 1 2 CAL

PGM 2

TP-524D-HRT Hydrogen Sulfide Sensor

This manual covers the following ranges:

0-20ppm, 0-50ppm, and 0-100ppm

DETCON, Inc.

4055 Technology Forest Blvd, Suite 100,

The Woodlands, Texas 77381

Ph.281.367.4100 / Fax [phone]

www.detcon.com

March 10, 2014 • Document #3602 • Revision 0.3

This page left intentionally blank

Model TP-524D-HRT

Shipping Address: 4055 TechnologyForest Blvd, Suite 100, The Woodlands Texas 77381

Phone: [phone] • Fax: [phone] • www.detcon.com • [e-mail]

Model TP-524D-HRT ii

Mailing Address: P.O. Box 8067, The Woodlands Texas 77387-8067

Model TP-524D-HRT

Table of Contents

1. Introduction ..................................................................................................................................................1

1.1 Description.......................................................................................................................................... 1

1.2 Modular Mechanical Design............................................................................................................... 2

2. Installation....................................................................................................................................................4

2.1 Operational Guidelines for Safe Use .................................................................................................. 4

2.2 Sensor Placement................................................................................................................................ 4

2.3 Sensor Contaminants and Interference ............................................................................................... 5

2.4 Mounting Installation.......................................................................................................................... 6

2.5 Electrical Installation.......................................................................................................................... 7

2.6 Field Wiring........................................................................................................................................ 8

2.7 Initial Start Up..................................................................................................................................... 9

3. Operation....................................................................................................................................................11

3.1 Programming Magnet Operating Instructions................................................................................... 11

3.2 Operator Interface............................................................................................................................. 12

3.3 Normal Operation ............................................................................................................................. 14

3.4 Calibration Mode (AutoSpan)........................................................................................................... 14

3.5 Program Mode .................................................................................................................................. 16

3.5.1 View Sensor Status....................................................................................................................... 16

3.5.2 Set AutoSpan Level...................................................................................................................... 18

3.5.3 Set Range...................................................................................................................................... 18

3.5.4 Set Heater Power.......................................................................................................................... 19

3.5.5 Signal Output Check..................................................................................................................... 20

3.5.6 Restore Factory Defaults.............................................................................................................. 20

3.5.7 Alarm 1 and 2 Settings ................................................................................................................. 21

3.5.8 Fault Settings................................................................................................................................ 21

3.6 Program Features.............................................................................................................................. 22

3.6.1 Operational Features..................................................................................................................... 22

3.6.2 Fault Diagnostic/Failsafe Features ............................................................................................... 22

4. HRT Bridge................................................................................................................................................25

4.1 Description........................................................................................................................................ 25

4.2 Connecting the HRT Bridge ............................................................................................................. 25

4.3 Operation .......................................................................................................................................... 25

4.4 Operator Interface............................................................................................................................. 26

4.4.1 Device Menu................................................................................................................................. 26

4.4.2 Diagnostics Menu......................................................................................................................... 29

4.4.3 Device Setup Menu ...................................................................................................................... 30

5. Service and Maintenance............................................................................................................................37

6. Troubleshooting Guide...............................................................................................................................39

7. Customer Support and Service Policy........................................................................................................42

8. TP-524D-HRT Sensor Warranty................................................................................................................43

9. Appendix ....................................................................................................................................................44

9.1 Specifications.................................................................................................................................... 44

9.2 Spare Parts, Sensor Accessories, Calibration Equipment................................................................. 46

9.3 Revision Log..................................................................................................................................... 47

Model TP-524D-HRT iii

Model TP-524D-HRT

Table of Figures

Figure 1 Sensor Assembly Front View ................................................................................................................ 1

Figure 2 Circuit Functional Block Diagram......................................................................................................... 2

Figure 3 Transmitter Module ............................................................................................................................... 2

Figure 4 Field Replaceable H2S Sensor................................................................................................................ 3

Figure 5 Base Connector Board ........................................................................................................................... 3

Figure 6 Typical Outline and Mounting Dimensions........................................................................................... 7

Figure 7 Typical Installation ................................................................................................................................ 8

Figure 8 Sensor Connector PCB........................................................................................................................... 9

Figure 9 Magnetic Programming Tool............................................................................................................... 11

Figure 10 Magnetic Programming Switches...................................................................................................... 11

Figure 11 TP-524D-HRT Software Flowchart................................................................................................... 13

Figure 12 Primary Variables .............................................................................................................................. 27

Figure 13 Identification...................................................................................................................................... 28

Figure 14 Device Status Screen.......................................................................................................................... 29

Figure 15 FP Configuration Setup...................................................................................................................... 31

Figure 16 FP Calibration Screen ........................................................................................................................ 32

Figure 17 DVM Connection............................................................................................................................... 34

Figure 18 HART Setup....................................................................................................................................... 36

Figure 19 Replaceable H2S Sensor..................................................................................................................... 39

List of Tables

Table 1 Cross Interference Gases......................................................................................................................... 6

Table 2 Wire Gauge vs. Distance......................................................................................................................... 8

Shipping Address: 4055 TechnologyForest Blvd, Suite 100, The Woodlands Texas 77381

Phone: [phone] • Fax: [phone] • www.detcon.com • [e-mail]

Model TP-524D-HRT iv

Mailing Address: P.O. Box 8067, The Woodlands Texas 77387-8067

Model TP-524D-HRT

1. Introduction

1.1 Description

Detcon Model TP-524D-HRT hydrogen sulfide sensors are non-intrusive “Smart” sensors designed to detect
and monitor H2S in air. Ranges of detection are 0-20ppm, 0-50ppm, and 0-100ppm. The sensor features an
LED display of current reading, fault, and calibration status. The Sensor is equipped with a HRT Bridge
Interface, analog 4-20mA output. The HRT Bridge interface provides bi-directional digital communication
with HART®-enabled devices. A primary feature of the sensor is its method of automatic calibration, which
guides the user through each step via fully scripted instructions displayed on the LED display.

The microprocessor-supervised electronics are packaged as a plug-in replaceable Transmitter Module that is
housed in an explosion proof junction box. The Transmitter Module includes a four character alpha/numeric
LED used to display sensor readings, and the sensor’s menu driven features when the hand-held programming
magnet is used.

PGM 1

MODEL TP-524DHOUSTON,TEXAS

TM

MicroSafe H2S Gas Sensor

ALM ALM

FLT 1 2 CAL

PGM 2

Figure 1 Sensor Assembly Front View

Solid State H2S Sensor Technology

The sensor technology is a patented solid-state mixed metal oxide semiconductor.
The sensor consists of two thin films, a temperature sensitive heater film, and a
hydrogen sulfide sensitive sensor film. Both films are deposited on a silicon
microchip by vacuum deposition. The heater film elevates the operating
temperature of the sensor film to a level where a good sensitivity and response to
hydrogen sulfide is achieved. The sensor film is a proprietary mixed metal oxide
that shows an extremely stable and dynamic response to hydrogen sulfide gas.

Range of sensitivity is from parts per billion to percent by volume. The rugged
sensor is capable of maintaining its operating characteristics for periods of up to 7­10 years in most industrial environments and as such, is supported by a 10-year
conditional warranty.

TP-524D-HRT Instruction Manual Rev. 0.3 Page 1 of 48

Model TP-524D-HRT

RS-4854-

20mA

Display

Control

Pre-Amp

Power Supply

Principle of Operation

Method of detection is by diffusion/adsorption. Air and H2S diffuse through a sintered stainless steel filter
(flame arrestor) and contact the heated surface of the metal oxide sensor film. As hydrogen sulfide gas
molecules react with oxygen ions on the film, there is a decrease in electrical resistance proportional to the gas
concentration. The heater film elevates the temperature of the sensor film creating convection and promoting
a quick response to changing gas concentrations. Electronically, the heater film is used to maintain a constant
temperature of the sensor film enhancing stability and repeatability. The sensor response is reversible and
results in continuous monitoring of ambient air conditions.

1.2 Modular Mechanical Design

The Model TP-524D-HRT Sensor Assembly is completely modular and is made up of four parts:

1) TP-524D with HRT Brifge Plug-in Transmitter

2) Field Replaceable H2S Gas Sensor

3) Connector PCB

4) Splash Guard.

TP-524D-HRT Plug-in Transmitter

The Plug-in Transmitter Module is a microprocessor-based package that plugs into the connector board located
in the explosion proof junction box. Circuit functions include extensive I/O circuit protection, sensor pre­amplifier, sensor temperature control, on-board power supplies, microprocessor, LED display, magnetic
programming switches, and a linear 4-20mA DC output. Magnetic program switches located on either side of
the LED Display are activated via a hand-held magnetic programming tool, thus allowing non-intrusive
operator interface with the Transmitter Module. Calibration can be accomplished without declassifying the
area. Electrical classifications are Class I, Division 1, Groups B C D.

Plug-In

Sensor

Element

Temperature

Micro-

Processor

I/O

Circuit

Protection

Figure 2 Circuit Functional Block Diagram

PGM 1

HOUSTON,TEXAS

TM

MicroSafe H2S Gas Sensor

ALM ALM

FLT 1 2 CAL

PGM 2

Figure 3 Transmitter Module

Analog 4-20mA Out
HART Communication

Power In

TP-524D-HRT Instruction Manual Rev. 0.3 Page 2 of 48

Model TP-524D-HRT

Field Replaceable Sensor

The Detcon solid-state H2S gas sensor is a field proven, replaceable type sensor. It can be accessed and
replaced in the field by removing the wiring from the connector PCB, and unthreading the Sensor from the
junction box. The Detcon solid state H2S sensor has an infinite shelf life and is supported by a 10 year,
industry-leading warranty.

Figure 4 Field Replaceable H2S Sensor

NOTE: The Field Replaceable H2S Gas Sensor is constructed from 316 Stainless Steel in order to maximize
corrosion resistance in harsh environments.

Base Connector PCB
The base connector board is mounted in the Junction Box. The connector board includes Lug less terminal
connections for incoming power and MA output / HART Interface, and connections for the H2S Replaceable
Sensor.

Wiring to

Customer

Wiring

H2S Sensor

Figure 5 Base Connector Board

TP-524D-HRT Instruction Manual Rev. 0.3 Page 3 of 48

Model TP-524D-HRT

Note:

2. Installation

2.1 Operational Guidelines for Safe Use

1. Install sensor only in areas with classifications matching with those described on the approval label.
Follow all warnings listed on the label.

2. Ensure that the sensor is properly mounted in a vertical orientation with sensor facing down. Avoid
use of Teflon Tape, or any type of non-conductive pipe thread coating on the NPT threaded
connection.

3. Use ¾” NPT plugs properly rated for hazardous locations to block any unused connections

4. Removal of the Junction box cover or threaded sensor housing (399-800000-000) violates the Ex d
protection method and hence power must be removed from the sensor prior its safe removal.

5. Proper precautions should be taken during installation and maintenance to avoid the build-up of static
charge on the plastic components of the sensor. These include the splashguard and splashguard
adapter.

6. Do not operate the sensor outside of the stated operating temperature limits.

7. Do not operate the sensor outside the stated operating limits for voltage supply.

2.2 Sensor Placement

Selection of sensor location is critical to the overall safe performance of the product. Five factors play an
important role in selection of sensor locations:

(1) Density of the gas to be detected
(2) Most probable leak sources within the industrial process
(3) Ventilation or prevailing wind conditions
(4) Personnel exposure
(5) Maintenance access
(6) Additional Placement Considerations

Density

Placement of sensors relative to the density of the target gas is such that sensors for the detection of heavier
than air gases should be located within 4 feet of grade as these heavy gases will tend to settle in low lying
areas. For gases lighter than air, sensor placement should be 4-8 feet above grade in open areas or in pitched
areas of enclosed spaces.

H2S is heavier than air.

Leak Sources

The most probable leak sources within an industrial process include flanges, valves, and tubing connections of
the sealed type where seals may either fail or wear. Other leak sources are best determined by facility
engineers with experience in similar processes.

Ventilation

TP-524D-HRT Instruction Manual Rev. 0.3 Page 4 of 48

Model TP-524D-HRT

NOTE:

Normal ventilation or prevailing wind conditions can dictate efficient location of gas sensors in a manner
where the migration of gas clouds is quickly detected.

Personnel Exposure

The undetected migration of gas clouds should not be allowed to approach concentrated personnel areas such
as control rooms, maintenance or warehouse buildings. A more general and applicable thought toward
selecting sensor location is combining leak source and perimeter protection in the best possible configuration.

Maintenance Access

Consideration should be given to providing easy access for maintenance personnel. Consideration should also
be given to the consequences of close proximity to contaminants that may foul the sensor prematurely.

In all installations the gas sensor should point straight down (refer to Figure 7).

Improper sensor orientation may result in false readings and permanent sensor damage.

Additional Placement Considerations

The sensor should not be positioned where it may be sprayed or coated with surface contaminating substances.
Painting sensor assemblies is prohibited.

Although the sensor is designed to be RFI resistant, it should not be mounted in close proximity to high­powered radio transmitters or similar RFI generating equipment.

When possible mount in an area void of high wind, accumulating dust, rain, or splashing from hose spray,
direct steam releases, and continuous vibration. If the sensor cannot be mounted away from these conditions
then make sure the Detcon Harsh Location Dust Guard accessory is used.

Do not mount in locations where temperatures will exceed the operating temperature limits of the sensor.
Where direct sunlight leads to exceeding the high temperature-operating limit, use a sunshade to help reduce
temperature.

2.3 Sensor Contaminants and Interference

Solid State H2S sensors may be adversely affected by exposure to certain airborne substances. Loss of
sensitivity or corrosion may be gradual if such materials are present in sufficient concentrations.

The more common materials that potentially cause problems with the sensors are as follows:

Silicone vapors such as those found in greases and lubricants
Halide Compounds containing Chlorine, Chlorine Dioxide, Fluorine, HF, HCl, and Bromine
Caustic and Acid liquids and concentrated vapors
Heavy metals such as tetraethyl lead
Heavy and complex VOC gasses

The presence of such contaminants in an area does not preclude the use of this H2S sensor technology,
although it is likely that the sensor lifetime will be shorter as a result. Use of this sensor in these environments
may require more frequent calibration checks to ensure safe system performance.

Solid State H2S sensors require O2in the background gas and the reading is affected by changing O2levels.

Interference Data

TP-524D-HRT Instruction Manual Rev. 0.3 Page 5 of 48

Model TP-524D-HRT

NOTE:

NOTE:

NOTE:

There are some gases typically found in industrial environments that can cause a cross-interference response
on the sensor. See the Table below for some examples.

Table 1 Cross Interference Gases

GAS PPM GAS PPM

Methane 25,000 = 0 Ammonia 500 = 1
Ethane 5,000 = 0 Diesel Fuel 1000 = 0
Hexane 5,000 = 0 Dimethyl Sulfide 4.4 = 0
Propane 5,000 = 0 Ethylene 200 = 0
Butane 5,000 = 0 Freon 12 1,000 = 0
Carbon Monoxide 1% = 0 Hydrogen 5% = 0
Carbon Dioxide 5,000 = 0 Methyl Mercaptan 10 = 0
Carbon Disulfide 14 = 0 Sulfur Dioxide 300 = 0
Methanol 500 = 5 Toluene 32 = 0
Isopropanol 500 = 3 Ethanol 500 = 5

The Detcon MOS Sensor Cell can be damaged to the point of non-functioning if the
unit is left off power and in the presence normal air levels of moisture for periods exceeding 8
hours.

Always protect the sensor cell with the Detcon Sealing Cap and a fresh desiccant
packet when the sensor is powered off, this will avoid permanent sensor cell damage and help
preserve the span calibration.

2.4 Mounting Installation

The TP-524D-HRT should be vertically oriented so that the sensor points straight downward. The explosion­proof enclosure or junction box would then typically be mounted on a wall or pole (See Figure 6). Detcon
provides a selection of standard junction boxes in both Aluminum and Stainless Steel.

Do not use Teflon Tape or any other type of Pipe Thread material on the ¾” threads

unless the unit is mounted in a severe or harsh environment. Metal-on-metal contact must be
maintained to provide a solid electrical ground path. If Teflon Tape is used the Sensor must be
externally grounded using a ground strap.

When mounting on a pole, secure the Junction Box to a suitable mounting plate and attach the mounting plate
to the pole using U-Bolts. (Pole-Mounting brackets for Detcon Junction Box’s are available separately.)

TP-524D-HRT Instruction Manual Rev. 0.3 Page 6 of 48

6.125"

NOTE:

NOTE:

NOTE:

5.5"

PGM 1

MODEL TP-524DHOUSTON,TEXAS

3

NPT Ports

4

Model TP-524D-HRT

4.6"

6.45"

1

" mounting holes

4

TM

MicroSafe H2S Gas Sensor

ALM ALM

FLT 1 2 CAL

PGM 2

5.25"

8-32 tapped
ground point

H2S Sensor

Wall (or other

mounting surface)

2.1"

2"

Splash Guard

Figure 6 Typical Outline and Mounting Dimensions

2.5 Electrical Installation

The Sensor Assembly should be installed in accordance with local electrical codes. The sensor assemblies are
CSA/NRTL approved (US and Canada) for Class I, Division 1, Groups B, C, & D area classifications.

Proper electrical installation of the gas sensor is critical for conformance to Electrical Codes and to avoid
damage due to water leakage. Refer to Figure 7 and Figure 8 for proper electrical installation.

If a conduit run exits the secondary port, repeat the installation technique shown in

Figure 7.

In Figure 7, the drain allows H2O condensation inside the conduit run to safely drain away from the sensor
assembly. The electrical seal fitting is required to meet the National Electrical Code per NEC Article 500-3d
(or Canadian Electrical Code Handbook Part 1 Section 18-154). Requirements for locations of electrical seals
are covered under NEC Article 501-5. Electrical seals also act as a secondary seal to prevent water from
entering the wiring terminal enclosure. However, they are not designed to provide an absolute watertight seal,
especially when used in the vertical orientation.

A conduit seal is typically required to be located within 18" of the J-Box and Sensor

Assembly. Crouse Hinds type EYS2, EYD2 or equivalent are suitable for this purpose.

The Detcon Warranty does not cover water damage resulting from water leaking into

the enclosure.

TP-524D-HRT Instruction Manual Rev. 0.3 Page 7 of 48

Conduit

NOTE:

NOTE 1:

NOTE 2:

Model TP-524D-HRT

"T"

Drain

EYS Seal Fitting

PGM 1

MODEL TP-524D

HOUSTON,TEXAS

TM

MicroSafe H2S Gas Sensor

ALM ALM

FLT 1 2 CAL

PGM 2

Figure 7 Typical Installation

Any unused ports should be blocked with suitable ¾” male NPT plugs. Detcon
supplies one ¾” NPT male plug with each J-box enclosure. If connections are other than ¾”
NPT, use an appropriate male plug of like construction material.

2.6 Field Wiring

Detcon Model TP-524D-HRT solid-state H2S sensor assemblies require three conductor connections between
power supplies and host electronic controller’s 4-20mA / HART Interface. Wiring designations are DC+, DC­, MA (sensor signal). A 250 ohm load resistor is needed on the 4-20 mA line when it is not being used. The
maximum wire length between sensor and 24VDC source is shown in the Table below. The maximum wire
size for termination in the Junction Box is 14 AWG.

Table 2 Wire Gauge vs. Distance

AWG Wire Dia. Meters Feet

22 0.723mm 700 2080 3A
20 0.812mm 1120 3350 5A
18 1.024mm 1750 5250 7A
16 1.291mm 2800 8400 10A
14 1.628mm 4480 13,440 20A

Wiring table is based on stranded tinned copper wire and is designed to serve as a

reference only.

Shielded cable is required for installations where cable trays or conduit runs include
high voltage lines or other possible sources of induced interference. Separate conduit runs are
highly recommended in these cases.

Over-Current

Protection

TP-524D-HRT Instruction Manual Rev. 0.3 Page 8 of 48

NOTE 3:

The supply of power should be from an isolated source with over-current protection

NOTE 4:

NOTE

NOTE

as stipulated in table.

A 250 ohm load resistor is needed on the 4-20 mA line when it is not being used.

Terminal Connections

CAUTION: Do not apply System power to the sensor until all wiring is properly terminated. Refer

to Section 2.7 Initial Start Up

Customer

Wiring

Blue

Yellow

Black
White

Model TP-524D-HRT

Wiring to
H2S Sensor

Figure 8 Sensor Connector PCB

a) Remove the junction box cover and unplug the Transmitter Module. Identify the terminal blocks for

customer wire connections.

b) Observing correct polarity, terminate the 3-conductor 4-20mA field wiring (DC+, DC-, and MA) to the

sensor assembly wiring in accordance with the detail shown in Figure 8.

c) Trim all exposed wire leads if they are not permanently landed in the terminal block.

d) Plug the Transmitter Module into the connector PCB and replace the junction box cover.

: A 6-32 or 8-32 threaded exterior ground point is provided on most junction boxes for

an external ground. If the Sensor Assembly is not mechanically grounded, an external ground
strap must be used to ensure that the sensor is electrically grounded.

2.7 Initial Start Up

Upon completion of all mechanical mounting and termination of all field wiring, apply system power in the
range of 12-28VDC (24VDC typical) and observe the following normal conditions:

a) TP-524D-HRT display reads “0”, and no fault messages are flashing.

b) A temporary upscale reading may occur as the sensor heats up. This upscale reading will decrease to “0”

ppm within 1-2 minutes of power-up, assuming there is no gas in the area of the sensor.

: The 4-20mA signal is held constant at 4mA for the first two minutes after power up.

TP-524D-HRT Instruction Manual Rev. 0.3 Page 9 of 48

Model TP-524D-HRT

NOTE:

NOTE

NOTE

c) Remove the desiccant cap about 10 minutes after applying power to the sensor and install the

weatherproof splashguard accessory supplied with the sensor.

A desiccant cap with a desiccant packet is attached to the sensor cell housing during
storage and shipping. This prevents water from contacting the sensor film, and as a result helps
to retain the stability of the factory span calibration.

: Store the desiccant caps with the desiccant packets in a sealed container (i.e. zip-lock
bag) for future use. It is advisable (but not mandatory) to reinstall the desiccant cap and packet
during prolonged periods without power (more than 2 days is considered “prolonged”). An
active desiccant packet is blue in color and turns pink when consumed. (P/N 960-399800-000
Package of 10)

Initial Operational Tests

After a warm up period of 1 hour, the sensor should be checked to verify sensitivity to H2S gas.

Material Requirements

-Detcon PN 600-610000-000 Splash Guard with integral Cal Port -OR-

-Detcon PN 943-000006-038 Threaded Calibration Adapter

-Detcon PN 942-010112-025 Span Gas; 25ppm H2S in balance Air at fixed flow rate between 200 - 500cc/min
(10ppm for 0-20ppm range)

-Detcon PN 985-241100-321 In-Line Humidifying Tube

: Do not use H2S in Nitrogen background gas mixtures. This will cause significant
reading inaccuracies.

a) Connect the In-Line Humidifying Tube between the cal gas cylinder and the sensor. The humidifying tube

will introduce the ambient relative humidity into the Cal Gas as it passes through the tube.

b) Attach the calibration adapter to the threaded sensor housing. Apply the test gas at a controlled flow rate

of 200 - 500cc/min (200cc/min is the recommended flow). Allow 1-2 minutes for the reading to stabilize.
Observe that during the 1-2 minutes the display increases to a level near that of the applied calibration gas
value.

c) Remove test gas and observe that the display decreases to “0”.

Initial operational tests are complete. Detcon H2S gas sensors are factory calibrated prior to shipment, and
should not require significant adjustment on start up. However, it is recommended that a complete calibration
test and adjustment be performed 16 to 24 hours after power-up. Refer to span calibration instructions in
Section 3.4.

TP-524D-HRT Instruction Manual Rev. 0.3 Page 10 of 48

Model TP-524D-HRT

NOTE

3. Operation

3.1 Programming Magnet Operating Instructions

The Operator Interface of the Model 700 Series gas sensors is accomplished via two internal magnetic
switches located above and below the LED display (Figure 10). The two switches, labeled “PGM1” and
“PGM2”, allow for complete calibration and configuration, thereby eliminating the need for area de­classification or the use of hot permits.

Figure 9 Magnetic Programming Tool

The magnetic programming tool (Figure 9) is used to operate the magnetic switches. Switch action is defined
as momentary contact, 3-second hold, and 10-second hold. (Hold times are defined as the time from the point
when the arrow prompt “” appears.) For momentary contact use, the programming magnet is briefly held
over a switch location. For 3-second hold, the programming magnet is held in place over the switch location
for three seconds. For 10-second hold, the programming magnet is held in place over the switch location for
10 seconds. The 3 and 10 second holds are generally used to enter calibration/program menus and save new
data. The momentary contact is generally used to move between menu items and to modify set-point values.
Arrows (“” and “”) are used on the LED display to indicate when the magnetic switches are activated. The
location of “PGM1” and “PGM2” are shown in Figure 10.

Program 1

PGM 1

HOUSTON,TEXAS

MicroSafe H2S Gas Sensor

TM

ALM ALM

FLT 1 2 CAL

PGM 2

Program 2

Figure 10 Magnetic Programming Switches

: While in the Program Mode, if there is no magnetic switch interaction after 4

consecutive menu scrolls, the sensor will automatically revert to normal operating condition.
While changing values inside menu items, if there is no magnet activity after 3-4 seconds

the sensor will revert to the menu scroll.

(Exception to this is with “Signal Output Check” mode.)

TP-524D-HRT Instruction Manual Rev. 0.3 Page 11 of 48

Model TP-524D-HRT

3.2 Operator Interface

The operating interface is menu-driven via the two magnetic program switches located under the target marks
of the sensor housing. The two switches are referred to as “PGM1” and “PGM2”. The menu list consists of
three major items that include sub-menus as indicated below. (Refer to the complete Software Flow Chart.)

Normal Operation

Current Reading and Fault Status

Calibration Mode

AutoSpan

Program Mode

View Sensor Status

Sensor Model Type
Current Software Version
Range of Detection
AutoSpan Level
Days Since Last AutoSpan
Remaining Sensor Life
Sensor Heater Power
Sensor Heater Voltage
Raw Sensor Resistance
mA Output
Input Voltage Supply
Sensor Temperature
Alarm 1 Level
Alarm 1 Ascending
Alarm 1 Latching
Alarm 2 Level
Alarm 2 Ascending
Alarm 2 Latching
Fault Latching

Set AutoSpan Level
Set Range
Set Heater Power
Signal Output Check
Restore Default Settings
Alarm 1 Settings
Alarm 2 Settings
Fault Settings

TP-524D-HRT Instruction Manual Rev. 0.3 Page 12 of 48