TELEDYNE OLDHAM SIMTRONICS Everywhereyoulook MultiToxDGi-TT7-E User manual

NOSP17668-Revision 03a
MULTITOX DETECTOR
MultiToxDGi-TT7-E
DGi-TT7-O
DG-TT7-S
(with Magnetic interface)
OPERATING
MANUAL

MULTITOX DETECTOR
OPERATING MANUAL
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User manuals in other languages are available on
Website https://teledynegasandflamedetection.com
Copyright February 2021 by TELEDYNE OLDHAM SIMTRONICS S.A.S.
All rights reserved. No reproduction of all or part of this document, in any form, is permitted
without the written consent of TELEDYNE OLDHAM SIMTRONICS S.A.S.
All of the information that is provided in this document is accurate to the best of our knowledge.
As a result of continuous research and development, the specifications of this product may be
changed without prior notice.
TELEDYNE OLDHAM SIMTRONICS S.A.S.
Rue Orfila
Z.I. Est – CS 20417
62027 ARRAS Cedex

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Limitation of Liability
The Company TELEDYNE OLDHAM SIMTRONICS S.A.S., hereinafter referred to as “TELEDYNE
OLDHAM SIMTRONICS” throughout this document, shall not be held responsible for any
damage to the equipment or for any physical injury or death resulting in whole or in part from the
inappropriate use or installation of the equipment, non-compliance with any and all instructions,
warnings, standards and/or regulations in force.
No business, person or legal entity may assume responsibility on behalf of TELEDYNE OLDHAM
SIMTRONICS, even though they may be involved in the sale of TELEDYNE OLDHAM
SIMTRONICS products.
TELEDYNE OLDHAM SIMTRONICS shall not be responsible for any direct or indirect damage,
or any direct or indirect consequence, resulting from the sale and use of any of its products
UNLESS SUCH PRODUCTS HAVE BEEN SELECTED BY TELEDYNE OLDHAM SIMTRONICS
ACCORDING TO THE APPLICATION.
Ownership clauses
The drawings, specifications, and information herein contain confidential information that is the
property of TELEDYNE OLDHAM SIMTRONICS.
This information shall not, either in whole or in part, by physical, electronic, or any other means
whatsoever, be reproduced, copied, divulged, translated, or used as the basis for the
manufacture or sale of TELEDYNE OLDHAM SIMTRONICS equipment, or for any other reason
without the prior consent of TELEDYNE OLDHAM SIMTRONICS.
Warning
This is not a contractual document. In the best interest of its customers and with the aim of
improving performance, TELEDYNE OLDHAM SIMTRONICS reserves the right to alter the
technical features of its equipment without prior notice.
READ THESE INSTRUCTIONS CAREFULLY BEFORE THE FIRST USAGE: these instructions
should be read by all persons who have or will have responsibility for the use, maintenance, or
repair of the instrument.
This instrument shall only be deemed to be in conformance with the published performance if
used, maintained, and repaired in accordance with the instructions of TELEDYNE OLDHAM
SIMTRONICS by TELEDYNE OLDHAM SIMTRONICS personnel or by personnel authorized by
TELEDYNE OLDHAM SIMTRONICS.

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Important Information
The modification of the material and the use of parts of an unspecified origin shall entail the
cancellation of any form of warranty.
The use of the unit has been projected for the applications specified in the technical
characteristics. Exceeding the indicated values cannot in any case be authorized.
TELEDYNE OLDHAM SIMTRONICS recommends regular testing of fixed gas detection
installations (read Chapter 7.2).
Warranty
Under normal conditions of use and on return to the factory, MultiTox detectors carry a 1-year
warranty excluding accessories such as tilt mount, weather protection, etc.
Destruction of the equipment
European Union (and EEA) only. This symbol indicates that, in conformity with directive
DEEE (2002/96/CE) and according to local regulations, this product may not be
discarded together with household waste.
It must be disposed of in a collection area that is set aside for this purpose, for example at a site
that is officially designated for the recycling of electrical and electronic equipment (EEE) or a
point of exchange for authorized products in the event of the acquisition of a new product of the
same type as before.

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Table of Contents
1Product description.......................................................................... 1
1.1 Application ..........................................................................................................1
1.2 DGi-TT7-E ...............................................................................................................2
1.3 DGi-TT7-O ..............................................................................................................2
1.4 DG-TT7-S.................................................................................................................2
1.5 Heating (DGi version only).............................................................................3
1.6 Technical specifications .................................................................................3
1.7 Detection cartridge..........................................................................................4
1.8 Commnication Interface................................................................................4
1.9 Product Code.....................................................................................................6
2Techical features .............................................................................. 9
3Scales and technical data ............................................................ 13
4Installation .......................................................................................... 15
4.1 Positioning.............................................................................................................15
4.2 Assembly ...............................................................................................................15
4.3 Electric Connection..........................................................................................18
4.4 Detection cartridge..........................................................................................24
5Commissioning.................................................................................. 27
5.1 Visual inspection ................................................................................................27
5.2 Power-up...............................................................................................................27
5.3 Operational tests ...............................................................................................27
6Operation ........................................................................................... 29
6.1 Environmental conditions...............................................................................29
6.2 Inhibition................................................................................................................30
6.3 Signal current loop............................................................................................31
6.4 Alarm indication ................................................................................................32
6.5 Display indication ..............................................................................................32
6.6 Wireless communication tool TLU600.........................................................34

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6.7 Information menu [INFO]................................................................................37
6.8 Adjustment menu [ADJT]................................................................................38
6.9 Maintenance menu [MAIN] ..........................................................................45
6.10 Magnets operation...........................................................................................46
7Maintenance ..................................................................................... 49
7.1 Open enclosure before Power off..............................................................49
7.2 Periodic maintenance ....................................................................................49
7.3 List of main faults................................................................................................50
7.4 Replacing the cartridge .................................................................................51
7.5 Replacing the complete detector.............................................................53
8Certifications and standards ......................................................... 55
8.1 Functional Safety...............................................................................................55
8.2 ATEX / IECEx Marking........................................................................................55
9ACCESSORIES AND SPARE PARTS .................................................. 57
9.1 Accessories ..........................................................................................................57
9.2 Spare parts...........................................................................................................59
9.3 Gas table codes & range table codes ....................................................60
10 Declaration of conformity .............................................................. 63

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1Product description
The DGi-TT7-E is designed to monitor poisoning risk induced by the presence of toxic gases or
vapours (hydrogen sulphide, carbon monoxide, ammonia...).
The DGi-TT7-O is designed to monitor the oxygen concentration in %vol either for inerting (scales
1 or 5%vol.) or in breathable atmosphere control (Scale 0-25%vol).
Both versions are equipped with electrochemical cells.
The DGi-TT7-S is designed to monitor poisoning risk induced by the presence of toxic gases or
vapours, such as hydrogen sulphide. This version is equipped with semiconductor cells.
Detectors can be connected to a large range of controllers or PLC.
These detectors may be configured using the portable communication terminal (TLU600) in ATEX
areas, providing flexibility to the user.
These detectors can be configured also using the magnetic wand or the Hart portable terminal
TLH700 (in option).
MultiTox are also available for use in an addressable network system with distributed intelligence
SYNTEL. For more information, please refer to the Syntel module interface operating manual.
1.1 Application
The DGi-TT7 and DG-TT7 are suitable for indoor or outdoor use and offer a fast response time.
Typical applications include:
•Storage of toxic products
•Monitoring of processes with toxic products
•Oxygen detection in inert atmosphere (DG-TT7-O)
•Chemical and petrochemical plants
•Drilling platforms
•Refineries

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1.2 DGi-TT7-E
The DGi-TT7-E is a MultiTox detector based on a transducer with electrochemical cell, which
requires oxygen to function properly.
The measuring principle is based on a redox reaction.
In the event of a long period without oxygen, the measurement will not be representative of gases
or vapours concentration.
The characteristics of the device can also be altered by exposures to high concentrations or by
extended periods in hot and dry atmosphere.
1.3 DGi-TT7-O
The DGi-TT7-O is a MultiTox detector based on a transducer with electrochemical cell. The
measurement range is expressed in %vol O2.
The measuring principle is based on one of the principle of the « oxygen cell ».
There are two types of cell:
•Type M corresponding to device DGi-TT6-42BJ-EA*-M*
•Type Y corresponding to device DGi-TT6-42BJ-EA*-Y* (specific lifetime)
Characteristics of the device can also be altered by exposures to extended periods in hot and
dry atmosphere.
1.4 DG-TT7-S
Le DG-TT7-S is a MultiTox detector based on a transducer with semi-conductor cells, which
requires oxygen to function properly. It is used mainly for hydrogen sulphide detection in difficult
industrial environment.
The measuring principle is based on oxidation and adsorbing reactions on films surface of
heated semi-conductor.
This sensor uses a sensitive element that only requires half-yearly calibration and does not
require any injection of high concentration gas to reactivate his sensitive element.
The measurement will not be representative anymore of the concentration of gases or vapours if
the detector is exposed too long time without oxygen or in a very dry atmosphere.
Characteristics of the device can also be altered by the presence of some poisons, such as silicon
vapours.

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1.5 Heating (DGi version only)
In hard environmental conditions, with condensation or frost, gases and vapours may not reach
the sensor. The device takes into account this difficulty and keeps its temperature slightly above
that of the ambient atmosphere.
1.6 Technical specifications
Each detector is constructed as follows:
•A wall-mounted support secured by three screws and including cable gland (M20)
(optional). There are 2 standard entries and an optional one.
•A stainless steel explosion-proof housing containing:
- A set of tropicalized electronic cards
- A display and infrared communication electronic card. Allowing the
communication with the remote control (TLU600)
•A colour coded cartridge with a label located in the lower part of the detector, a green
one for the toxic gas detectors with electrochemical cell (DGi-TT7-E), a blue one for the
oxygen deficiency gas detectors with electrochemical cell (DGi-TT7-O) and an orange
one for semi-conductor toxic gas detectors (DG-TT7-S)
The cartridge is connected to the detector’s body by an open ring leaving the label visible.
A colored ring enables the identification of the device type at a larger distance.
•A metallic support cable (optional) connects the wall mounting support and the housing,
which makes the maintenance easier.
Figure 1 : Layout drawing

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1.7 Detection cartridge
Detection cartridges are:
•Intrinsic safety “ia” for the DGi-TT7-E- and DGi-TT7-O versions. They can be removed
when the detector is powered.
•Explosion proof “d” for the DG-TT7-S versions. They cannot be removed when the
detector is powered.
They are common to all TELEDYNE OLDHAM SIMTRONICS MultiTox products in order to reduce
the number of spares parts.
•DGi-RT7-E / DGi-RT7-O et DG-RT7-S: Network versions for Syntel loop,
•DGi-TT7-E / DGi-TT7-O et DG-TT7-S: « Telecapteur » versions,
Storing electrochemical cartridges (green or blue label) for long periods is not
recommended, as their lifetime is short. Cartridges should be used within 6 months (from
the date of purchase).
In order to guarantee the metrological characteristics of the device, the cartridges must be stored
in their original packaging until commissioning and in clean atmosphere (no vapor of solvant).
For a long-term storage, the cartridges will be stored in a dry place, between 5°C and 20°C.
After a long storage period, more than one month, the cartridge will be stabilized for several
hours, in order to perform the nominal characteristics.
1.8 Commnication Interface
1.8.1 Wireless Configuration Tool
Information and status of the detector are available via the wireless configuration tool TLU600.
Configuration and tests are performed using this wireless configuration tool (IrDA protocol). This
tool is common for all TELEDYNE OLDHAM SIMTRONICS MultiFlame, MultiXplo and MultiTox
products.
The TLU600 provides access to devices that, otherwise, would require
major logistic operations for maintenance or for configuration
(calibration…).
For more details, please refer to the wireless configuration tool operating
manual.

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1.8.2 Magnetic wand
The Type-D electronic version includes two magnetic sensors PG1 and
PG2 implanted on the numeric card.
The communication interface is a magnetic wand. The wand gives access
to information, state and configuration about the detector as the TLU (see
§6.10).
1.8.3 HART communication
The HART communication authorizes an addressing of devices,
allowing the communication in read/write mode.
It consists in getting connection on the current loop on which the
numerical data are superimposed.
Most of the HART terminal can read these information and send
commands
The use of a DD (Device Descriptor) facilitates the interface Man-
Device. It can be uploaded on our website.
The HART output is an option. It is available only on the devices equipped with an
electronic type C, in HART configuration (H):
DGi
-**7-****-**H-**-***-*-C-
*
TELEDYNE OLDHAM SIMTRONICS devices under HART
protocol enable the use of all the functions available with the
TLU600 via the HART terminal
See the document D1401002 for the using of Hart terminal TLH700 (the Detector Device
Descriptor must be downloaded).

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1.9 Product Code
Product codes are created from functional codes defined as below:
DGi-*T7-****-***-**-***-*-*-* et DG-*T7-****-***-**-***-*-*-*
Detector type
T
T
7
31
AF
-S
X
H
-C
0
-00J
-0
-D
-0
C**
Compact Sensor
T**
Télécaptor
R**
Network version
S**
Replacement cell
X**
Accessories
Families
*T*
Toxic
*V*
Flame
*X*
Flammable gas
*0*
None
Version
**6
BT606 housing
**7
BT10 housing
Gas type
**
Refer to gas matrix
Measurement range
**
Refer to gas matrix
Type
XV
UVIR2
XT
IR3
XW
UV
Detection range
A0
Standard range
B0
Long range
Input Type
0**
Not used or flame
DGi-TT7-E/O & DMi-TT6-E/O
E**
Electrochemical
DG-TT7-S / DM-TT6-S
S**
Semi-conductor
K**
Catharometer
X**
Catalytic
M**
MECH
R**
TOR input
C**
Current input 0/22 mA
I**
Infrared
W**
½ Wheatstone bridge
Variant
*A*
Aluminium
*X*
SS316
Output Interface
**M
1-2 mA protocol
**A
0-22mA protocol (fault signalling in 0-4mA range)
**E
4-20 mA protocol (Common fault signal 2 mA)
**H
4 – 20 mA / 0-22 mA configurable & HART protocol
**C
4 – 20 mA / 0-22 mA configurable
**W
Wheatstone
**L
LON
**X
4 – 24 mA for compact explosimeter (magnet)

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T
T
7
31
AF
-S
X
H
-C
0
-00J
-0
-D
-0
Cartridges
0*
No cartridge or not specified or flame
DGi-TT7-O / Dmi-TT6-O
M
* Electrochemical type M
G*
Electrochemical type G
Dgi-TT7-E / Dmi-TT6-E / DGi-TT7-O / Dmi-TT6-O
Y*
Electrochemical type Y
N
* Electrochemical type N
DG-TT7-X / DM-TT6-X
X*
Catalytic
DG-TT7-S / DM-TT6-S
S
* Semi-conductor (general designation for semiconductor type G)
F*
Semi-conductor type 30 (previously SF) since 2015
C*
Semi-conductor type 31 since 2015
DG-TT7-K / DM-TT6-K
K*
Catharometer
Half Wheatstone bridge probes
E*
EX05, EX09 (external)
L*
SX202-16
T*
SX202-10
U*
SX202-14
V*
SX202-17
H*
MTHX-S
J*
MTHX ( / , E, N, NE)
W*
SD122
Z*
SD122-01
DG-TT7-I / DM-TT6-I
D*
Infrared type D
P*
Infrared type P
Semicond.Sensor type & special configurations
*
0
Not specified or standard
DG-TT7-S / DM-TT6-S
*A
20
*B
23
*C
24
*
D
25
*E
27
*F
30 (become obsolete to release *R association)
Options
*K
SD122 (EK)
*
M
Special version MarED (TX6 and TV6 in type A only)
*
N
Special version with ALRM LED not memorized (not in
compliance with EN 54-10) (flame version only)
*R
With relay board for HW type D (gas)
*T
MTHX-S (ET)
*X
SX202 (EX)
Customized versions *
1
Customized EPR (special follow up, SP4M20)
(DM and DMi only)
*
2
Configuration
000
Standard
**A
Absolutely no grease
**B
Special version MarED (old code)
(TX6 and TV6 in type A only)
**C
Not EN 54-10 compliant version (not latched ALRM
LED) (type A only)
**D
IRDA cap instead of display
**E
0V not connected to housing ground on Tox type C
**F Certified telecaptor instead of IRDA cap
**G
Hydrocentrifugon paint (nuclear applications)
**H
Special paint : light grey (10A03 according to
« British standards 4800/5252 »)
**J
Special paint : red (RAL 3001)
**K
Machining of additional cable gland input
*L* Paint thickness > 200 µm(ATEX versionIIB)

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T
T
7
31
AF
-S
X
H
-C
0
-00J
-0
-D
-0
Language
0 Fr / GB
F French
E
English
P Portuguese
C
Chinese
Hardware version
A Type 63
B
Type 65
C
Type 67 (HART)
D Type 69 (magnet)
Software version
0 Standard

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2Techical features
GENERAL
Type Gas detector
DGi-TT7-E MultiTox (electrochemical for toxic components)
DGi-TT7-O MultiTox (electrochemical for measurement of oxygen)
DG-TT7-S MultiTox (semi-conductor for toxic components)
DGi-RT7 / DG-RT7 Network detector
Calibration1A test is recommended every 3-4 months on DGi -TT7-E and
DGi-TT7 and every 6 months on DG-TT7-S.
OUTPUT SIGNALS
Loop 4-20mA signal Type active (source) maximum load impedance 700Ω
« 4-20mA » format 4-20mA with one fault level
(Factory set) 0% full scale 4 mA
100% full scale 20 mA
105% full scale 20.8 mA
Fault or inhibition 1.5 mA
« 0-22mA » format 4-20mA with several fault levels, for PLC and some recent
control units
0% full scale4 mA
100% full scale20 mA
>105% full scale20.8 mA
Inhibition 3.4 mA
Fault measure2.6 mA
Device fault (HW/SW)2.0 mA
Output relays 3 x configurable relays max 1.7A / 30V AC/DC (optional) 2
1These frequencies of calibration control are provided for information purposes only. The frequency depends on
the operating conditions, the experience and safety requirements.
2This value changes to 1A when the security function uses the relays and the SIL level is required

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POWER SUPPLY 24VDC,(18 – 35 V DC on versions DGi-TT7 or DG-TT7-S)
(18 – 30 V DC on versions DGi-RT7 or DG-RT7-S)
Consumption
DGi-TT7
DG-TT7-S
Typical
3
1.4 W
Network : 2.8 W
1.6 W
Network : 3.1 W
Maximum 15W 5W
Wiring 0,5mm² (20AWG)-2,5mm² (13AWG)
MTBF 303 600 h (Version DGi-TT7-E/O out of the cell)
392 500 h (Version DG-TT7-S including the cell)
ENVIRONMENT
Storage temperature see Operating (without cartridges)
5°C / 20°C with the cartridges type -E or –O
Please refer to comments on storage conditions - §1.7
Operating Please refer to table §3
Pressure 1013 Hpa ± 10%
Humidity 15 - 90% RH non condensing (version DGi-TT7-E/O)
5-100% RH non condensing (version DG-TT7-S)
Protection IP66
RFI/EMI EN 50270
Heating time460 sec to 120 sec depending on the version
3Typical power: voltage 24 Vdc, current 4 mA, display brightness 20%, temperature > 5°C (heating not
activated)
Maximum power: voltage 35 Vdc, current 22 mA, maximum display brightness, relay card option, maximum
heating
4The indicated warm-up time corresponds to the duration of inhibition measurement when powered on. It prevents
from triggering alarms while signal is reaching its stabilised level. Nominal performances might be reached only
after a stabilisation period.

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Stabilization time stabilization time 1st implementation or up to 24h after being
powered off:
-DGi-TT7-E : 2 hours
-DGi-TT7-O (type M): 10 min
-DGi-TT7-O (type Y): 1h30
-DG-TT7-S : 16 to 24 hours
EXPLOSION PROOF HOUSING
Material Stainless steel 316 L
Weight 4.0 kg
ATEX/IECEx : Please refer to §8.2
DIMENSIONS
Figure 2 : Outline drawing (mm)

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FUNCTIONAL SAFETY (DG-TT7-S)
SIL SIL certified based on IEC/EN 61508 part 1 to 7 (2011) standards
Certification delivered by LCIE Bureau Véritas
•The safety function is either integrating the 4/20 mA current loop, as an output, or the relays
one
•PFD calculation is based on a 12 months verification frequency and a 24 hours MTTR, out of
the cell
CURRENT OUTPUT
Detecteur
Donnée
Definitions
Valeur
MultiTox
DG-TT7-S
λFailure rate per hour 7.35x10-6/h
SFF
Safety fraction failure (T1= 12 mois)
91.4 %
PFD
Probability of failure on Demande
2.80x10
-3
PFH
Probability of failure / h (1oo1)
6.34x10
-7
MTTR
Mean Time To Repair
Fault on cartridge
16 min
Fault on Detector 26 min
MTTR utilisé pour le calcul du PFD 300 min
SIL
compliance HFT = 0 / G.Fixed / 30°C / type B 1
RELAY OUTPUT
Detecteur
Donnée
Definitions
Valeur
MultiTox
DG-TT7-S
λFailure rate per hour 7.18x10-6/h
SFF
Safety fraction failure (T1= 12 mois)
88.9 %
PFD
Probability of failure on Demande
3.50x10
-3
PFH
Probability of failure / h (1oo1)
7.94x10
-7
MTTR
Mean Time To Repair
Fault on cartridge
16 min
Fault on Detector
26 min
MTTR utilisé pour le calcul du PFD 300 min
SIL
compliance HFT = 0 / G.Fixed / 30°C / type B 1
The above values are corresponding to electronic type C which has been certified with HW
Tyce C.
Updated SIL certificate for type D is pending (expected values will be at least equivalent to type
C)

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3Scales and technical data
O2
DGi-TT7-O
Type M
O2
DGi-TT7-O
Type Y
H2S
DGi-TT7-E
H2S
DG-TT7-S
NH3
DGi-TT7-E
CO
DGi-TT7-E
NO
DGi-TT7-E
NO2
DGi-TT7-E
H2
DGi-TT7-E
SO2
DGi-TT7-E
Cl2
DGi-TT7-E
HCl
DGi-TT7-E
HCN
DGi-TT7-E
Measurement
range 
0-5
%vol
0-20
0-50 0-20
0-50
0-50
0-100
0-100
0-200
0-100 0-20
0-2000
0-20
0-10
0-50
0-100 0-50
0-25
%vol
0-25
%vol
0-100
0-200 0-1000 0-500 0-1000 0-10000 0-50
 (0-50%) (sec)
 (0-90%) (sec)
< 8
< 25
< 10
< 20
<13
< 35
<30
< 70 < 120 < 35 < 20 < 45 < 70 < 30 < 30  < 150 < 60
Zero point
stability 
< 0.1
%vol
<0.3% vol
± 1 ppm
<1 ppm
± 2 ppm
± 4 ppm
± 3 ppm ±0.5ppm
±40 ppm
±0.5ppm ±0.5ppm ± 3 ppm ± 1 ppm
± 2 ppm ±20 ppm ± 10ppm ±200 ppm
T° range
(°C)
-10/+40 -40/+60 -20/+50 -40/+65 -20/+40 -20/+50 -20/+50 -20/+50 -20/+50 -20/+50 -20/+40 -20/+50 -20/+40
Accuracy

5 % Ech.
± 2 ppm
± 10 %
reading
± 2 ppm
± 10 %
reading
± 4 ppm
± 10 %
reading
± 4 ppm
± 10 %
reading
± 4 ppm
± 10 %
reading
± 2 ppm
± 10 %
reading
± 50 ppm
± 5 %
reading
± 2 ppm
± 10 %
reading
± 2 ppm
± 10 %
reading
± 4 ppm
± 10 %
reading
± 2 ppm
± 10 %
reading
4 % Ech ± 1.5%
Ech
± 4 ppm
± 10 %
reading
± 25 ppm
± 10 %
reading
± 15 ppm
± 10 %
reading
± 50 ppm
± 5 %
reading
Lifetime
(months)
12 à 18 5 ans 24 60 24 36 36 24 24 24 24 24 18
Warming-up time
or polarisation 
< 10 min 1h30 < 10 min < 60 min < 10 min < 10 min < 60 min < 10 min < 10 min < 10 min < 10 min < 60 min < 10 min
Gas injection time
(ref)
1’ 1’ 3’ 3’ 4’ 2’ 1’ 2’ 4’ 2’ 2’ 4’ 3’
Table 1: performances
In ppm unless otherwise indicated.
Long term stability (21 days) under stable environmental conditions.
On the range: 0°C to 40 °C.
< 120 seconds at the 1st exposure.
The precision is estimated based on replication, linearity and temperature parameters.
Select the higher value where two tolerances are proposed.
Concerning the 0-100 ppm version, the accuracy is 20% on the range 50-100ppm
For a 6 hours powered-off time

MULTITOX DETECTOR
OPERATING MANUAL
14
NOSP17668
Revision 03a
DG-TT7-S detectors: The silicone compounds are known to have poisoning effects
on the semi-conductor element.
DGi-TT7-O detectors (type M): High CO
2
concentration (several %vol.) is known
to have poisoning effect on the cell. In a similar way, solvents higher than 1000
ppm will gradually damage the cell.
DGi-TT7-O detectors (type Y): the solvent with alcohol and the alcohol containing
antiseptic p
roducts, such as wipes and sanitizing gels have an impact on
measurement.
DGi-TT7-
O detectors: The measure is proportional to the partial pressure of
oxygen in the measured mixture.