GDS GDS-68XP, Operation And Maintenance Manual, Page: 11 / 68

GDS-68XP Operation & Maintenance Manual, Revision 3.5
Page 11
Type Target Gas Range Part Number Temp Range Warm ‐ Up
15 Hydrogen Sulfide
0 ‐ 10 ppm to
0 ‐ 5000 ppm
10 ‐ 9815 ‐ Rxxxx 0°C to + 50°C 2 to 4 hours
30 Mercaptan (TBM)
0 ‐ 15 ppm
0 ‐ 50 mg/m3
0 ‐ 3.00 lbs/mmcf
10 ‐ 9830 ‐ R0015
10 ‐ 9830 ‐ R0050
10 ‐ 9830 ‐ R0003
0°C to + 40°C 4 to 8 hours
31 THT
0 ‐ 15 ppm
0 ‐ 3.00 lbs/mmcf
10 ‐ 9831 ‐ R0015
10 ‐ 9831 ‐ R0003
0°C to + 40°C 12 to 24 hours
40 Odorants
0 ‐ 15 ppm
0 ‐ 3.00 lbs/mmcf
10 ‐ 9840 ‐ R0015
10 ‐ 9840 ‐ R0003
0°C to + 50°C 2 to 4 hours
41 Spotleak
0 ‐ 15 ppm
0 ‐ 3.00 lbs/mmcf
10 ‐ 9841 ‐ R0015
10 ‐ 9841 ‐ R0003
0°C to + 50°C 2 to 4 hours
Figure 3-1: Toxic Sensor Characteristics
SEQUENCE
Switch
Sequence
Time
Purge / Hold
Time
Total Cycle Time
(Approximate)
0 On-Demand Sequence 1 hour
1 12-15 min 40 min 1 hour
2 12-15 min 105 min 2 hours
3 12-15 min 165 min 3 hours
4 12-15 min 225 min 4 hours
5 12-15 min 285 min 5 hours
6 12-15 min 345 min 6 hours
7 12-15 min 465 min 8 hours
Figure 3-2: Sequence Timing
RECOMMENDED MINIMUM SAMPLE SEQUENCE TIMES
GAS TYPE MINIMUM COMMENTS
15 HYDROGEN SULFIDE, LOW RANGE (< 50 PPM) 1 HOUR FOR MAXIMUM SENSOR LIFE, USE LONGEST
POSSIBLE SEQUENCE
15 HYDROGEN SULFIDE (> 500 PPM) 2 HOURS FOR MAXIMUM SENSOR LIFE, USE LONGEST
POSSIBLE SEQUENCE
31 TETRAHYDROTHIOPHENE, 0 ‐ 50 MG/M3 2 HOURS TWO HOURS IS REQUIRED FOR COMPLETE
SENSOR RECOVERY FROM METHANE
30 MERCAPTAN, 0 ‐ 50 MG/M3 OR 0 ‐ 3 LB/MCF 4 HOURS FOUR HOURS IS REQUIRED FOR COMPLETE
SENSOR RECOVERY FROM METHANE
40,
41
GENERAL ODORANTS, INCLUDING SPOTLEAK 2 HOURS TWO HOURS IS REQUIRED FOR COMPLETE
SENSOR RECOVERY FROM METHANE
Figure 3-3: Recommended Minimum Sequence Times