55
Ultima MOS-5 Detector
9.3 Specifications
9.3.1 System
Specifications
Sensor Type:
Continuous diffusion, adsorption type metal oxide semiconductor
(MOS)
Sensor Life:
3 to 5 years typical
Repeatability:
Long Term Drift:
+2 ppm or 10% of the applied gas, whichever is greater
±2 ppm or 10% of reading, whichever value provides the wider
tolerance (as defined per ISA-92.0.01)
Response Time
Typical:
T
50
< 14 seconds (screen); T
50
< 30 seconds (sintered)
with full scale gas applied according to ISA 92.0.01
Measuring Ranges:
0-20 ppm, 0-50 ppm, 0-100 ppm
Modes:
Calibration, gas check, setup
Approvals:
CSA/FM:
Class I, Division 1, Groups B, C, D T6; T
amb
= -40°C to
+60°C (FM); -40°C to +75°C (CSA)
CSA:
Ex d IIB + H
2
T5 Gb (Tamb = -40°C to +70°C)
ATEX/IECEx:
II 2 G Ex d IIB+H
2
T5 Gb (T
amb
= -40°C to +70°C)
Warranty:
Two years
9.3.2 Mechanical
Specifications
Length:
6.4 inches (161 mm)
Height:
3.4 inches (86 mm)
Width:
4.1 inches (104 mm)
Weight:
5.5 lbs. (2.5 kg) – AL, 14.0 lbs (6.4 kg) – SS
Mounting Holes:
Housing:
5.0 inches (127mm) (center to center)
Aluminum alloy (6061-T6 cover, A356-T6 base) or 316 stainless
steel
9.3.3 Electrical
Specifications
Input Power:
24 VDC nominal, 20 to 36 VDC, 350 mA max.
Power Consumption
Start-up 270 mA, Normal Operation 120 mA
Relay Ratings:
8 A @ 250 VAC / 8 A @ 30 VDC resistive max.
(3x) SPDT - Warning, Alarm & Fault
Analog Signal:
HART not
enabled
HART
HART
modified AO
Malfunction
0 mA
3.5 mA
1.25 mA
Calibration
1.5 mA
3.5 mA
1.5 mA
Gas Check
1.5 mA
3.5 mA
1.5 mA
Setup mode
1.5 mA
3.5 mA
1.5 mA
Startup
4.05 mA
4.05 mA
4.05 mA
Zero reading
4.05 mA
4.05 mA
4.05 mA
0-100% LEL
4-20 mA
4 – 20 mA
4.0 – 20 mA
Over-range
20-22 mA
20 – 21.7 mA
20 – 21.7
mA
Status Indicators:
Three-digit digital display with gas concentration, warn and alarm
LEDs, calibration prompts, fault codes, and setup options
RS-485 Output:
Dual Redundant Modbus RTU, suitable for linking up to 128 units
or up to 247 units with repeaters
Baud Rate:
2400, 4800, 9600, or 19200 BPS
