Sierra Monitor Corporation 5100-06-IT, 5100-05-IT, 5100-04-IT, T12020, 5100-03-IT User Manual

MODEL 5100-XX-IT

IT Series

TOXIC GAS SENSOR MODULE

Version 2.0

APPLICABILITY & EFFECTIVITY

Effective for all Model 5100-XX-IT and 5100-XX-IT-SS Modules manufactured after March 1, 2008

including.

5100-03-IT
5100-04-IT
5100-05-IT
5100-06-IT

Instruction Manual Part Number T12020

Rev A

THIS PAGE INTENTIONALLY LEFT BLANK

Contents

TABLE OF CONTENTS

PRODUCT DESCRIPTION .............................................................................................................................1

1.

1.1 GENERAL........................................................................................................................................................1

1.2 PRODUCT CONFIGURATION........................................................................................................................1

1.3 THEORY OF OPERATION..............................................................................................................................1

1.4 MODES OF OPERATION................................................................................................................................1

1.4.1 SENTRY INTERFACE..............................................................................................................................1

1.4.2 MODBUS OPERATION............................................................................................................................2

1.4.3 ANALOG OPERATION ............................................................................................................................2

1.4.4 REMOTE SENSOR AND DISPLAY (APPENDIX D)................................................................................2

1.4.5 REMOTE ALARM RESET (DIGITAL INPUT) (Figure 3-7) ......................................................................2

1.4.6 OPTIONAL INTEGRAL RELAYS .............................................................................................................2

MECHANICAL ............................................................................................................................................................2

1.4.7 ENCLOSURE ...........................................................................................................................................2

1.4.8 TRANSMITTER ELECTRONICS .............................................................................................................4

1.4.9 SENSOR ASSEMBLY ..............................................................................................................................4

1.5 INTERCONNECT WIRING..............................................................................................................................4

1.6 POWER REQUIREMENTS .............................................................................................................................4

2. CAUTIONS & WARNINGS .............................................................................................................................5

2.1 INTRODUCTION .............................................................................................................................................5

2.2 IT MODULES - GENERAL ...............................................................................................................................5

2.3 WIRING............................................................................................................................................................5

3. INSTALLATION ..............................................................................................................................................7

3.1 SENSOR MODULE LOCATIONS....................................................................................................................7

3.2 WIRING............................................................................................................................................................7

3.2.1 ANALOG 4-20 mA OPERATION..............................................................................................................7

3.2.2 MODBUS OPERATION USING RS-485 CONNECTION ........................................................................7

3.2.3 SENTRY OPERATION USING SMC SENTRY CONNECTION ..............................................................7

3.2.4 GENERAL ................................................................................................................................................7

3.3 ENCLOSURE INSTALLATION........................................................................................................................8

3.4 TRANSMITTER AND SENSOR INSTALLATION ............................................................................................8

3.5 MODULE ADDRESS SWITCH ......................................................................................................................10

4. OPERATION .................................................................................................................................................17

4.1 INTRODUCTION – HUMAN-MACHINE INTERFACE SYSTEM ...................................................................17

4.2 HUMAN-MACHINE INTERFACE ..................................................................................................................17

4.3 MAIN MENU...................................................................................................................................................18

4.4 CONFIGURE SET-POINTS...........................................................................................................................19

4.5 MAINTENANCE FUNCTIONS.......................................................................................................................22

5. CALIBRATION..............................................................................................................................................24

5.1 CALIBRATION FREQUENCY .......................................................................................................................24

5.2 CALIBRATION PREPARATION ....................................................................................................................24

5.2.1 CALIBRATION GAS DELIVERY METHODS.........................................................................................24

5.3 CALIBRATION PROCEDURE.......................................................................................................................24

5.3.1 SENSOR EXPOSURE TO GAS.............................................................................................................25

6. SERVICE........................................................................................................................ ...............................26

6.1 SENSOR MODULE CONFIGURATION ........................................................................................................26

6.2 ENCLOSURE REPLACEMENT ....................................................................................................................26

6.3 TRANSMITTER REPLACEMENT .................................................................................................................27

6.4 SENSOR REPLACEMENT............................................................................................................................27

Contents

6.5 INSTALLATION INSPECTION ......................................................................................................................27

6.5.2 INSPECTION AND TROUBLESHOOTING GUIDE ...............................................................................28

6.5.3 IF MODULE DOES NOT RESPOND TO GAS ......................................................................................28

6.5.4 IF THE MODULE DISPLAYS “STARTING” FOR MORE THAN 1 HOUR .............................................28

7. APPENDICES ...............................................................................................................................................29

APPENDIX A - SPECIFICATIONS ...........................................................................................................................29

APPENDIX B: - MODEL NUMBERS & PARTS LIST ................................................................................................31

APPENDIX C: LIMITED WARRANTY ......................................................................................................................32

APPENDIX D: REMOTE SENSOR/DISPLAY DRAWING 5394-52..........................................................................33

APPENDIX E: MODBUS MEMORY MAP.................................................................................................................34

Contents

1. PRODUCT DESCRIPTION

1.1 GENERAL

The Model 5100-XX-IT Toxics Gas Sensor Module is a member of the Information Technology ”IT” family of

gas sensor transmitter modules. Members of the IT Toxics family include:

• 5100-03-IT Oxygen Deficiency Gas Sensor Module

• 5100-04-IT Carbon Monoxide Gas Sensor Module

• 5100-05-IT Hydrogen Sulfide Gas Sensor Module

• 5100-06-IT Chlorine Gas Sensor Module

IT modules offer a broad array of features, including:

• Integral alphanumeric LED display

• 180 day calibration frequency

• 4-20 mA output

• Modbus

• SMC Sentry interface

• 316 Stainless steel enclosure option

®

RTU interface

• Auxiliary integral relay option

• Remote display option

• Low maintenance and operation costs

IT modules are designed, and approved for installation and operation in hazardous locations.

1.2 PRODUCT CONFIGURATION

Various module configuration options are available. Where applicable, these options are factory configured
prior to shipment. Options which can be re-configured by the installer or field technician are fully described in
this manual.

1.3 THEORY OF OPERATION

Electrochemical sensors are fuel cell-like devices consisting of an anode, cathode and electrolyte. The
components of the cell are selected so a subject gas, allowed to diffuse into the cell, will cause a chemical
reaction and generate a current. The cells are diffusion limited so the rate the gas enters the cell is solely
dependent on the gas concentration. The current generated is proportional to the rate of consumption of the
subject gas in the cell.

1.4 MODES OF OPERATION

1.4.1 SENTRY INTERFACE

IT gas sensor modules can be installed on Sierra Monitor Sentry Model 5000 controllers. The gas sensor
module communicates as a toxic gas sensor module (Type 4 – communication) and are automatically
detected by the Sentry controller. When it is installed in a Sentry system the IT module must have a unique
address which can be established by setting an address between 1 and 8 on the Module Address Switch

®

Registered trademark of Schneider Electric

Page: 1

accessible from the cover plate as illustrated in Figure 3-1. Figure 3-6 in this manual provides the wiring
terminations for connections to the Sentry controller.

When the module is operated in conjunction with a Sentry controller, the alarms outputs in the module can
both be set to “Sentry”, allowing the Sentry controller to manage alarm acknowledge and reset rather than
the sensor module. The alarm relay outputs are triggered by the alarm values established in the module,
and can be independent of the settings in the Sentry controller.

The Sentry configuration allows daisy chain installation using the Sentry multiplex capability, thus reducing
costs by avoiding the requirement for wiring junction boxes. The connector card has two sets of

connections, allowing for a continuous run to the next module.

1.4.2 MODBUS OPERATION

An RS-485 Modbus RTU serial interface allows direct connection to standard PLCs and DCSs. The
Module Address Switch (section 3.5) allows the user to select up to 16 different Modbus addresses. Also,
an additional 238 Modbus addresses (for a total of 254 different Modbus Addresses) are available via
menu selection. Figure 3-6 in this manual provides the wiring terminations for Modbus connections. The
5100-XX-IT provides the additional terminal connectors to enable the user to connect In/Out terminations of
a RS-485 connection.

1.4.3 ANALOG OPERATION

The 4-20 mA interface allows direct connection to standard analog controllers or PLCs. The 5100-XX-IT 4­20 mA connection can be wired as a Type 3 (3-wire) or Type 4 (4-wire) circuit as described by ANSI/ISA-

50.00.01-1975 Standard (see figure 3-5).

1.4.4 REMOTE SENSOR AND DISPLAY (APPENDIX D)

The Remote Sensor and Display option (5394-52) can be used to remotely mount the sensor up to 100’
from the transmitter.

1.4.5 REMOTE ALARM RESET (DIGITAL INPUT) (Figure 3-7)

An input is available for connection of remote alarm reset/acknowledge. Figure 3-4 provides the wiring
termination for connecting the remote alarm reset. This only resets local alarms, not Sentry alarms. This
input can be wired as supervised or non-supervised.

Note that when the Remote Alarm Reset is operated in a supervised mode that both the switch and resistor
must be present as outlined in Figure 3-7.

1.4.6 OPTIONAL INTEGRAL RELAYS

The optional relays are integral to the gas sensor module and are rated as SPDT, 250VAC, 8 Amps for the
High Alarm and Low Alarm relays and SPDT, 250 VAC, 2 Amp for the Trouble relay.

If the gas sensor module is provided with the optional relays, it will include Terminal P4 on the interface
board (Figure 3-2). Relay output connections are on P4.

MECHANICAL

The sensor module of comprised of the following three primary components:

1.4.7 ENCLOSURE

Standard on the 5100-XX-IT is an explosion-proof, rain-tight cast aluminum electrical housing (Figure 1-1)
with three ¾” FNPT conduit hubs. The 5100-XX-IT-SS (Figure 1-2) has a 316 Stainless Steel enclosure.
Both enclosure covers have a viewing window. The design of the enclosure allows 3-way mounting choices
as shown in figure 1-3.

Page: 2

Model 5100-05-IT Toxic Gas Sensor Module – Aluminum Enclosures, Dimensions

Figure 1-1

Figure 1-2

Model 5100-05-IT Toxic Gas Sensor Module – 316 Stainless Steel Enclosures, Dimensions

.

Page: 3

Figure 1-3

Model 5100-XX-IT Toxic Gas Sensor Module – Mounting Options

1.4.8 TRANSMITTER ELECTRONICS

Electronic Assembly consist of one top transmitter board (connected to the cover plate) and on lower
interface board. Connectors for wiring for power, signal interface and alarm relays are located on the
interface board assembly

1.4.9 SENSOR ASSEMBLY

The sensor assembly includes an explosion proof housing containing the gas sensor and a wiring harness
for connection to the transmitter. The sensor assembly threads into one hub of the enclosure. The
exposed end of the sensor assembly is threaded to allow connection of a rain-shield or calibration gas
delivery fitting.

1.5 INTERCONNECT WIRING

Not supplied with the sensor module, but necessary to the installation and operation is the multi conductor
wiring which connects the module to its power source and controller. Before this wiring is installed it is
important to read and understand the control system installation instructions to determine wiring requirements
and alternatives.

1.6 POWER REQUIREMENTS

IT modules operate on DC power between 10 VDC and 30 VDC. Regulated DC power must be supplied from

a separate source, or from an approved Sentry or IT controller.

Page: 4

2. CAUTIONS & WARNINGS

2.1 INTRODUCTION

Although IT Transmitter Modules are designed and constructed for installation and operation in industrial

applications including "hostile" environments, caution should be taken to insure that the installation is made in
compliance with this instruction manual and that certain procedures and conditions are avoided. This chapter

discusses the necessary cautions. Read the entire chapter prior to installation of the equipment.

2.2 IT MODULES - GENERAL

Avoid installing sensor modules where they will be unnecessarily exposed to wind, dust, water (esp. direct
hose down), shock, or vibration. Observe temperature range limitations.

Sensors may be adversely affected by prolonged exposure to certain materials. Loss of sensitivity, or
corrosion, may be gradual if such materials are present in low concentrations. These materials include:
Halides (compounds containing chlorine, fluorine, bromine, iodine), acid vapors, caustic liquids or mists.

Care has been taken by the manufacturer to ship your modules in protective packaging to avoid contamination
prior to installation. It is recommended that the modules remain protected during installation and that the
covering be removed immediately prior to system start-up.

During normal use the sensor is protected from dirt and oil contamination by a sintered metal cover. If this
cover becomes clogged, the response of the sensor will be reduced. Protect the sensor from contamination
by careful placement, or by use of rain and dust shields.

Sensor modules must not be painted. Paint may contain compounds which will contaminate the sensor. Paint
will cause clogging of the sintered metal cover and will cause difficulties during attachment of the calibration
head or other maintenance activity. It is recommended that the module be tagged

2.3 WIRING

"DO NOT PAINT".

The manufacturer recommends that extra caution be taken where the installation is near any sources of
electromagnetic or radio frequency interference. Precautions include:

• Avoid running sensor module cable close to high power cables, radio transmission lines, or cables
subject to pulses of high current.

• Avoid running cables near large electric motors or generators.

• When the sensor module is to be operated in analog (4-20mA output) mode shielded cable is required.

• When the risk of interference is present use shielded cables. In conduit installations the shield should

be connected to the conduit. In cable applications the shield should be connected to the cable
connector.

• All splices must be via either a termination hardware system or soldered. Improperly spliced cable can
result in corrosion, resistance changes and system errors.

Installation and wiring must be in accordance with the National Electrical Code.

AC Voltage conductors are not to be run in the same conduit as DC voltage

NOTE

conductors.

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Page: 6

3. INSTALLATION

All modules are tagged to indicate the configuration including the sensor module number.

All IT modules are factory are pre-configured and calibrated.

Identify all components during unpacking and install using the factory configuration.

3.1 SENSOR MODULE LOCATIONS

NOTE

Select locations for each sensor modules based on the following:

• Modules should be placed close to the potential source of gas.

• Modules should be placed in areas accessible for calibration.

• Sensors should be pointed down and the conduit should include an inverse trap to reduce moisture

(condensation) from accumulating in the electronics enclosure.

• Remote calibration fitting (5360-00) should be used to facilitate calibration gas delivery. Run
polyurethane tubing (1/4” O.D. x 1/8” I.D.) from fitting to an accessible location.

3.2 WIRING

3.2.1 ANALOG 4-20 mA OPERATION

The 4-20 mA output for the 5100-XX-IT can be either 3-wire or 4-wire operation. If using 3-wire operation,
use a minimum of 18 AWG, shielded, 3-conductor cable up to 2000’. For 4-wire operation, use a minimum
of 2 each, 18 AWG, twisted, shielded, pair up to 2000’.

3.2.2 MODBUS OPERATION USING RS-485 CONNECTION

Use a minimum of 18 AWG, 2 conductor for DC power connection. No shield required. In addition use a
minimum of 24 AWG, low capacitance, shielded data cable for RS-485 half duplex communication. The
installation may be planned in a manner which provides up to 32 sensor modules on a single home run.

Refer to Figure 3-3 units ship with BIAS jumpers connected. For all installations, except very long cable
runs, these jumpers connected. The TERM jumpers should be installed in the last (furthest) module of
every loop.

3.2.3 SENTRY OPERATION USING SMC SENTRY CONNECTION

Wire shall be rated as 600 volt tray cable, such as Belden (or equivalent) 27331 or 27331 AS (shielded). If
high RFI or EMI levels exist wiring should be protected by conduit or shield. The installation may be
planned in a manner which provides up to 4 sensor modules on a single home run to a Sentry controller.

NOTE:

Be sure to follow all local electric code and safety requirements when installing the 5100-XX-IT Gas Sensor Module

3.2.4 GENERAL

Install conduit as required by local code or construction specifications. When sensor modules are to be
multiplexed for Sentry or RS-485 communication two alternatives may be planned:

• Install splice boxes above each sensor module. Use multi-position positive contact terminals to
connect daisy chain wiring and provide a pigtail to connect to the sensor module transmitter board.

Page: 7

NOTES

The drain wire of shielded cable must NOT be used as one of the conductors.

Installation and wiring must be in accordance with the National Electrical Code. Temperature

rating of cable wire must be at least 75oC. If cable runs through higher temperature

environments, it must be specified for that environment.

3.3 ENCLOSURE INSTALLATION

To protect the transmitter and sensor assembly they should be removed from the enclosure and preserved
until final installation and wiring termination.

Prior to installation and wiring.

1. Remove the transmitter from the module housing by:

• Unscrew the two captive panel screws in the face plate.

• Lift the transmitter out of the housing.

• Unplug the sensor cable from transmitter connector P2.

• Remove the sensor assembly from the enclosure hub.

2. Install the module housing onto the end of the supply conduit and/or bolt into position as required.

NOTES

When housing earth grounding is required for the installation a grounding lug is located in the

base of the enclosure. Install the earth ground wire under the green lug.

When installing the enclosure be sure to mount the FM Approved plate near the sensor

enclosure. This plate states “Caution: this area must be known to be free of flammable

concentrations prior to opening the enclosure.”

3.4 TRANSMITTER AND SENSOR INSTALLATION

When all pre-wire is complete:

1. Install sensor assembly in the open hub on the module enclosure. The sensor assembly thread
must be fully seated into the hub and tightened to maintain explosion proof assembly.

2. Connect the wires which return to the controller to interface board connectors P1, P2, P3 and P4
according to Figure 3-2.

3. Connect the sensor assembly cable to top transmitter board connector P2.

4. Align the headers between the top transmitter board and the lower interface board and push
together.

5. Turn rotary switch to correct sensor address.

The interface board should be wired to remote controllers first before installing the front

NOTE

transmitter board.

Page: 8

6. Carefully return the transmitter to the enclosure installing it over the two stand-off’s. Tighten the
retaining screws into the stand-offs.

P1 PCB Label Function

1 IN + Digital Input SW +
2
3 IN + 4-20 mA Input +
4
5 GND Ground
6 OUT + 4-20 mA Output +
7

P2 PCB Label Function

1 + RS 485 (+) (A)
2 - RS 485 (-) (B)
3
4 + RS 485 (+) (A)
5 - RS 485 (-) (B)
6

P3B PCB Label Function

1 P Power
2 S Signal
3 G Ground

P3A

4 P Power
5 S Signal
6 G Ground

P4 Connections are only available when the optional Relays are included

P4 PCB Label Function

1 N/C Low Alarm Relay NC
2 COM Low Alarm Relay COM
3
4 N/C High Alarm Relay NC
5 COM High Alarm Relay COM
6
7 N/C Trouble Alarm Relay NC *
8 COM Trouble Alarm Relay COM*
9
* Trouble relay is fail safe so it is energized for normal operation,
functions are labeled for normal operation.

Switch

IN - Digital Input SW -

4-20

4-20

RS 485

RS 485

LO ALM

HI ALM

TRBL
ALM

Sensor Module External Interfaces (See Figure 3-2)

IN - 4-20 mA Input -

OUT - 4-20 mA Output -

S RS 485 shield (Isolated GND)

S RS 485 shield (Isolated GND)

N/O Low Alarm Relay NO

N/O High Alarm Relay NO

N/O Trouble Alarm Relay NO*

Table 3-1

7. Establish the module address according to section 3.5.

NOTE

The starting delay period normally takes approximately 3 minutes but under some

circumstances can take longer.

Page: 9

3.5 MODULE ADDRESS SWITCH

For digital interface applications the module address switch (or Modbus node) must be set per Table 3-2:

POSITION ADDRESS POSITION ADDRESS

1 Sensor 1 9 Sensor 09

2 Sensor 2 A Sensor 10

3 Sensor 3 B Sensor 11

4 Sensor 4 C Sensor 12

5 Sensor 5 D Sensor 13

6 Sensor 6 E Sensor 14

7 Sensor 7 F Sensor 15

8 Sensor 8 0 Software

Menu

Table 3-2

Sensor Module Address Switch Positions

NOTE

For Sentry applications only sensor addresses 1-8 are allowed. If using Modbus output sensor

addresses 1-15 are available. Position 0 allows the Modbus Address to be set by software

menu, in the range 16-254.

Figure 3-1

Transmitter Face Plate

Page: 10

Interface Board Connectors

Figure 3-2

Figure 3-3

RS-485: 120 ohm termination not selected, BIAS shunted for 100K ohm bias

Page: 11

Figure 3-4

4-20mA Circuit Types

Page: 12

yp

4-20mA Circuit T

Figure 3-5
e Connections for 5100-XX-IT

Page: 13

For end of line,
refer to Figure 3-3

Figure 3-6

Wiring Connections for Modbus and Sentry Interface

Page: 14

P1

4-20

4-20

SWITCH

OUT

+

GND

- -

IN

+

-

IN

+

SWITCH IN

SWITCH IN

5100-05-IT REMOTE ALARM RESET (SUPERVISED)

+

-

4.7K OHM (CUSTOMER SUPPLIED)

Figure 3-7

Wiring Connections for Remote Alarm Reset

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Page: 16

4. OPERATION

/

\

\

/

–

4.1 INTRODUCTION – HUMAN-MACHINE INTERFACE SYSTEM

The Gas Sensor Module utilizes a visual menu system operated by means of a magnet. A magnetic tool
(5358-50) is supplied for this purpose. The menu system is used to configure alarm set-points, calibrate the
sensor module, and for maintenance procedures and alarms acknowledge.

4.2 HUMAN-MACHINE INTERFACE

The module menu system is operated by means of directing the magnet stick toward each of four independent
hall-effect magnetic switches. Each switch functions as if it is a manually activated panel key. The keys are
located above and below the faceplate display and are labeled
key functions are as follows:

M , E , ▲ and ▼ as shown in Figure 4-1. The

• Key

M : MODE

• Key E : ENTER

• Key ▲: UP (+)

• Key ▼: DOWN (-)

Key M

Key

IT Module

Figure 4-1:

Menu Switch Locations

Key E

Key

Page: 17

4.3 MAIN MENU

Table 4-1 describes the primary man-machine interface operation.

Function Display Description Reference

Key

M E

ST

M E

ST

ME

S T

ME

S T

Mode Switch [M]

Enter Switch [E]

Up Switch [▲] Previous Menu

Down Switch [▼] Next Menu

5100-XX First screen at power up: Model No.

VXX-XX-- Second screen at power up: Version No.

STARTING Third screen at start up: Starting Delay

XXXPPM Normal condition - default display

M E

ST

M E

ST

Mode ALMRSET: Mode Function - Alarm Reset

Banner: "Press [E] to reset alarm"

RESET Alarm Reset

XXXPPM Default Display

M E

ST

M E

ST

M E

ST

M E

ST

M E

ST

M E

ST

Mode ALMRSET: Mode Function - Alarm Reset

Mode CALIB:-- Mode Function - Calibrate Table 5-1

Mode SETUP:-- Mode Function - Set Point Adjustments Table 4-3

Mode MAINT:-- Mode Function - Maintenance Table 4-4

Mode EXIT-?-- Exit Menu

Enter XXXPPM Apply Selected Mode (Exit)

XXXPPM Default Display

(Once a minute the sensor displays module address)

Table 4-1 Master Menu

Table 4-2 describes the operational display values of the human-machine interface system.

DISPLAY DESCRIPTION

STARTING

XXX PPM

LXXXPPM

HXXXPPM

Delay from loss of power at start-up

Concentration

Low Alarm

High Alarm
Measures gas, concentration exceeds

CXXXPPM

100% to Full Scale
Calibration Mode

Acknowledged Function

Table 4-2 Operation Display Values

Page: 18

Model 5100-XX-IT Toxic Gas Sensor Module

4.4 CONFIGURE SET-POINTS

The sensor module set-points menu is used to initially set-up the alarm set points, relay actions, gas type and
range, 4-20 mA action and RS-485/Sentry address and baud rates.

• Alarm Set-points: Once the Set-up menu is selected, press [E] to activate the Alarm Set-point

screen. Use the [▲] or [▼] keys to select Low Alarm or High Alarm menu. Key [▲] will adjust the
setpoint upwards and Key [▼] will adjust the value downwards. Once it reaches the desired
setpoint, Key [E] will accept it and ACK will appear.

Set-points can be configured using this menu up to the following values:

5100-03-IT O
5100-04-IT C0
5100-05-IT H
5100-06-IT Cl

19.5%

2

500 PPM

S 20 PPM

2

5 PPM

2

• Alarm Relay Set-up: Once the Set-up menu is selected, press key [▼] once and press [E] to

activate the Relay Set-up menu. Use the [▲] or [▼] keys to select High Alarm or Low Alarm relay
menu and press [E]. Use the [▲] or [▼] keys to select the correct alarm relay action for the
application, Latch, Sentry or Non-Latch. Selecting “Sentry” enables the Sentry controller to make all
alarm action decisions. * indicates the current selection.

• Range: Once the Set-up menu is selected, press key [▼] twice and press [E] to activate the Range

Set-up menu. Use the [▲] or [▼] keys to select Range menu and press [E]. When “Range” is
selected menu provides any choices of ranges available for the gas type selected. Use the [▲] or
[▼] keys to select the desired range. If the “User” range is selected, use the [▲] or [▼] keys to
adjust the high end of the range desired.

• 4-20mA: Once the Set-up menu is selected, press key [▼] three times and press [E] to activate the

4-20mA Set-up menu. Use the [▲] or [▼] keys to select Calib or CalibOut menu and press [E].
The “Calib” section of the menu allows the user to calibrate the 4 mA and 20 mA outputs. To
calibrate the 4 mA and 20 mA outputs it is necessary to have an amp meter connected to the 5100­XX-IT and upon selecting the 4 mA output calibration then the [▲] or [▼] keys can be used to adjust
the 4 mA reading on the amp meter until it reads 4 mA. Similar steps can then be performed for the
20 mA output. The CalibOut section allows the user to select the 4-20 mA output action desired
during calibration. * indicates the current selected value. Available selections include:

 Track – the 4-20mA value tracks the calibration gas exposed to the gas sensor module
 Zero – the 4-20mA value is held at 0mA during calibration
 C1.50mA – the 4-20mA value is held at 1.50mA during calibration
 C4.00mA – the 4-20mA value is held at 4.0mA during calibration.

• RS-485 - Once the Set-up menu is selected, press key [▼] four times and press [E] to activate the

RS-485/Sentry Set-up menu. Use the [▲] or [▼] keys to select Address or Baud rate menu and
press [E]. Note that the 5100-XX-IT has a rotary switch on the faceplate and it is used to select
addresses 1-15. When connected to Sentry the user can select 1-8 and using Modbus RS-485 the
user can select addresses 1-15. For Modbus addresses above 15, set the rotary switch to 0 and
then use the “Address” menu to select any address between 16 and 254. The Baud rate menu
allows the user to select a baud rate of 38400, 19200, 9600, 4800 or 2400. * indicates current
selection.

Page: 19

Model 5100-XX-IT Toxic Gas Sensor Module

Function Display Description Reference

Key

--0%LEL- Default Display

M E

ST

M E

ST

M E

ST

M E

ST

ME

S T

ME

S T

ME

S T

ME

S T

M E

ST

M E

ST

ME

S T

M E

ST

Mode ALMRSET: Mode Function - Alarm Reset

Mode CALIB:-- Mode Function - Calibrate

Mode SETUP:--- Mode Function - Set Point Adjustments

Enter Alarms S.P. Function - Alarm Adjust * A Below

Down Relays S.P. Function - Relays Adjust * B Below

Down Gas S.P. Function - Range Adjust * Page 21

Down 4-20mA S.P. Function - 4-20 mA Adjust * Page 21

Down RS-485 S.P. Function - RS-485/Sentry Output Adjust * Page 21

High Alarm Set Point Adjustment Example

Enter H.Alarm S.P. Function - High Alarm Adjust *A

Enter HASP:60- High Alarm Set Point: current = 60

Use S or T keys to adjust to new set point

Down (x5) HASP:55- High Alarm Set Point: new = 55

Enter ACK Momentary Acknowledge of new Set Point

H.Alarm S.P. Function - High Alarm Adjust

M E

ST

ME

S T

M E

ST

ME

S T

ME

S T

Relays Set Point Adjustment Example

Enter H. Relay S.P. Function - High Alarm Relay Adjust *B

Down L.Relay S.P. Function - Low Alarm Relay Adjust

Enter Latch

Down Sentry

Use S or T keys to adjust to new relay action
(Latch, Sentry, NonLatc) * indicates current
NOTE: Sentry indicates that Sentry controls relay
action and not the IT Sensor Module

Down *Sentry High Alarm Relay set to Sentry

Table 4-3A Set-Up Configuration

Page: 20

M E

ST

M E

ST

ME

S T

ME

S T

M E

ST

M E

ST

M E

ST

M E

ST

M E

ST

M E

ST

ME

S T

M E

ST

M E

ST

M E

ST

M E

ST

M E

ST

M E

ST

ME

S T

M E

ST

Model 5100-XX-IT Toxic Gas Sensor Module

Gas Range Adjustment Example

Enter Range S.P. Function - Range Adjust *C

Enter *100 PPM

Down 10 PPM Press [E] if selecting 0-10 PPM range

Down USER Press [E] if selecting User adjustable range

Enter 100 PPM

Enter Calib S.P. Function - Calib Adjust *D

Enter Out: 4mA Use S or T keys to select 4 mA or 20mA

Enter 4mA Selects 4 mA

Enter ACK Momentary Acknowledge of new Set Point

Mode Calib S.P. Function - Calib Adjust

Down CalibOut S.P. Function - Output during Calibration Adjust

Enter Track Use S or T keys to select Track, Zero, C1.50mA, C4.00mA

Enter *Track * = Current selection

Enter Address S.P. Function - RS-485 Address Adjust *E

Enter Addr:016 Use S or T keys to enter new address

Enter ACK New address selected

Enter Address S.P. Function - RS-485 Address Adjust

Down Baud S.P. Function - RS-485 Baud Rate Adjust

Enter *38400 Press [E] to select or [S] or [T] to select another

Select [E] to select or S or T to select another and
press [E]

Select [E] to select or S or T to select another and
press [E]

4-20 mA Adjustment Example

Track = Output during calibration tracks the calibration gas,
Zero = Output is Zero during calibration,
C1.50mA = Output during calibration is 1.50 mA, C4.00mA =
Output during calibration is 4.0 mA

RS-485 Adjustment Example

Table 4-3B Set-Up Configuration

Page: 21

Model 5100-XX-IT Toxic Gas Sensor Module

4.5 MAINTENANCE FUNCTIONS

The maintenance menu enables the operator to view sensor and software versions. Sierra Monitor technical
support has access to other values as needed.. The maintenance menu operation is described in Table 4-4.

Key

Function Display Description Reference

XXXPPM Default Display

M E

ST

M E

ST

M E

ST

M E

ST

M E

ST

M E

ST

Mode ALMRSET: Mode Function - Alarm Reset

Mode CALIB:-- Mode Function - Calibrate

Mode SETUP:- Mode Function - Set Point Adjustments

Mode MAINT:-- Mode Function - Maintenance

Enter Ver1.00aA Module Software Version Number

Enter CCC001 Module Custom Configuration Control number

Table 4-4

Maintenance Menu

Page: 22

Model 5100-XX-IT Toxic Gas Sensor Module

THIS PAGE INTENTIONALLY LEFT BLANK

Page: 23

Model 5100-XX-IT Toxic Gas Sensor Module

5. CALIBRATION

5.1 CALIBRATION FREQUENCY

The 5100-XX-IT has been calibrated in the factory prior to shipment. It is recommended that the user check
calibration before placing in service. The toxic sensor module must be calibrated every six months. Periodic
functional tests are advisable for critical applications and hostile environments.

The sensor module microprocessor software includes high level self checking algorithms which provide
continuous sensor diagnostic and self adjustment. Users may elect to increase calibration periods based on
low drift experience during the first two calibration periods.

5.2 CALIBRATION PREPARATION

Calibration of the Toxic Gas Sensor Module is accomplished by simple menu based steps and application of
span gas.

If an error is made during any stage of the calibration process, hold the magnet stick at the

Switch [M] for 10 seconds. A scrolling display will indicate “Calibration aborted” and the

sensor module will exit the calibration activity and return to normal operating mode. The

calibration procedure can then be restarted

NOTE

Calibration must be performed only when the area is known to be clear of the applicable toxic gas. If
necessary, use a portable instrument to confirm that there is no background toxic gas.

For compliance with Factory Mutual (FM) Apparatus, the Sierra Monitor Model 1250-01, 1256-01, 1260-XX are
the only FM Approved calibration gas delivery device. Use Model 5358-00 or 5358-01 Calibration Adapter or
Model 5360-00 Gas Delivery Fitting.

5.2.1 CALIBRATION GAS DELIVERY METHODS

Calibration gas is can be delivered to the sensors via the following delivery devices:

Model 5358-00: Calibration Adapter - used with portable calibrators. See 5-1.

Model 5360-00: Calibration Gas Delivery fitting - permanently installed fitting which
allows tubing to be run to a convenient delivery location

5.3 CALIBRATION PROCEDURE

Table 5-1 shows the step by step process of the calibration procedure.

The procedures requires that the menu “keys” be activated using the magnet stick.
Each key press steps through the process of setting the zero value for clean air and
then setting the span value.

At each of these steps, apply calibration gas of the value corresponding to the
setting accepted on the sensor module display.

Page: 24

Sample Gas In

Figure 5-1

Model 5358-01 Calibration

Adapter

Model 5100-XX-IT Toxic Gas Sensor Module

-

5.3.1 SENSOR EXPOSURE TO GAS

Calibration gas must be delivered to the sensor using the flow rate and duration listed in below:

Model Gas Flow Period

5100-03-IT Oxygen 300 cc/min Until Stable
5100-04-IT Carbon Monoxide 300 cc/min Until Stable
5100-05-IT Hydrogen Sulfide 300 cc/min Until Stable
5100-06-IT Chlorine 300 cc/min Until Stable

Key

Function Display Description Reference

XXXPPM Default Display

M E

ST

M E

ST

M E

ST

M E

ST

M E

ST

M E

ST

Mode ALMRSET: Mode Function - Alarm Reset

Mode CALIB:--

Enter

AL-0PPM-

Mode Function - Calibrate

Banner: Apply zero gas, enter <E> when done

Operation: Confirm area clear of gas, or apply zero air to
sensor.

Enter ACK Zero gas setting acknowledged

Banner: Select span, enter <E> to calibrate sensor

Banner: Apply span gas, then enter <E> to calibrate gas sensor

Operation: Apply calbrat i on gas.
Operation: As gas is applied the reading will increase - wait 3

minutes

Enter

10PPM-SP

C 4 PPM

C 4 PPM

CXXXPPM

Enter CAL-OK Calibration Passed - now remove gas

WAIT-300

Operation: Five minute time out bef o re sensor is returned to
service.

Sub-Routines

Sub A

Sub B

ME

S T

ME

S T

M E

ST

M E

ST

M E

ST

M E

ST

10PPM-SP

Up 25PPM-SP

Up Adj-SPAN

Enter 25PPM-SP

Enter C 25PPM

C 25PPM

Enter CAL-FAIL

WAIT-300

Mode

(Any)

XXXPPM Default Display

Banner: Select span, enter <E> when done

Operation: Change Span Gas Value t o 25PPM
Operation: User adjustable value
Operation: Ready for user adjus tment

Banner: Apply 25PPM gas, then enter <E> to calibrate gas
sensor

Operation: Apply calbrat i on gas.
Operation: No calibration gas appl i e d, or sensor did not respond

correctly.
Operation: Five minute time out bef o re sensor is returned to

service.
Operation: Hold magnet over Mode Switch for ten senconds t o
abort calibration

Banner: Calibration Aborted

Table 5-1

Calibration

Page: 25

Sub A

Sub B

Sub C

Model 5100-XX-IT Toxic Gas Sensor Module

6. SERVICE

6.1 SENSOR MODULE CONFIGURATION

The gas sensor module is comprised of the following sub-assemblies (Figure 6-1):

5100-XX-IT Gas Sensor Module

SPL21810 Aluminum Enclosure (SPL32178 316SS Enclosure)
SPL21825 Transmitter Assembly
XXXXXXX Sensor Assembly (See Appendix B)
5200-XX-IT Sensor (See Appendix B)

6.2 ENCLOSURE REPLACEMENT

Figure 6-1

Module Components

Page: 26

Model 5100-XX-IT Toxic Gas Sensor Module

The enclosure should be replaced if the cover threads or conduit threads have been damaged, or if the
enclosure has been damaged sufficiently that it no longer meets the required NEMA classification.

To replace the enclosure follow the transmitter and sensor assembly removal instructions, remove the
damaged enclosure from its conduit, install a new enclosure and replace the transmitter and sensor assembly.

6.3 TRANSMITTER REPLACEMENT

The transmitter assembly should be replaced when it is determined that it is unreliable, noisy or cannot be
adjusted for calibration. This may occur due to age, corrosion or failed components.

To replace the transmitter assembly:

a. Remove the cover of the main enclosure
b. Unscrew the two thumb screws in the top of the cover plate, lift the assembly and rotate 90

wiring service loop
c. Unplug the sensor connector from the transmitter
d. Plug connector into new transmitter (be sure to match numbers between connector and socket).
e. Restore power and allow a minimum of 3 hours for stabilization before re-calibration

6.4 SENSOR REPLACEMENT

The gas sensor which is located inside the sensor assembly housing can be replaced without replacement of
the housing. The gas sensor needs replacement when:

 The “CAL-FAIL” message appears after calibration
 The sensor output signal is noisy, causing erroneous gas level readings

To replace the sensor:

a. Confirm that system power has been removed
b. Remove the gas sensor module enclosure cover,
c. Unscrew the two thumb screws in the top of the faceplate, lift the transmitter assembly and rotate 90

relieve the wiring service loop.
d. Unplug the sensor connector from the transmitter
e. Unscrew the old sensor assembly from the enclosure conduit hub. Remove the sensor assembly with its

harness
f. Unscrew sensor housing cover from the sensor (be sure to loosen the set screw first)
g. Carefully pull the old sensor straight up from the socket
h. Press the new sensor into the socket.
i. Reverse the preceding steps to install the sensor assembly.
j. Allow the new sensor to stabilize for a minimum of 3 hours and then calibrate using the procedure in

Section 6.

6.5 INSTALLATION INSPECTION

o

to relieve the

o

to

Prior to system start-up or trouble shooting the entire system should be visually inspected. The following are
guidelines for that inspection:

6.5.1.1 CONTROLLER INSTALLATION

• Controller installed in conformance to instruction manual recommendations.

• AC power is correctly grounded.

• Hot AC and relay connections have safety covers installed.

Page: 27

Model 5100-XX-IT Toxic Gas Sensor Module

6.5.1.2 SENSOR MODULE INSTALLATION

• Module installation in conformance with this manual.

• Modules accessible for calibration.

• Wiring terminations clean and correct.

6.5.1.3 MOISTURE TRAPS AND RAINSHIELDS

• Conduit seals and drains installed to avoid moisture build up in electronics enclosure. Water
accumulation in sensor module enclosures is a major cause of damage and system failures - take
precautions to seal electrical conduits and provide moisture traps and drains to avoid water damage

• Rain-shields installed where applicable.

6.5.1.4 STANDARD VOLTAGES

• DC Voltage to be applied to the sensor module must be between 10 VDC and 30 VDC.

6.5.2 INSPECTION AND TROUBLESHOOTING GUIDE

The inspection and troubleshooting guide can be used to step through the system start-up and to determine
the corrective action if a fault occurs.

6.5.3 IF MODULE DOES NOT RESPOND TO GAS

1. Repeat calibration procedure.

2. Remove the gas and wait for the timer to completely count down.

3. Apply 50 PPM and verify that the sensor sees 50 PPM gas after calibration.

4. If the sensor still does not see gas, power cycle the unit and repeat calibration.

6.5.4 IF THE MODULE DISPLAYS “STARTING” FOR MORE THAN 1 HOUR

1. Make sure the sensor is placed in an ambient room temperature environment.

2. Power cycle the sensor.

3. Ensure that the sensor is not exposed to the gas of interest during warm-up.

6.5.4.1 IF THE MODULE DOES NOT DISPLAY THE CORRECT PPM

1. Power cycle the unit

2. Recalibrate the sensor.

6.5.4.2 IF THE DISPLAY SHOWS ‘F’

1. Power down the unit

2. Open the enclosure and unplug the sensor assembly from the transmitter board.

3. Plug the sensor back into the transmitter board carefully and ensure a secure fit.

4. Power up the unit.

6.5.4.3 IF THE DISPLAY SHOWS ‘C’

1. Complete calibration and exit to operating mode.

6.5.4.4 IF THE DISPLAY SHOWS ‘S’

1. Check connections with Sentry Connections.

Page: 28

Model 5100-XX-IT Toxic Gas Sensor Module

7. APPENDICES

APPENDIX A - SPECIFICATIONS

Sensor type: Electrochemical

Max. Range 0-25 %Vol 0-1000 PPM 0-100 PPM 0-10 PPM
User Settings Range 0-100, 0-500, variable 0-10, variable 0-5, variable
Zero Drift +/- 0.1% +/- 1 PPM +/- 0.5 PPM +/- 0.5 PPM
Repeatability +/- 0.2% +/- 1 PPM +/- 1 PPM +/- 0.5 PPM
Linearity +/- 0.2% +/- 1 PPM +/- 1 PPM +/- 0.5 PPM
Resolution +/- 0.1% 0.5 PPM 0.1 PPM 0.1 PPM
Response Time (1) <10 sec <25 sec. <30 sec. <60 sec
Accuracy +/- 0.2% +/- 1 PPM +/- 0.5 PPM +/- 0.5 PPM
Sensor Life 2 years 2 years 2 years 2 years

(1) Response time to 90% full signal value for applied concentration
(2) Sensor life typical for use at standard temperature and pressure with occasional exposure to gas of interest

Output:

Display: Fixed and Scrolling LED
Relays (Optional): 8 Amp, High Alarm, Low Alarm, 2 Amp Trouble all SPDT
Analog Output (Optional) Analog 4-20 mA (Trouble 0 mA, Calibration 1.5 mA)
Signal Output: Sentry bus
Serial RS-485 Modbus RTU

Input:

Remote Alarm Reset: Normally open digital input (supervised or non-supervised)

Electrical Data:

Power consumption: 2 watts
Connection type: 3 wire
Input voltage: 24 VDC nominal: 10-30VDC

5100-03-IT O2 5100-04-IT CO 5100-05-IT H2S 5100-06-IT Cl2

Operating Range:

Ambient Temp (oF) 5 to 122 oF -4 to 122 oF -40 to 122 oF -4 to 122 oF
Ambient Temp (oC) -15 to 50 oC -20 to 50 oC -40 to 50 oC -20 to 50 oC
Relative Humidity 5 – 99% 5 – 99% 5 – 99% 5 – 99%

Enclosure:

Material - Standard: Polyester powder-coated, sand-cast, copper-free aluminum
Material - Stainless Steel Option 316 Stainless Steel (FM approval pending)
Dimensions: 7.5 x 5.0 x 4.8 inches Al, 7.5 x 5.0 x 4.4 inches SS
(H x W x D) (21.6 x 12.7 x 12.2 cm)
Weight: 2.7 lb. (1.3 Kg) (standard Aluminum enclosure)

5.4 lb. (2.6 Kg) 316 Stainless Steel
Housing: NEMA 4X

Electrical Classification

Performance: Explosion proof, Class 1, Div. I, Groups B, C, D
Class I, Zone 1, groups IIB+H2 IP66

Approvals: FM Approved Performance and Safety Approval Pending

5100-03-IT O2 5100-04-IT CO 5100-05-IT H2S 5100-06-IT Cl2

Page: 29

Model 5100-XX-IT Toxic Gas Sensor Module

Modbus:

Baud: 38400 (Adjustable 2400 to 38400 Baud)

Parity: None

Stop bit: 1
Data bits: 8

Flow Control: None
Memory map: Appendix E

Warranty: Limited Warranty 2 years

Specifications subject to change without notice

Ordering Information:

5100 - XX - IT - YY - ZZ

|- 5100 Series | | | |
|- 03 = O
|- 04 = CO |- IT Series | |
|- 05 = H
|- 06 = Cl

| | |

2

S |- Al (Aluminum Enclosure) |- 01= Sentry, RS-485, 4-20mA, & Digital Input

2

|- SS (Stainless Steel) |- 02= Sentry, RS-485, 4-20mA, Digital Input & Relays

2

Page: 30

APPENDIX B: - MODEL NUMBERS & PARTS LIST

Sensor Module

5100-03-IT Gas Sensor Module, Oxygen
5100-03-IT-SS Gas Sensor Module, Oxygen, Stainless Steel Enclosure
5100-04-IT Gas Sensor Module, Carbon Monoxide
5100-04-IT-SS Gas Sensor Module, Carbon Monoxide, Stainless Steel Enclosure
5100-05-IT Gas Sensor Module, Hydrogen Sulfide
5100-05-IT-SS Gas Sensor Module, Hydrogen Sulfide, Stainless Steel Enclosure
5100-06-IT Gas Sensor Module, Chlorine
5100-06-IT-SS Gas Sensor Module, Chlorine, Stainless Steel Enclosure

Model 5100-XX-IT Toxic Gas Sensor Module

Options

5394-52 Remote Sensor/Display Option
5311-00 Rainshield

Calibration Items

1250-01 Gas Sensor Calibration Kit, Type A (O
1250-03 Gas Sensor Calibration Kit, Type C (Cl

2, CO, H2

)

2

1260-00 Gas Cylinder, Air, (Type A) , 105 litres
1260-04 Gas Cylinder, CO 100 PPM, (Type A) 57 litres
1260-05 Gas Cylinder, H
1260-06 Gas Cylinder, Cl

S in N2, 25 PPM, (Type A) 57 litres

2

, 5 PPM, (Type C) 104 litres

2

1260-13 Gas Cylinder, CO, 1000 PPM, (Type A), 105 liters
5360-00 Calibrator Head Standard
1256-01 Regulator Type A Calibrator

1265-03 Regulator Type C Calibrator
5358-01 Calibration Adapter - Direct, Standard
5358-50 Calibration/Configuration Magnetic Tool

Spare Parts

5200-03-IT Sensor, for 5100-03-IT

5200-04-IT Sensor, for 5100-04-IT

5200-05-IT Sensor, for 5100-05-IT

5200-06-IT Sensor, for 5100-06-IT

SPL21834 Sensor Assembly, Aluminum, for 5100-03-IT

SPL21832 Sensor Assembly, Aluminum, for 5100-04-IT

SPL21830 Sensor Assembly, Aluminum, for 5100-05-IT

SPL21833 Sensor Assembly, Aluminum, for 5100-06-IT

SPM27082 Sensor Assembly, 316SS, for 5100-03-IT
SPM27083 Sensor Assembly, 316SS, for 5100-04-IT

SPM27079 Sensor Assembly, 316SS, for 5100-05-IT

SPM27084 Sensor Assembly, 316SS, for 5100-06-IT

SPL21824 Transmitter

SPL21810 Enclosure, Transmitter, Aluminum

SPL21825 Enclosure Transmitter, 316SS

SPL21825 Interface Board with Relay

SPL27826 Interface Board without Relay

S)

Page: 31

Model 5100-XX-IT Toxic Gas Sensor Module

APPENDIX C: LIMITED WARRANTY

SIERRA MONITOR CORPORATION warrants its products to be free from defects in workmanship or material
under normal use and service for two years after date of shipment. SMC will repair or replace without charge
any equipment found to be defective during the warranty period. Final determination of the nature and
responsibility for defective or damaged equipment will be made by SMC personnel.

All warranties hereunder are contingent upon proper use in the application for which the product was intended
and do not cover products which have been modified or repaired without SMC approval or which have been
subjected to accident, improper maintenance, installation or application, or on which original identification
marks have been removed or altered. This Limited Warranty also will not apply to interconnecting cables or
wires, consumables (ie. calibration gases, batteries, sensors), nor to any damage resulting from battery
leakage.

In all cases SMC’s responsibility and liability under this warranty shall be limited to the cost of the equipment.
The purchaser must obtain shipping instructions for the prepaid return of any item under this warranty
provision and compliance with such instruction shall be a condition of this warranty.

Except for the express warranty stated above, SMC disclaims all warranties with regard to the products sold
hereunder including all implied warranties of merchantability and fitness and the express warranties stated
herein are in lieu of all obligations or liabilities on the part of SMC for damages including, but not limited to,
consequential damages arising out of/or in connection with the use or performance of the product.

Page: 32

Model 5100-XX-IT Toxic Gas Sensor Module

APPENDIX D: REMOTE SENSOR/DISPLAY DRAWING 5394-52

Page: 33

Model 5100-XX-IT Toxic Gas Sensor Module

APPENDIX E: MODBUS MEMORY MAP

Read Register Table

Register Description Comments

40001 Concentration Gas Concentration multiplied by 100
40002 Temperature Temperature in degrees Celsius scalled by a factor of 100
40003 High Alarm Relay Boolean indicating the High Alarm Status, 0 No Alarm, 1 High Alarm
40004 Low Alarm Relay Boolean indicating the Low Alarm Status, 0 No Alarm, 1 Low Alarm
40005 Low Alarm Value Low alarm set point, used for activating Alarms
40006 High Alarm Value High alarm set point, used for activating High Alarms
40007 Reserved
40008 Reserved
40009 Reserved
40010 Reserved
40011 Trouble Bits 0 for no trouble
40012 Trouble 1 for any trouble, 0 for no trouble
40013 High Alarm Immediate Like 40003. but never latched
40014 Low Alarm Immediate Like 40004, but never latched
40015 Random ID Randomly generated permanent ID of sensor
40016 Restart Count
40017 Run time – high In minutes
40018 Run time – low In minutes
40019 Max. gas value *scale ((see 40024)
40020 Model 51005, 51003, 51004, 51006, etc
40021 Range *scale (see 40024)
40022 Units 3 is PPM
40023 Temperature Units 0 is C, 1 is F
40024 Gas Scale Value like 1 or 100
40025 Temperature Scale Value like 1 or 100

Page: 34