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Cermet II I.S. Online Hygrometer with
Intrinsically Safe Sensor |
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The Cermet II I.S. is an easy to
install, self-contained hygrometer system for measurement of the moisture
content of flammable and non-flammable gases within hazardous areas. It
comprises an intrinsically safe transmitter, Transmet I.S., and a safe area
Cermet II I.S. Control Unit. Housed in a stainless steel case, the Transmet
I.S. transmitter offers Ingress protection to IP66 (NEMA 4X).
The Cermet II I.S. Control Unit is a 19" sub rack unit
containing display, transmitter power supply and isolation barriers suitable
for location in a designated safe area. It provides all necessary user
interfacing, including multi-unit display, alarms, analogue and digital
outputs. Control unit and transmitter are connected by up to 500m of
cable via galvanic isolation barriers.
Caractéristiques produits
- ATEX, FM, and CSA Certified
- Pressure sensor input
- Measurement accuracy ±1°C dew point
- User selectable measurement units
- Up to 4 alarm relays
- Wide measurement range, calibrated -100 to +20°C
dew point
- Analogue and digital output
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Spécifications techniques |
| Measurement Range |
-100 to +20°Cdp |
| Accuracy |
±1°C from +20 to
-60°Cdp
±2°C from -60 to -100°Cdp |
| Other Units |
Digital processing and linearisation
with pressure compensation from measured dew point with pressure compensation
to any other preferred unit - lb/MMSCF and mg/m³ (for natural gas), ppmV
with active or passive pressure compensation |
| Pressure Input |
Fixed value (user programmed) or
dynamic measurement with an optional 4-20 mA pressure transmitter |
| Resolution |
0.1 °Cdp, 0.1 °Fdp,
0.01 ppmV, 0.1 mg/m³, 0.01 lb/MMSCF |
| Analogue Output |
4-20 mA isolated (max load 600 W) |
| Sensor Calibration |
Traceable to British (NPL) and American
(NIST) National Humidity Standards |
| Power Supply |
Universal 85 to 265 V AC; 90 to 370 V DC |
| Alarms |
Two user-adjustable alarms for set points and
operating configurations |
| Mounting Panel |
10" anodised aluminium, 3U high 132 x
200mm clearance depth |
| Additional PSU |
For Transmet I.S. 24 V DC clip-on rail
type |
| Barriers |
2 galvanic isolation type |
| CONTROL UNIT OPTIONS |
| Power Supply |
Low voltage version 18 to 36 V AC; 9 to
60 V DC |
| Relays |
1 or 2 further 5A relays (max 4 in
total) n/o type fully user configurable: can accommodate full range plus full unit
choice and sensor fault alarm functions |
| Outputs |
Analogue: 0-10 V fully user
configurable and scaleable for range
Digital: RS485: provides 2-way
communication-full data access to user plus total availability of all set-up and
configuration |
| TRANSMET I.S. TRANSMITTER |
| Sensor Thread |
5/8" UNF parallel |
| Case |
Stainless steel |
| Ingress Protection |
IP66 (NEMA 4X) |
| Power |
Derived from Cermet II I.S. control
unit |
| Operating Temperature |
-20 to +60°C |
| Storage Temperature |
-40 to +70°C |
| Operating Pressure |
From vacuum to 30 MPa (300 barg)
max |
| Flow Rate |
0-10 l/min |
| Gas Velocity |
20 m/sec (max) |
INTERCONNECTING SENSOR CABLE
OPTIONS: |
Field cable spec
polyethylene insulated instrumentation cable to BS5308 Part 1-two
collectively screened dual conductors 0.5mm²
Polyethylene bedding,
galvanised steel wire armour, and PVC flame retardant outer sheath in blue. Low
smoke and fume or halogen free outer sheath options available
Max length
500m (greater dependent upon cable spec) |
SAFETY ASPECTS |
| The Cermet II I.S.
Hygrometer meets the requirements of BS5345: Part 1: 1989 and other European
codes of practice for Zone 1 potentially hazardous area operation of the sensor
and sample conditioning system to analyse gases of all gas groupings inclusive
of IIC. The Cermet II I.S. Control Unit must be located in a designated
non-hazardous area (or in an optional EExd housing). Transmet I.S. is ATEX
certified by EECS for use in hazardous areas to II 1G EEx ia IIC T4 when used
with a pair of isolation or shunt diode barriers for signal and power supply
connections. Transmet I.S. has been FM listed (USA) CL1, Div1, GpA, B, C & D,
T4 and CSA (Canada) certified to Ex ia (Class 1, Groups A, B, C & D). |
Applications |
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