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7. INTRODUCTION
7.1.
Purpose and Contents Of This Manual
This manual contains installation, operating and maintenance instructions for the Gastech D-Guard
2
Guard
S current loop / 3 wire powered, Smart Gas Detectors. 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 products are named D-Guard
and flammable gas detectors (no relays or sounder), or as 3-wire connected toxic and flammable gas detectors
when fitted with either the relay option (R version) or both relay and sounder (S version).
Individual detectors are identified by a unique serial number located on the product identification plate fixed to
the side of the enclosure. Reference to this label is important to correctly identify the product build and gas
type. Detectors must only be used in applications for which they are compatible.
2
D-Guard
R and D-Guard
explosion protected Ex certified equipment.
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
warranty, 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 changes to the gas sensor type are carried out by the end user, product warranty will be
invalidated.
End users may change the gas measurement range and displayed gas name via the configuration
menus and / or HART communications, however Gastech 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
primarily intended for use by GasTech appointed distributors and service teams.
The following table specifies the default 'as-supplied' product variations.
Gas Type
Full Scale Range
Ammonia
0 - 100ppm
Carbon Monoxide
0 - 1000ppm
Chlorine
0 - 10ppm
Ethylene Oxide
0 - 20ppm
Fluorine
0 - 1ppm
Hydrogen Chloride
0 - 100ppm
Hydrogen Cyanide
0 - 50ppm
Hydrogen Sulphide
0 - 200ppm
Nitrogen Dioxide
0 - 10ppm
Nitric Oxide
0 - 100ppm
Ozone
0 - 2ppm
Phosphine
0 - 1ppm
Sulphur Dioxide
0 - 10ppm
Oxygen
0 - 25% volume
Methane
0 - 5% v/v
Methane
0 - 100% v/v / LEL
Carbon Dioxide
0 – 1.5% v/v
Client Specified*
xxx = gas type/range
*Toxic gas types only
Table 1: Standard/Custom Gas Types and Ranges covered by the D-Guard
2
2
R and D-Guard
S. The products classification are either as loop-powered toxic
2
S are non-Ex certified detectors and MUST NOT be used in applications requiring
Base Models
65-1080G-NH3
65-1080G-CO
65-1080G-CL2
65-1080G-ETO
65-1080G-F2
65-1080G-HCL
65-1080G-HCN
65-1080G-H2S
65-1080G-NO2
65-1080G-NO
65-1080G-O3
65-1080G-PH3
65-1080G-SO2
65-1080G-O2
65-1080G-LEL
65-1080G-CH4
65-1080G-CO2
65-1080G-xxx
Gastech Part No.
Optional Relays Fitted
65-1080R-NH3
65-1080R-CO
65-1080R-CL2
65-1080R-ETO
65-1080R-F2
65-1080R-HCL
65-1080R-HCN
65-1080R-H2S
65-1080R-NO2
65-1080R-NO
65-1080R-O3
65-1080R-PH3
65-1080R-SO2
65-1080R-O2
65-1080R-LEL
65-1080R-CH4
65-1080R-CO2
65-1080R-xxx
2
2
G, D-Guard
R and D-Guard
12
2
D-Guard
2
R and D-
Relays and sounder/strobe fitted
65-1080S-NH3
65-1080S-CO
65-1080S-CL2
65-1080S-ETO
65-1080S-F2
65-1080S-HCL
65-1080S-HCN
65-1080S-H2S
65-1080S-NO2
65-1080S-NO
65-1080S-O3
65-1080S-PH3
65-1080S-SO2
65-1080S-O2
65-1080S-LEL
65-1080S-CH4
65-1080S-CO2
65-1080S-xxx
2
S ranges.
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