SENS.413347.015RE
4
This user manual (UM) is designed for studying of device, technical specifications and
operation principle of gas detector SENS SG-A1 (hereinafter referred as gas detector).
UM contains technical data, information on maintenance, methodology for verification
and calibration, as well as other information necessary for correct operation, storage,
transportation and keeping constant operational capability of gas detector.
Gas detector corresponds to requirements of CEHC.413347.015 TU.
Abbreviations and designations used in this User Manual:
SSRS - state standard reference sample;
SENS Line
– three-wired line of power and communication for SENS measuring system;
VM - CEHC.413347.010 MP. Gas Detector SENS SG-A. Verification methodology;
LFL - lower flammability limit;
TLV - threshold limit value;
VGM - verification gas mixture;
PT - primary transducer.
1 PURPOSE
1.1 Gas detector is designed for automatic continuous measurement of
underexplosive concentration of combustible gases and vapors, as well as for signaling on
exceeding of specified signaling triggering thresholds.
Gas detector is designed for stationary installation, provides local light indication and
signaling, provides, depending on model, output of information about measured concentration
value using built-in digital indicator, as well as using analogue current output in the form of
unified analog current output signal as per GOST 26.011 and using digital serial interfaces:
- three-wired line of power and communication of measuring system SENS, SENS
protocol;
- RS-485, Modbus protocol;
- HART, HART protocol Revision 6.
Gas detector, depending on the model, provides switching of contacts of two signal
relays when specified threshold of concentration are exceeded or failure occurs.
Models of gas detector are shown in table A.1 of Annex A.
Gas detector may come with cable entries of different models in accordance with figure
E.1 of Annex E.
1.2 Gas detector can be installed at objects in zones of 1 or 2 classes as per GOST
31610.10, in explosion-hazardous zones, with possible appearance of mixtures of combustible
gases and vapors with air - category IIB as per GOST R IEC 60079-20-1, including
temperature group T4 in accordance with GOST 31610.0.
1.3 Range of application - implementation of production control over compliance with
industrial safety requirements, set by legislation of Russian Federation, on operation of
hazardous production object, control of underexplosive concentration of combustible gases.
2 NAME
Name, designation of gas detector, set by Manufacturer and used for purchase order.
«Gas detector SENS SG-A1-I-C3H8-D12»
SENS.413347.015 TU.
Gas detector SENS SG-A1 with built-in digital indicator. Interfaces: CEHC, RS-485,
(4...20) mA, HART, relay; calibration gas - propane, cable entries - D12.
«Gas Detector SENS SG-А1-09-CH4-D18-UKBK»
SENS.413347.015 TU.
Gas Detector SENS SG-A1. Interfaces: CEHC, (4...20) mA; calibration gas - methane;
cable entries - D18, with armored cable mounting device UKBK.
Note - Interfaces in accordance with Annex A, cable entries in accordance with Annex E.
Summary of Contents for SG-A1
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