D-Guard
2
12
7.
INTRODUCTION
7.1.
Purpose and Contents Of This Manual
This manual contains installation, operating and maintenance instructions for the Gastech D-Guard
2
loop-
powered, Smart Gas Detector. Users of this equipment must read and understand the contents of this manual
in order to ensure safe use and optimum performance from the product.
7.2.
Product Identification and Type
The product name is D-Guard
2
. The product classification is as a loop-powered Gas Detector.
Individual D-Guard
2
detectors are identified by a unique serial number located on the product identification /
certification plate fixed to the side of the enclosure. Reference to this label is important to correctly identify the
products certification type. Detectors must only be used in applications for which they are certified. A Group
II certified product must not be used in a Group I application and vice-versa. Additionally a Group IIB certified
unit
MUST NOT
be used in an application requiring a Group IIC certified product.
The gas type and range detectable by the unit are set by the combination of an appropriate sensor type being
installed and by configuration via the set-up menus.
However
- for the product to remain compliant with its
certification, end users are
NOT
permitted to change the gas type measured by substitution of sensor type. This
is only permitted to be carried out by Gastech or an approved Gastech representative.
If such changes are made by Gastech or a representative, the certification label and appropriate traceability
documents will also be replaced where necessary to reflect the changes.
If changes to the gas sensor type are carried out by the end user, product certification will be
invalidated.
End users may change the gas measurement
range and displayed gas name
via the configuration
menus, however GasTech Australia will not accept responsibility for, nor accept liability for damage
or injury caused by instruments rendered unsuitable for any particular application following such
changes. The facility for configuring the detector from within its operating system is intended for use
by GasTech appointed distributors and service teams to allow efficient deployment of the different
product types.
The specific model type does not appear on the product identification plate. The gas type and range for the
detector as supplied from GasTech's factory is displayed clearly on the instrument's display. For instruments
with HART communications, identification of gas type and range is readable. The following table specifies the
default 'as-supplied' product variations along with the certification type.
Gas Type
Full Scale Range
Gastech Part No.
Type Of Certification
Ex ia I
Ex ia IIC
EX ia IIB
Ammonia
0 - 100ppm
65-1080-NH3
Carbon Monoxide
0 - 1000ppm
65-1080-CO
Chlorine
0 - 10ppm
65-1080-CL2
Ethylene Oxide
0 - 20ppm
65-1080-ETO
Fluorine
0 - 1ppm
65-1080-F2
Hydrogen
0 - 2000ppm
65-1080-H
Hydrogen Chloride
0 - 100ppm
65-1080-HCL
Hydrogen Cyanide
0 - 50ppm
65-1080-HCN
Hydrogen Sulphide
0 - 200ppm
65-1080-H2S
Nitrogen Dioxide
0 - 10ppm
65-1080-NO2
Nitric Oxide
0 - 100ppm
65-1080-NO
Ozone
0 - 2ppm
65-1080-O3
Phosphine
0 - 1ppm
65-1080-PH3
Sulphur Dioxide
0 - 10ppm
65-1080-SO2
Oxygen
0 - 25% volume
65-1080-O2
Methane
0 - 5% v/v
65-1080-LEL
NO
Methane
0 - 100% v/v / LEL
65-1080-CH4
NO
Carbon Dioxide
0 – 1.5% v/v
65-1080-CO2
NO
Client Specified
Electrochemical ONLY
65-1080-xxx
xxx = gas type to detect Consult Gastech.
Table 1: Standard Gas types and ranges covered by the D-Guard
2
2-wire range.
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