Performance Specifications; General Specifications; Methane Detector Specifications - GasTech D-Guard2 Operator's Manual

24. APPENDIX G:

24.1. Performance Specifications

24.1.1

General Specifications

Parameter
GS-1 Measurement Techniques
GS-2 Target Gas
GS-3 Full Scale Ranges
GS-4 Measurement Accuracy
GS-5 Maximum Loop Current
GS-6 Minimum Supply Voltage at 20mA
GS-7 Maximum Supply Voltage (Ui) Group I variant
GS-8 Maximum Loop Resistance. Group I variant
GS-13 Maximum Supply Voltage (Ui) Group II variant
GS-14 Maximum Loop Resistance. Group II variant
GS-16 Absolute Maximum Supply Voltage
GS-17 Loop Error Signal (low – electronics fault)
GS-18 Loop Error Signal (low – sensor fault)
GS-19 Display
GS-20 Temperature Sensor
GS-21 Pressure sensing – Ambient (optional)
GS-22 Sensor keep-alive battery (optional)
GS-23 Digital Communications
24.1.2

Methane Detector Specifications

Parameter
SS-1 Gas Type
SS-2 Detection ranges
SS-3 Sensor technology
SS-4 Sensor Size
SS-5 Sensor Life
SS-6 Calibration method
SS-7 Accuracy (scale and linearity)
SS-8 Stated accuracy temperature limits
SS-9 Operating temperature limits
SS-10 Operating humidity range
SS-11 Operating pressure range
SS-12 Humidity/Condensation effects
SS-13 Long term drift
SS-14 Cross Sensitivity
SS-15 Response time
SS-16 Environmental protection
Description / Conditions
Electro-Chemical Cell, Infra-Red.
Depends upon model (see table 2 – gas types and ranges).
Depends upon model (see table 2 – gas types and ranges).
Refer to Sensor Performance tables.
Under any condition of operation or fault.
Minimum operating voltage at detector
Group I maximum input voltage entity parameter (Ui).
At Vpsu = Ui = 22V with backlight (see graph).
Group II maximum input voltage entity parameter (Ui).
At Vpsu = Ui = 28V with backlight (see graph).
Maximum supply voltage no damage to electronics (All versions)
Detected faults within hardware or software
IR Head failure
Graphical display 400 pixels by 240 pixels. High contrast type
Semiconductor temperature sensor
MEMS based absolute value. Instrument body and head.
3.6V 55mAH lithium coin cell. PCB mounted 'encapsulated'
HART 7.0 over 2-wire current loop (refer separate specification)
Methane INFRA-RED
0 – 5% v/v, 0 – 100% v/v
NDIR Infra-Red
20mm diameter
>10 Years
2 point, zero, full-scale
To AS2290.3, ANZ60079.29 and AS4641
0°c to +40°C
-10°C to +40°C
0% to 98%
80kPa to 120kPa
Negligible
Zero: Less than specified by 61779.2 over 3 months
Sens: Less than specified by 61779.2 over 3 months
CO: none. NO: none. H : none
2
T90: <=22 seconds
Replaceable hydrophobic membrane (part of enclosure).
63
D-Guard
Limits
Min
-
-
-
-
13.0
-
-
-
-
-
-
-
-20
50
Specification
2
Units
Max
- -
- -
- -
30 mA
- VDC
22 VDC
380 Ohms
28 VDC
720 Ohms
30 VDC
3.3 mA
3.3 mA
- -
+110 ºC
115 kPa