RKI Instruments 65-2670RK-CL210 User manual

T2A

Operator’s Manual

Part Number: 71-0529

Revision: P9

Released: 3/25/21

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WARNING

Read and understand this instruction manual before operating detec­tor. Improper use of the detector could result in bodily harm or death.

Periodic calibration and maintenance of the detector is essential for
proper operation and correct readings. Please calibrate and maintain
this detector regularly! Frequency of calibration depends upon the
type of use you have and the sensor types. Typical calibration frequen ­cies for most applications are between 1 and 3 months, but can be
required more often or less often based on your usage.

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Product Warranty

RKI Instruments, Inc. warrants gas alarm equipment sold by us to be free from defects in
materials, workmanship, and performance for a period of one year from date of shipment from
RKI Instruments, Inc. Any parts found defective within that period will be repaired or
replaced, at our option, free of charge. This warranty does not apply to those items which by
their nature are subject to deterioration or consumption in normal service, and which must be
cleaned, repaired, or replaced on a routine basis. Examples of such items are:

Warranty is voided by abuse including mechanical damage, alteration, rough handling, or
repair procedures not in accordance with the operator’s manual. This warranty indicates the
full extent of our liability, and we are not responsible for removal or replacement costs, local
repair costs, transportation costs, or contingent expenses incurred without our prior approval.

a) Absorbent cartridges d) Batteries
b) Pump diaphragms and valves e) Filter elements
c) Fuses

THIS W ARRAN T Y IS EXPRESSLY IN LIEU OF ANY AND ALL OTHER W ARRAN TIES
AND REPRESENTATIONS, EXPRESSED OR IMPLIED, AND ALL OTHER
OBLIGATIONS OR LIABILITIES ON THE PART OF RKI INSTRUMENTS, INC.
INCLUDING BUT NOT LIMITED TO, THE WARRANTY OF MERCHANTABILITY OR
FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT SHALL RKI INSTRUMENT S,
INC. BE LIABLE FOR INDIRECT, INCIDENTAL, OR CONSEQUENTIAL LOSS OR
DAMAGE OF ANY KIND CONNECTED WITH THE USE OF ITS PRODUCTS OR
FAILURE OF ITS PRODUCTS TO FUNCTION OR OPERATE PROPERLY.

This warranty covers instruments and parts sold to users by authorized distributors, dealers,
and representatives as appointed by RKI Instruments, Inc.

We do not assume indemnification for any accident or damage caused by the operation of this
gas monitor, and our warranty is limited to the replacement of parts or our complete goods.

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Warning Statements

The RKI Instruments, Inc. T2A Toxic Gas Monitor is Class I Division 1 Certified. The
assembly is able to maintain its c ertification at all times whil e in the field, simply by us ing the
non-intrusive calibration method which requires the use of an RKI-distributed magnet.
However, if the Moore lid is removed, for whatever reason, the T2A’s certification is no longer
valid.

To avoid invalidating the certification, complete all wiring configurations BEFORE putting
the T2A in the field. Once in the field, always use the RKI-distributed magnet to ensure non­intrusive calibration.

Strong magnetic fields may interfere with the non-intrusive magnetic switches. A strong
magnetic field may momentarily active a switch, or permanently disable the switch to t he “on”
or “off” position.

Do not cover the hole in the calibration cup, as this will cause the calibration to be inaccurate.

Danger Statem en t s

DANGER: The RKI Instruments Inc. T2A is an ambient air Hazardous gas sensor assembly
and only monitors in the immediate vicinity of the sensor housing. A site survey is required in
order to determine the best placement and quantity of sensor assemblies. Improper installation
can lead to an undetectable gas leak which could result in personal injury or loss of life.

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Table of Contents

Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

Specifications. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

External Description. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

Internal Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

Exploded Drawing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

Remote-Mounted Kit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

Installation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

Mounting the T2A . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

Remote-Mounted Kit Wiring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

Wiring Power and 4-20 mA Output. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

Closing the Enclosure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

Start Up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

Operation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

Normal Operating Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

Magnetic Buttons. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

Powering the Device . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

Faults . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

Accessing Menus . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

Product Settings and Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

Entering the Product Settings and Configuration Menu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

Alarm Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

System Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

Zero/Calibration Timer Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26

Calibration Method . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26

4-20 mA Offset Settings. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27

Display Screen Contrast Setting. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28

Return to Factory Default Settings. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29

Reset Zero & Calibration Values . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30

Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31

Troubleshooting. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32

Desiccant Replacement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32

Sensor Replacement. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33

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Calibration. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35

Calibration Frequency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35

Materials. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35

Zeroing the Sensor. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36

Calibrating the Sensor (Manual Cal) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37

Calibrating the Sensor (Auto Cal) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39

Parts List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42

Appendix A: 4-20 mA Signal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44

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Overview

The RKI Instruments, Inc. T2A Explosion-Proof Ambient Air Hazardous Gas Detector is
designed to detect a wide range of toxic gases in potentially hazardous environments. This
product’s enclosure is QPS certified as Class I, Division 1, Groups B, C, and D and rated for
Class I, Zone 1, Group IIB. The T2A features non-intrusive magnetic switches that allow for
complete system configuration, regular calibration, and product maintenance to be performed
in the field, without opening the enclosure and breaking the seal of the enclosure, thereby
compromising the explosion-proof rating of the device. Non-intrusive interface with the T2A
is made possible by use of the magnetic tool included in the purchase of the device. The T2A
display screen will always show the present concentration of gas being detected by the sensor
assembly.

This document is an operation manual containing diagrams and step-by-step instructions for
the proper and safe installation, start-up, configuration and settings, normal operation, and
product maintenance of the T2A.

In this manual, the instructions reference the use of push-buttons, located on the front panel of
the device. In certain environments, the activation of the non-intrusive magnetic switches,
through the use of the magnetic tool, will replace the directive of the button-press actions. To
apply the magnetic tool, hold the tool to the side of the device enclosure adjacent to the push­button that you wish to activate. When the magnetic switch is toggled, an on-screen indicator
will appear on the display screen, signifying that a connection was made.

NOTE:This document should be read in its entirety before the initial operation of the

product.

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Specifications

Table 1 lists specifications for the T2A.

Ammonia 0-100 ppm 1 ppm Cl. 1 Div. 2

Carbon Monoxide 0-300 ppm Cl. 1 Div. 1
Chlorine 0-3.0 ppm 0.1 ppm Cl. 1 Div. 2

Chlorine Dioxide 0-1.00 ppm 0.01 ppm

Hydrogen Chloride 0-15 ppm 1 ppm

Table 1: S pecification s

Target Gas Detection Range Increments Haz. Loc.

0-200 ppm
0-400 ppm

0-10.0 ppm
0-20.0 ppm

0-5.0 ppm 0.1 ppm

Hydrogen Cyanide 0-30 ppm Cl. 1 Div. 1
Hydrogen Fluoride 0-10.0 ppm 0.1 ppm Cl. 1 Div. 2
Hydrogen Sulfide 0-100 ppm 1 ppm Cl. 1 Div. 1
Nitric Oxide 0-250 ppm Cl. 1 Div. 2
Nitrogen Dioxide 0-20.0 ppm 0.1 ppm
Oxygen 0-25.0% 0.1% volume
Ozone 0-100 ppm 1 ppm
Phosphine 0-5.0 ppm 0.1 ppm Cl. 1 Div. 1
Sulfur Dioxide 0-20 ppm 1 ppm

Sampling Method Diffusion
Enclosure Ratings Explosion/Flame-Proof
Junction Box Hazardous

Location Certification

Class I, Division 1, Groups B, C, D
Ex db IIB Gb
Class I, Zone 1, AEx db IIB Gb

Sensor Housing
Hazardous Location
Certification

Class I, Division 1 (or Division 2),
Groups B, C, D

Ex db IIB Gb

NOTE: Certification only app lies to some
gases. Toxic gases not certifi ed for Div. 1
locations are suitable for Div. 2
applications but have no third party
approval.

Operating Voltage 12 - 35 VDC

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Table 1: S pecification s

Maximum Current Draw 35 mA
Operating Temperature

-40°C to +60°C (-40°F to +140°F)

Range
Humidity Range 0 - 98% relative humidity, non-condensing
Signal Output 4 to 20 mA (2-wire)
Enclosur e Ma t e rial Aluminum
Sensor Housing Material 303 Stainless steel
Max Cable Length for

250 feet

Remote-Mounted Kit
Dimensions 5.5” D x 6” W x 7” H
Weight 6 lbs.

WARNING: When using the T2A, you must follow the instructions and warnings in this

manual to assure proper and safe operation of the T2A and to minimize the
risk of personal injury. Be sure to maintain and periodically calibrate the T2A
as described in this manual.

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External Description

Figure 1: T2A External Component Location

1 MENU button 7 Sensor housing assembly
2 Front panel thumbscrew 8 Rain guard
3 Enclosure 9 Magnetic tool
4 Explosion proof plug 10 ADD button
5 SUB button 11 Enclosure lid locking screw
6 Mounting hole 12 Display screen

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Internal Description

Figure 2: Internal Component Location

1 Faceplate assembly 4 Facep late mounting screws
2 Power input/4-20 mA

output terminal block

3 Sensor housing socket 6 Microcontroller module

5 Microcontroller module

mounting screws

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Exploded Drawing

Figure 3: Exploded Drawing

1 Enslosure lid 6 Sensor element
2 Internal system 7 Sensor housing cap

(with flame arrestor for Class 1 Div. 1 assemblies;
without flame arrestor for Class 1 Div. 2 assemblies)

3 Sensor housing plug 8 Rain guard
4 Sensor housing base 9 Enclosure ground screw
5 Analog sensor board 10 Dust plug

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Remote-Mounted Kit

A remote-mounted sensor kit can be ordered if the sensor needs to be somewhere that is not
conveniently accessible for viewing the display screen.

The kit includes a second junction box on a cable with a cable bushing/cable gland. The cable
can be ordered in 1-foot increments with a maximum of 250 feet.

The cable and cable bushing/cable gland are not
in a classified location, the cable bushing must be removed and replaced with explosion-proof
conduit. You must meet local electrical codes and use appropriate construction technique to
maintain the explosion-proof classification of the assembly.

Installation

This section describes procedures to mount the T2A in the monitoring environment and wire
the T2A.

Mounting the T2A

1. Consider the following when you select the mounting site.

explosion-proof. If the assembly is installed

• Select a site where the T2A is not likely to be bumped or disturbed. Make sure there is
sufficient room to perform start-up, maintenance, and calibration procedures.

• Select a site that is representative of the monitoring environment and where the target
gas is likely to accumulate or where it is most likely to leak. The T2A should not be
installed near an entrance, air intake, or exhaust point.

• The sensor must point down.

• A voi d installing the T2A in a loc ation wh ere a irbor ne par ticle s could c over or coat t h e
sensor.

NOTE:These guidelines are ONLY intended as a general directive for the placement of the

T2A. This information should NOT serve as a complete list when considering all
potential parameters for the proper location of the unit. It is STRONGLY advised
that a third party Certified Industrial Hygienist, or other Certified Safety Professional,
conduct a site survey and annotate the location and quantity of detection devices that
should be installed for EVERY installation of EVERY site.

2. Select a mounting location and installation hardware. Mounting to a concrete or steel
structure is recommended to minimize vibration and moisture. Use a maximum 1/4”-20
bolt or 1/4” diameter screw, flat washers, Grade 5 material, and corrosion protection like
paint, galvanization, or zinc plating.

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0.25

5.50

6.00

Ø 2. 00

9.16

4.49

7.16

Figure 4: T2A Dimensions

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4.64

2.70

9.95

3. For a remote-mounted kit, install the detector junction box at the monitoring environment
using techniques appropriate for the mounting area’s classification and for the local
electrical code. The cable and cable bushing/cable gland sent with the assembly are not
explosion-proof.

WARNING: If installed in a classified area, use appropriate construction technique to

maintain the explosion proof classification of the assembly.

Figure 5: Remote-Mounted Kit’s Detector Junction Box Dimensions

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Remote-Mounted Kit Wiring

The remote-mounted kit generally comes prewired but if it becomes disconnected, follow
these steps to reconnect it.

CAUTION: The internal components can be static sensitive. Use caution when opening the

enclosure and handling internal components.

CAUTION: Make sure the power source is off before beginning the wiring procedure.

CAUTION: DO NOT use any metal objects or tools to remove the terminal board from the

internal system.

1. Unscrew each enclosure lid and set it aside.

2. At the amplifier junction box, grab the thumbscrews and gently lift the internal system out
of the enclosure. It can rest on the edge of the enclosure.

3. One end of the cable has a connector and the other has ferruled wires.

4. Feed the connector end of the cable through a conduit hub at the amplifier junction box.

WARNING: If installed in a classified area, use appropriate construction technique to

maintain the explosion proof classification of the assembly.

5. Plug the connector into the sensor connector socket at the amplifier junction box.

6. Feed the ferruled-wire end of the cable through a conduit hub at the detector junction box.

WARNING: If installed in a classified area, use appropriate construction technique to

maintain the explosion proof classification of the assembly.

7. Connect the ferruled wires to the color-coded terminals in the detector junction box.

8. Secure the detector junction box’s enclosure lid back onto the enclosure.

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Wiring Power and 4-20 mA Output

The T2A requires +12 to +35 Volts of wired DC power to operate. It sends a 4-20 mA signal
out through the power wires.

CAUTION: The internal components can be static sensitive. Use caution when opening the

enclosure and handling internal components.

CAUTION: Make sure the power source is off before beginning the wiring procedure.

CAUTION: DO NOT use any metal objects or tools to remove the terminal board from the

internal system.

1. Unscrew the enclosure lid and set it aside.

2. Grab the thumbscrews and gently lift the internal system out of the enclosure. It can rest
on the edge of the enclosure.

NOTE:Disconnecting the sensor connector plug from the sensor housing will allow for the

complete removal of the internal system from the device enclosure. Disconnecting the
internal system may provide ease in accessing the control board terminals for wiring.
Reconnect the sensor connector plug before reinstalling the internal system.

3. Feed the power and 4-20 mA signal wires through the T2A’s power hub and into the
enclosure. The minimum recommended wire gauge is 26 AWG and the maximum
recommended wire gauge is 14 AWG.

WARNING: Use appropriate construction technique to maintain the explosion proof

classification of the T2A.

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4. Connect the power and 4-20 mA signal wires to the Input Terminal Block as shown below.

CAUTION: If shielded cable is used, leave the cable shield’s drain wire disconnected and

insulated at the T2A. You will connect the opposite end of the cable’s drain wire
to the controller’s chassis (earth) ground.

Figure 6: Wiring Power and Signal Wiring

5. If shielded cable is used, connect the cable’s drain wire to an available chassis (earth)
ground at the controller. RKI controllers typically have a ground stud that can be used to
ground the cable’s drain wire.

Closing the Enclosure

1. Place the internal system back into the enclosure, matching each mounting post to its
corresponding eyelet anchored within the base of the enclosure.

2. Using the thumbscrews, gently push to seat the internal system into the mounting posts.

NOTE:The thumbscrews on the T2A function ONLY as thumb-holds for ease in removal of

the internal system from the base of the enclosure. Do NOT attempt to loosen or
tighten the thumbscrews when opening or closing the enclosure.

3. Verify that the sealing ring, seated at the threaded opening of the device enclosure, is
correctly in place.

4. Secure the enclosure lid back onto the enclosure.

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Start Up

WARNING: When securing the lid onto the device, tighten the enclosure lid by hand

ONLY. Overtightening of the lid by use of hand-tools could result in damage to
the O-ring, potentially compromising the moisture seal , resulti ng in an un safe
environment.

This section describes procedures to start up the T2A and place the T2A into normal
operation.

1. Complete the installation procedures described earlier in this manual.

2. Verify that the power wiring is correct and secure.

3. Turn on the power source.

4. Verify that the controller is on and operating properly. Refer to the controller operator’s
manual.

5. The T2A automatically powers on and enters a 1 minute startup period.

6. At the end of the startup, the T2A is in Normal Operating Mode.

1. Measured gas concentration (reading)

2. Gas concentration unit of measure

3. Sensor element gas type

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7. Allow the detector to warmup for the appropriate amount of time as shown below,
depending on the sensor type.

Detection Gas

Warmup Time

After an Extended

Time Off Power

Warmup Time

After a Short

Time Off Power

Ammonia 12 hours 4 hours
Carbon Monoxide 2 hours 10 minutes
Chlorine
Chlorine Dioxide
Hydrogen Chloride 12 hours
Hydrogen Cyanide
Hydrogen Fluoride 2 hours
Hydrogen Sulfide
Nitric Oxide 12 hours 12 hours
Nitrogen Dioxide 2 hours 10 minutes
Oxygen
Ozone
Phosphine
Sulfur Dioxide

8. The T2A is factory-calibrated before shipping from RKI. If a full calibration is desired at
startup, see page 35.

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Operation

Reading above full scale
(4-20 mA output is 25 mA)

1. Measured gas concentration (reading)

2. Gas concentration unit of measure

3. Sensor element gas type

WARNING: Do not remove the sensor housing cap or enclosure lid while the circuits are

Normal Operating Mode

While in Normal Operating Mode, the T2A continuously samples the air and updates the
measured concentration of the target gas on the display screen. The display, when in Normal
Operating Mode, appears as shown below.

energized unless the area is determined to be non-hazardous. Keep the sensor
housing cap and enclosure lid tightly closed during operation.

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Touch magnet here to
activate MENU button

Touch magnet here to

activate ADD button

Touch magnet here to
activate SUB button

Magnetic Buttons

Use the provided magnet to actuate the T2A’s buttons without having to remove the junction
box’s lid. Touch the magnet to the outer edge of the junction box lid near the button you want
to actuate. Tapping the junction box is the same and pressing and releasing the button.
Holding the magnet against the junction box is the same as pressing and holding the button.

Powering the Device

When power is first applied to the T2A, the unit automatically powers on and begins the
startup sequence. The directions below describe how to power off and power on the T2A once
power has been applied.

Powering Off

Powering off the device stops the operation of the unit. The Product Settings and
Configuration, as well as the operation settings, including the zero and calibration of the
sensor, will be unaffected.

1. Press and hold the SUB button for approximately 6 seconds, until “OFF” shows on the
display screen.

2. The display screen will continue to show “OFF” for the duration of time that the unit is
powered off, as long as uninterrupted power is supplied to the unit.

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Powering On

Powering on the device begins the operation of the unit, automatically initiating the system
start-up cycle and 1-minute warmup period. The T2A will be in normal operating mode at the
completion of the system start-up.

1. Press the ADD button once to turn the unit on.

Faults

In the event of a device failure, the unit will alternate between the normal opera ting screen and
a fault screen on the display, in 5 second intervals, until the fault has been cleared, or is
corrected. The fault code, located in the bottom-left corner of the display, appears on both
screens. The unit continuously registers that the system is in fault. When the fault is corrected,
the unit will return to normal operating mode.

For a list of the fault codes and warning symbols of the T2A, and their associated meaning,
see page 32.

Accessing Menus

The Product Settings and Configuration menu is accessible from Normal Operating Mode. To
access the Product Settings and Configuration menu, press and hold the MENU button, for
approximately 6 seconds, until the menu is activated and open on the display screen.

NOTE:After 5 minutes of no interaction with the device, the unit will automatically return t o

normal operating mode.

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Product Settings and Configuration

The Product Settings and Configuration menu allows the end-user to tailor the device setting s
to meet their required specifications and/or site conditions.

The T2A continues monitoring for gas while in the Product Settings and Configuration menu.
The Product Settings and Configuration menu consist of the following screens:

• Alarm Test (see page 24)

• System Information (see page 25)

• Zero/Calibration Timers (see page 26)

• Calibration Method (see page 26)

• 4-20 mA Offset Settings: Zero Offset Setting, Full-Scale Offset Setting (see page 27)

• Display Screen Contrast Setting (see page 28)

• Return to Factory Default Settings (see page 29)

• Reset Zero and Calibration Values Only (see page 30)

Entering the Product Settings and Configuration Menu

While the device is in normal operating mode, press and hold the MENU button, for
approximately 6 seconds, until the Product Settings and Configuration menu is activated and
open on the display screen.

NOTE:After 5 minutes of no interaction with the device, the unit will automatically return t o

normal operating mode.

Alarm Test

The alarm test simulates a gas level reading. The alarm test is used to ensure the proper
functionality of the relay settings on the controller. The test can also be used to simulate
emergency/safety drills onsite.

NOTE:Triggering T2A relays will also simulate alarm conditions at the controller.

Controllers cannot distinguish between real and simulated data received. When the
controller relays are triggered, alarm devices will perform as intended, initiating
emergency procedures as if a harmful or toxic gas was actually present. To prevent
this from occurring, set the controller to calibration mode before performing the
alarm test. Calibration mode allows data transmission without relay activation.

It is recommended that an alarm test be conducted EVERY 30 days, alongside the
maintenance and calibration of the detector.

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Performing the Alarm Test

The alarm test gas level reading can be increased or decreased in increments of 5% of the
sensor scale, up to 100% of the sensor scale.

1. Enter the Product Settings and Configuration menu by pressing and holding the MENU
button for 6 seconds. The alarm test screen appears.

2. Press the ADD button until the low and high alarm levels are reached and the relay(s) are
triggered to light all visual alarm(s) and sound all audio alarm(s) on the controller.

3. Once all relays have been tested and the test is complete, press the SUB button to return
the alarm test reading back to zero and to deactivate the controller alarm(s).

4. Use the MENU button to scroll through the rest of the Product Settings and C onfiguration
menu and return to Normal Operating Mode.

System Information

The system information screen allows the end-user to view the following information:

• The scale of the sensor element.

• The voltage value (in volts) that the sensor was reading when zeroed.

• The current voltage value (in volts) that the sensor element is reading.

• The sensor assembly’s serial number.

• The sensor assembly’s date of manufacture.

This screen is for informational purposes only.

1. If necessary, enter the Product Settings and Configuration menu by pressing and holding
the MENU button for 6 seconds.

2. Press and release the MENU button until the System Information screen appears.

3. Review the information displayed.

4. Use the MENU button to scroll through the rest of the Product Settings and C onfiguration
menu and return to Normal Operating Mode.

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Zero/Calibration Timer Information

The zero/calibration time information screen allows the end-user to view the following
information:

• The days since the sensor assembly was last zeroed.

• The days since the sensor assembly was last calibrated.

• The calibration number of the sensor, used for diagnostic purposes.

This screen is for informational purposes only.

NOTE:The Cal field automatically updates after an Auto Cal. When performing a Manual

Cal, the gas reading must be adjusted by at least one button press to get the Cal field
to update.

1. If necessary, enter the Product Settings and Configuration menu by pressing and holding
the MENU button for 6 seconds.

2. Press and release the MENU button until the Zero/Calibration Timer Information screen
appears.

3. Review the information displayed.

4. Use the MENU button to scroll through the rest of the Product Settings and C onfiguration
menu and return to Normal Operating Mode.

Calibration Method

NOTE:HCl - It is recommended that HCl versions only be calibrated using Auto Cal but they

can be calibrated using Manual Cal, if desired.

O

- If calibrating with 100% N2, you must use Manual Cal. To calibrate using Auto

2

Cal, a gas concentration between 10 and 18% O2 is recommended.

The calibration method selection allows you to choose how you calibrate the sensor element.
Manual Calibration

(factory setting): Use the ADD and SUB buttons during calibration to

match the reading shown on the screen to the value of the gas being applied.
Auto Calibration

: Sets the reading, after a predetermined amount of time, during calibration to

the value entered during the auto calibration setup process.

1. If necessary, enter the Product Settings and Configuration menu by pressing and holding
the MENU button for 6 seconds.

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2. Press and release the MENU button until the Cal Method screen appears.

3. Use the ADD button to select manual calibration and the SUB button to select auto
calibration.

4. Use the MENU button to scroll through the rest of the Product Settings and C onfiguration
menu and return to Normal Operating Mode.

4-20 mA Offset Settings

Setting the 4-20 mA offset allows the end-user to calibrate the sensor’s analog output. Upon
installation of the device, if the detected gas reading on T2A does not correspond to the
reading on the controller, the zero offset (4 mA) and the full-scale offset (20 mA) can be
adjusted on the unit.

Over time, as electronic components suffer from normal wear and tear , the circuits will t end to
drift. This drift can cause variances in the amount of current output by the sensor, or in the
current measurement by the controller. If at any time the reading on the T2A no longer
matches the reading on the controller, the 4-20 mA offset will need to be recalibrated.

The factory default settings on the T2A for the 4-20 mA offset are 4.00 mA for the zero offset
and 20.00 mA for the full-scale offset.

1. If necessary, enter the Product Settings and Configuration menu by pressing and holding
the MENU button for 6 seconds.

2. Press and release the MENU button until the 4-20 mA Offset screen appears.

3. Press and release the ADD button to set the 4-20 mA offset and advance to the zero offset
setting screen. If you do not wish to set the 4-20 mA offset, press and release the SUB or
MENU button to advance to the display screen contrast setting screen.

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Zero Offset Setting

If “Yes” is selected to set the 4-20 mA offset:

1. Use the ADD and SUB buttons to increase and decrease the zero offset on the unit,
respectively, unti l t he controller reads 0 %/ppm, depending on the gas t ype being detected.

2. Press the MENU button to save the desired setting and to advance to the full-scale offset
setting screen.

Full-Scale Offset Setting

NOTE:Adjusting the full-scale offset will initiate alarm conditions. Disable the alarms or

make sure all personnel are aware that any alarms are false.

1. Use the ADD and SUB buttons to increase and decrease the full-scale offset, respectively ,
until the controller reads the full scale value for that channel.

2. Press the MENU button to save the desired setting and to advance to the display screen
contrast setting screen.

Display Screen Contr ast Setting

The display screen contrast is the difference in luminance or color that makes the displayed
images distinguishable. Due to varying external elements, such as extreme sunlight, the
brightness of the display screen may need to be adjusted for optimum viewing.

The factory default setting on the T2A for the display screen contrast is 29, approximately
45% of the contrast scale. The contrast setting ranges from 1 to 64.

NOTE:Setting the contrast too low will cause the display image to become faint or

indistinguishable, especially when the unit is located in areas with full-sun. The
resulting field of view could be misinterpreted as an error within the device. Be sure
to verify that the selected contract is within an appropriate range of viewing.

1. If necessary, enter the Product Settings and Configuration menu by pressing and holding
the MENU button for 6 seconds.

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2. Press and release the MENU button until the Contrast screen appears.

3. Use the ADD and SUB buttons to brighten and dim the contrast, respectively.

4. Use the MENU button to scroll through the rest of the Product Settings and C onfiguration
menu and return to Normal Operating Mode.

Return to Factory Default Settings

Returning the T2A to its factory default settings will reset all customization of the device,
including the zero and calibration settings of the sensor element. A factory default does not
change the gas type.

T2A Product and Configuration Factory Default Settings

Configuration Setting

Alarm T est -­System Information -­Zero/Calibration T ime r *Cleared*
Calibration Method Manual
4-20 mA Zero Offset Setting 4.00 mA
4-20 mA Full-Scale Offset Setting 20.00 mA
Contrast --

T2A Operation Factory Default Settings

Configuration Setting

Sensor Element Zero *Cleared*
Sensor Element Calibration *Cleared*

1. If necessary, enter the Product Settings and Configuration menu by pressing and holding
the MENU button for 6 seconds.

2. Press and release the MENU button until the Return to Factory Default screen appears.

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3. Press the ADD button to return the device to its factory default settings and to advance to
the return to factory default settings confirmation screen. If you do not wish to return the
device to its factory default settings, press the SUB or MENU button to continue to the
Reset Zero & Cal Only screen.

4. If “Yes” is selected to return the device to its factory default settings:

5. Press the ADD button to select “Yes” to confirm that you want to reset the device to its
factory default settings and to return the device to normal operating mode. If you do not
wish to continue to return the device to its factory default settings, press the SUB button to
select “No” to continue to the Reset Zero & Cal Only screen.

6. Use the MENU button to scroll through the rest of the Product Settings and C onfiguration
menu and return to Normal Operating Mode.

NOTE:If the T2A is reset to the factory default settings, ALL configuration steps MUST be

repeated and the device MUST then be zeroed and calibrated for proper operation of
the device.

Reset Zero & Calibration Values

Resetting the zero and calibration settings of the sensor element will allow the currently stored
zero and calibration values to be rest without having to reconfigure all of the other operational
settings like with the Return to Factory Defaults option.

1. If necessary, enter the Product Settings and Configuration menu by pressing and holding
the MENU button for 6 seconds.

2. Press and release the MENU button until the Reset Zero & Calibration Values screen
appears.

3. Press the ADD button to select “Yes” to reset the Zero and Calibration values and to
advance to the Reset Zero & Cal Only confirmation screen. If you do not wish to reset the
zero and calibration values, press the SUB button to select “No” to leave the Product
Settings and Configuration menu and to return the device to normal operating mode.

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4. If “Yes” is selected to reset the zero and calibration values:

5. Press the ADD button to select “Yes” to confirm that you want to reset the Zero and
Calibration values and to return the device to normal operating mode. If you do not wish
to continue to reset the Zero and Calibration values, press the SUB button to select “No”
to leave the Product Settings and Configuration menu and to return the device to normal
operating mode.

6. Press and release the MENU button to return to Normal Operating Mode.

NOTE:If the T2A’s stored Zero and Calibration values are reset, the device MUST be zeroed

and calibrated for proper and safe operation of the device.

Maintenance

RKI recommends that our equipment be calibrated a MINIMUM of every 90 days, and
STRONGLY advise that calibration be performed every 30 days. Without knowing the
specific application, sensor assembly location, gas exposure and other factors, the company
recommends monthly calibrations – assuming no damage or potential damage has occurred to
the sensor and that there has not been a power outage to the sensor assembly. If damage has
occurred or the power supplied to the sensor has changed, a calibration should be completed
immediately.

Scheduled maintenance should include the zero and calibration of the sensor (see page 35)
and an alarm test (see page 24).

The sensor head should be kept free of airborne particles, dirt, mud, spider webs, bugs and
insects, and/or any other debris that could potentially cover or coat the sensor. Keeping the
sensor head clear of foreign articles will allow for proper operation of the device. A brief
inspection during scheduled maintenance should suffice, but dependent upon the location and
the environment in which the unit is installed, more frequent inspections may be warranted.

The T2A may be adversely affected by the exposure to certain airborne substances. Loss of
sensitivity or corrosion may be gradual, if such materials are present in sufficient
concentrations. The performance of the device may be impaired during operation in the
presence of substances that can cause corrosion on gold plating. Continuous and high
concentrations of corrosive gases may also have a detrimental long-term effect on the
product’s service life. The presence of such substances in an area does not preclude the use of
this device, but the likelihood of the shortened lifetime of the sensor element, as a result,
should be noted. Use of the T2A in these environments may require more frequently
scheduled maintenance to ensure safe and reliable system performance.

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Troubleshooting

The troubleshooting guide describes symptoms, probable causes, and recommended action for
problems you may encounter with the T2A.

NOTE:See the controller operator’s manual for problems you may encounter with the

controller.

T2A Fault Codes

Problem Cause(s) Solution(s)

F4
Check
Sensor

The control board has lost
communication with the sensor
interface board.

1. Replace the sensor interface board.

Board
F5

Try to
Zero
Again

The unit did not zero correctly,
due to:

• the presence of gas,

• a sensor error, or

1. Re-zero the device in clear air.

2. Replace the sensor element.

3. Replace the sensor interface board.

• a sensor interface board error.
F6
Try to

Calibrate
Again

The unit did not calibrate
correctly, due to:

• the absence of gas,

• a sensor error, or

• a sensor interface board error.

1. Recalibrate the sensor element and
verify that gas is present during
calibration.

2. Replace the sensor element.

3. Replace the sensor interface board.

If the T2A does not turn on, confirm the presence of 12-35 VDC at the Input Terminal Block
using a DMM set to read in DC volts.

Desiccant Replacement

Each T2A comes with a desiccant bag installed in the junction box. The contents are blue
when it is dry. As the desiccant absorbs moisture, it turns amber. Periodically check the
desiccant and replace it if it has turned amber.

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Sensor Replacement

RKI recommends replacing the sensor element whenever a slow response to gas is observed
during the normal calibration process. After replacing the sensor element, the device MUST
be zeroed and calibrated for proper operation of the device.

WARNING: Do not remove the sensor housing cap or enclosure lid while the circuits are

energized unless the area is determined to be non-hazardous. Keep the sensor
housing cap and enclosure lid tightly closed during operation.

CAUTION: The internal components can be static sensitive. Use caution when opening the

enclosure and handling internal components. DO NOT use any metal objects or
tools to remove the sensing element from the sensor adapter board.

1. Turn off power to the T2A.

2. Unscrew the rain guard.

3. Unscrew and remove the sensor housing cap from the sensor housing base. Set aside.

4. Gently unplug the sensor element from the sensor housing board.

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5. Plug the new sensor element into the sensor housing board. Ensure that the pins on the
sensing element align with the sockets on the sensor housing board.

6. Screw the sensor housing cap back onto the sensor housing base, ensuring that the sensor
housing cap is only tightened hand tight.

7. Press the ADD button to turn the T2A on.

8. Allow the detector to warmup for the appropriate amount of time as shown below,
depending on the sensor type.

Detection Gas Warmup Time

Ammonia 12 hours
Carbon Monoxide 2 hours
Chlorine
Chlorine Dioxide
Hydrogen Chloride 12 hours
Hydrogen Cyanide
Hydrogen Fluoride 2 hours
Hydrogen Sulfide
Nitric Oxide 12 hours

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9. Zero and calibrate the detector as described on page 35.

Calibration

Calibration is the process of evaluating and adjusting the precision and accuracy of
measurement equipment. Although RKI calibrates every device at the factory, for best
accuracy, the detector SHOULD be calibrated in the environment where it is installed.

Detection Gas Warmup Time

Nitrogen Dioxide 2 hours
Oxygen
Ozone
Phosphine
Sulfur Dioxide

Calibration Frequency

A calibration should be performed EVERY thirty (30) days. Days since the last calibration
should NEVER exceed ninety (90) days. RKI recommends that you calibrate your device
regularly to ensure proper functionality and a safe work environment.

Materials

• 0.5 LPM fixed flow regulator with knob

WARNING: If calibrating with Cl2 or HCl, a regulator must be dedicated for use with that

gas only. Do not use that dedicated regulator for any other gases, particularly
H2S.

• calibration cup

• calibration tubing

• zero air cylinder (if not in a fresh air environment)

• calibration cylinder or gas generator (For O

sensors calibrated with Manual Cal, RKI

2

recommends using 100% N2. For O2 sensors calibrated with Auto Cal, RKI
recommends a concentration between 10 and 18% O2. For all other sensors, RKI
recommends using 50% of the full scale value of your detected gas.)

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NOTE:Some detected gases use surrogate gases for calibration. Detected gases needing a

surrogate gas for calibration are listed below. If you are using a surrogate gas for
calibration, that surrogate gas concentration multiplied by the factor listed below
should equal about 50% of the detected gas’ full scale.

Table 2: Surrogate Calibration Gases

Detected Gas

ClO

2

HF Cl

Zeroing the Sensor (20.9% for O

The first step of calibration is zeroing (20.9% for O

Surrogate

Calibration Gas

Cl

2

2

)

2

Factor

1
5

). The zeroing (20.9% for O2) process

2

MUST be performed in known clean air, with no contaminants or hazardous gasses present. If
air quality cannot be guaranteed, a cylinder of zero air will be required to properly zero the
sensor.

1. While the product is in normal operating mode, press the MENU button to activate the
Operation Settings menu.

2. Press the ADD button to begin the zero process and advance to the clean air confirmation
screen.

3. If the sensor is in clean air, press the ADD button to select “Yes” and continue to Step 5.

4. If the sensor is not in clear air:
a. Unscrew and remove the rain guard from the assembly.
b. Install the calibration cup to the T2A’s sensor housing.
c. Screw the regulator into the zero air calibration cylinder.
d. Use the sample tubing to connect the regulator to the calibration cup.
e. Turn the regulator knob counterclockwise to open the regulator.

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f. Allow the gas to flow for 1 minute.
g. Press the ADD button to select “Yes” and continue to Step 5.

5. The unit will automatically begin the 6-second zero process. During the zero, the display
will show a countdown of the time remaining until the process is complete.

NOTE:The zero process cannot be stopped without disconnecting the power from the unit.

6. When the zero process is complete, press the MENU button to advance to the calibration
screen.

7. If a zero air calibration cylinder was used, turn the regulator knob clockwise to close the
regulator.

Calibrating the Sensor (Manual Cal)

Either the Manual Cal screen or the Auto Cal screen appear, depending on how Calibration
Method is set in the Product Settings and Configuration Menu (see page 26).

NOTE:HCl - It is recommended that HCl versions only be calibrated using Auto Cal but they

can be calibrated using Manual Cal, if desired.

O

- If calibrating with 100% N2, you must use Manual Cal. To calibrate using Auto

2

Cal, a gas concentration between 10 and 18% O2 is recommended.

You should ONLY calibrate the sensor after completing the zero process.

1. If you are calibrating with HCl calibration gas, connect the tubing to the regulator, turn the
regulator on, and allow gas to flow for 10 minutes

before proceeding.

2. If you followed the instructions in Zeroing the Sensor (20.9% for O2), the screen below is
displayed.

If you are accessing Manual Cal from Normal Operating Mode, press MENU twice.

3. Unscrew and remove the rain guard from the assembly.

4. Install the calibration cup to the T2A’s sensor housing.

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5. Screw the regulator into the calibration cylinder.

6. Use the sample tubing to connect the regulator to the calibration cup.

7. Turn the regulator knob counterclockwise to open the regulator.

8. After 20-30 seconds, start using the ADD and SUB buttons to adjust the reading to match
the concentration listed on the calibration cylinder.

9. For all calibration gases except Cl
For Cl

and ClO2 calibration gas: Let the gas flow for 6 minutes.

2

, ClO2, and HCl: Let the gas flow for 1 minute.

2

For HCl calibration gas: Let the gas flow for 5 minutes.

10. Use the ADD and SUB buttons to finish adjusting the reading on the screen to match the
concentration listed on the calibration cylinder.

For detectors using a surrogate gas, adjust the reading to match the surrogate gas
concentration multiplied by the factor listed in Table 2 on page 36.

NOTE:Even if the reading does not need adjustment to match the calibration cylinder’s

concentration, you must adjust it up and then back down to reset the Cal field in the
Zero/Calibration Timer Information screen.

11. When calibration is complete, remove the calibration cup from the sensor housing and
reinstall the rain guard.

12. Use the MENU button to return to Normal Operating Mode.

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Calibrating the Sensor (Auto Cal)

Either the Manual Cal screen or the Auto Cal screen appear, depending on how Calibration
Method is set in the Product Settings and Configuration Menu (see page 26).

You should ONLY calibrate the sensor after completing the zero process.

NOTE:O2 - If calibrating with 100% N2, you must use Manual Cal. To calibrate using Auto

Cal, a gas concentration between 10 and 18% O2 is recommended.

1. If you are calibrating with HCl calibration gas, connect the tubing to the regulator, turn the
regulator on, and allow gas to flow for 10 minutes

before proceeding.

2. If you followed the instructions in Zeroing the Sensor (20.9% for O

), the screen below is

2

displayed.
If you are accessing Auto Cal from Normal Operating Mode, press MENU twice.

3. Press the ADD button to select “Yes” to begin the calibration process and to advance to
the calibration confirmation screen. If you do not wish to calibrate the sensor, press the
SUB button to select “No” to advance to the sensor radio address setting screen.

4. Press the ADD button to select “Yes” to confirm that you want to calibrate the sensor and
to continue to the concentration setting screen. If you do not wish to continue to calibrate
the sensor, press the SUB button to select “No” to advance to the sensor radio address
setting screen.

5. Use the ADD and SUB buttons to adjust the concentration match the concentration shown
on the calibration cylinder.

For detectors using a surrogate gas, adjust the reading to match the surrogate gas
concentration multiplied by the factor listed in Table 2 on page 36.

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6. Press the MENU button to save the gas concentration setting and to advance to the
calibration start screen.

7. Unscrew and remove the rain guard from the assembly.

8. Install the calibration cup to the T2A’s sensor housing.

9. Screw the regulator into the calibration cylinder.

10. Use the sample tubing to connect the regulator to the calibration cup.

11. Turn the regulator knob counterclockwise to open the regulator.

12. Press the MENU button to begin calibrating the sensor. The unit automatically begins the
calibration process. During calibration, the display shows a countdown of the time
remaining until the process is complete. The amount of time varies based on the gas type.

NOTE:Once the calibration countdown has started, the process cannot be stopped without

disconnecting the power from the unit.

13. When calibration is complete, remove the calibration cup from the sensor housing and
reinstall the rain guard.

NOTE:If the sensor responds extremely slow, or does not respond to the applied gas, it may

indicate a failed sensor element. The sensor element will need to be replaced before
completing the zero and calibration process.

14. Turn the regulator knob clockwise to close the regulator.

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15. Use the MENU button to Normal Operating Mode.

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Parts List

Table 3 lists replacement parts and accessories for the T2A.

Table 3: Parts List

Part Number Description

47-5110- XX Cable with connector for remot e-m ounted kit (specify length in 1-foot in crements , up to

250 feet, when ordering)
61-2001 Detection junction box for remote-mounted kit, explosion-proof
66-0001 Sensor, carbon monoxide (CO), for up to 1,000 ppm full scale
66-0002 Sensor, oxygen (O

66-0003-1 Sensor, hydrogen sulfide (H

), 25% volume full scale

2

S), 100 ppm full scale

2

66-0004 Sen sor, hydrogen chloride (HCl), for up to 30 ppm full scale
66-0005 Sensor, hydrogen cyanide (HCN), 30 ppm full scale
66-0006-1 Sensor, ammonia (NH

66-0006-2 Sensor, ammonia (NH

), for up to 100 ppm full scale

3

), for 200 to 1,000 ppm full scale

3

66-0007 Sensor, nitric oxide (NO), for up to 250 ppm full scale
66-0008 Sensor, nitrog en dioxide (NO

66-0009-2 Sensor, ozone (O

)

3

66-0010 Sensor, sulfur d i oxide (SO
66-0012 Sensor, chlorine (Cl

), for up to 20 ppm full scale

2

66-0013 Sensor, chlorine dioxide (ClO

), 20 ppm full scale

2

), 20 ppm full scale

2

), for up to 5 ppm full scale

2

66-0014 Sensor, hydrogen fluoride (HF), 10 ppm full scale
66-0015 Sensor, phosphine (PH

), 5 ppm full scale

3

71-0529 T2A Operator’s Manual (this document)
81-0064RK-01 Calibration cylinder, 50 ppm CO in air, 34 liter steel
81-0064RK-03 Calibration cylinder, 50 ppm CO in air, 103 liter
81-0076RK Zero air calibration cylinder, 17 liter
81-0076RK-01 Zero air calibration cylinder, 34 liter steel
81-0076RK-03 Zero air calibration cylinder, 103 liter
81-0078RK-01 Calibration cylinder, 100% nitrogen, 34 liter steel
81-0078RK-03 Calibration cylinder, 100% nitrogen, 103 liter

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Table 3: Parts List

Part Number Description

81-0151RK-02 Calibration cylinder, 25 ppm H2S in nitrogen, 58 liter
81-0151RK-04 Calibration cylinder, 25 ppm H
81-0170RK-02 Calibration cylinder, 5 ppm SO
81-0170RK-04 Calibration cylinder, 5 ppm SO
81-0176RK-02 Calibration cylinder, 25 ppm NH
81-0176RK-04 Calibration cylinder, 25 ppm NH
81-0190RK-02 Calibration cylinder, 5 ppm Cl
81-0190RK-04 Calibration cylinder, 5 ppm Cl
81-0192RK-02 Calibration cylinder, 2 ppm Cl
81-0192RK-04 Calibration cylinder, 2 ppm Cl

S in nitrogen, 34 liter aluminum

2

in nitrogen, 58 liter

2

in nitrogen, 34 liter aluminum

2

in nitrogen, 58 liter

3

in nitrogen, 34 liter aluminum

3

in nitrogen, 58 liter

2

in nitrogen, 34 liter aluminum

2

in nitrogen, 58 liter

2

in nitrogen, 34 liter aluminum

2

81-1050RK Regulator with gauge and knob, 0.5 LPM, for 17 liter and 34 liter steel calibration

cylinders (cylinders with external threads)
81-1051RK Regulator with gauge and knob, 0.5 LPM, for 34 liter aluminum, 58 liter, and 103 liter

calibration cylinders (cylinders with internal threads)
81-1183 Calibration cup with 3 foot tube
81-1184 Rain guard
82-0101RK Magnetic wand

T2A Transmitter • 4 3

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Appendix A: 4-20 mA Signal

This appendix is only an introduction. The information should serve as a brief overview of 4­20 mA current loop signal ranges and should not be considered a complete reference for
proper implementation or use.

Industry standards pertaining to 4-20 mA current loop si gnals and other aspects of electronics
are assumed to be known by the technician. For proper connection to a controller or
Programmable Logic Controller (PLC), refer to the manufacturer’s specific manual or
instructions for that device.

Overview

When using 4-20 mA wired output signal devices, the 4-20 mA defines the current loop
analog signal range, with 4 mA representing the lowest end of the range and 20 mA the
highest. The relationship between the current loop and the gas value is linear. In addition, the
T2A uses values below 4 mA to indicate special status conditions, as shown below:

Current Detector Status

2 mA Sensor Fault
3 mA Sensor in Menu Mode

3.5 mA Sensor being Calibrated

4-20 mA Ranges

The 4 mA allows the receiving controller/PLC to distinguish between a zero signal, a broken
wire, or an unresponsive instrument. Benefits of 4-20 mA convention are that it is: an industry
standard, low-cost to implement, can reject some forms of electrical noise, and the signal does
not change value around the “loop” (as opposed to voltage). The key advantage of the current
loop is that the accuracy of the signal is not affected by a potential voltage drop in the
interconnected wiring. Even with significant resistance in the line, the current loop T2A will
maintain the proper current for the device, up to its maximum voltage capability.

Only one current level can be present at any time. Each device that operates via a 4-20 mA
current loop signal must be wired directly to the controller. Units that are wired in a daisy
chain configuration for the 4-20 mA current loop signal will not properly transmit data
communications to the controller.

Calculations

I(4-20) = Current of loop, measured in mA
value = ppm (or %) of gas concentration
scale = full scale of sensor

44 • T2A Transmitte r

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Measuring Current

If the value measured is 0 mA, then: the loop wires are broken, the sensor assembly is not
powered up, the sensor assembly is malfunctioning, or the controller is malfunctioning. A
digital multi-meter (DMM), or current meter, may be used in conjunction with the controller
and/or to test the 4-20 mA current loop signal. To measure the current, place the meter probes
in line with the current loop.

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