- Brand: Michell Instruments
A robust, linear and stable thermal conductivity analyzer for
measurement of binary gas mixes
such as air in hydrogen, nitrogen, argon, helium or carbon-dioxide. The
sensor is housed in a
rugged casing, making it suitable for a wide range of applications. The
analyzer can be supplied explosion-proof and suitable for hazardous
areas.
Product Features
- Suitable for use in ATEX, IECEx, TC TR Ex & CCSAUS certified Hazardous Areas
- Optional status LED’s following NAMUR standard
- Compact and rugged design with an EExd enclosure and 4-20 mA output
- Touch-screen display allows calibration or adjustment without the need for a hot works permit
- Accuracy of better than ±2% full scale
- IP66 rated enclosure
- Low cost of ownership due to minimal maintenance
- Ranges available: 0-5 up to 0-100%, 0-1% for H2 or He
- Stability ±0.5% per month (of span)
Technical Specifications
| Performance | |
| Measurement Technology | Thermal Conductivity sensor |
| Measured Gases | Air, Ar, CH4, CO2, H2, He or N2 (more available on request) |
| Gas Requirements | Non-condensing sample with particles ±3μm |
| Measurement Range | Selectable from 0-5 up to 0-100% 50-100% up to 99-100% |
| Measurement Range (H2 & He) | Selectable from 0-1% up to 0-100% 50-100% up to 99-100%* |
| Display Resolution | 0.1% |
| Display Type | Backlit LCD |
| Intrinsic Error (Accuracy) | < ±2% of span** |
| Response Time (T90) | Standard < 20 seconds** |
| Repeatability | ±0.2% of span |
| Linearity | ±1% span |
| Zero Stability | ±0.5% of span per month |
| Span Stability | ±0.5% of span per month |
| Sample Flow Rate | 100 to 500 ml/min (0.2 to 1.27 scfh) |
| Sample Flow Rate(Ex) | 270 to 330 ml/min (0.54 to 0.66 scfh)) |
| Sample Flow Effect (calibrated at 300 ml/min) | < 1% of span for flows: 100 to 500 ml/min |
| Sample Pressure | Analyzers are callibrated at atmospheric pressure and must be operated with an atmospheric vent, unless otherwise stated |
| Maximum Safe Pressure | 4 barg (58 psig) |
| Sample Temperature | 5 to 45°C C (+32 to +104°F) max |
| Sample Cell Temperature | +50°C (+122°F) |
| Electrical Specifications | |
| Analog Inputs | 2 off 4-20 mA inputs One for an external sensor that can be displayed on the screen One to act as an active compensation for the process conditions |
| Analog Outputs | 2 off 4-20 mA outputs |
| Output Ranges | Primary range is set to the calibrated range of the instrument The second is user selectable |
| Alarms | 2 off single pole changeover (SPCO) relays (250 V, 5 A max) |
| Datalogging | The user can use the digital communications to log the output from the analyzer The unit will store 40 alarm points and the min/max O2 concentrations with date and time stamp |
| Digital Communications | MODBUS RTU over RS485 Protocol |
| Power Supply | 24 V DC; 1.5 A max |
| Operating Conditions | |
| Ambient Temperature | 0 to 40°C (32 to 104°F) |
| Mechanical Specifications | |
| Warm Up Time | < 25 minutes |
| Stabilization Time | 5 minutes |
| Dimensions | 172 x 234 x 234mm (h x w x d) |
| Weight | 9.7kg |
| Wetted Materials | 316 stainless steel, boroscillicate glass, platinum, (plus O-ring) |
| O-Ring Materials | Viton, Silicone or Ekraz |
| Gas Connection | 1/4” NPT FEMALE GP models, 1/8” NPT FEMALE Ex & GP2 models |
| Ingress Protection | IP66, NEMA 4X |
| Hazardous Area Classification | |
| ATEX | II 2GD Ex d IIB +H2 T6 Gb Ex tb IIIC T85°C Db IP66 |
| IECEx | Ex d IIB +H2 T6 Gb Ex tb IIIC T85°C Db IP66 |
| Temperature Ranges for ATEX and IECEx as per O-ring Type | Silicon: Ta = -40°C to +55°C Viton: Ta = -15°C to +55°C Ekraz: Ta = -10°C to +55°C |
| CCSAUS | Class I, Division 1, Groups B,C,D T6 |
| TC TR Ex-Cert | 1Exd IIB+H2 T6 Gb |
| *Ranges 80–100% up to 99–100% will require a flowing reference and selection of the 4-port model (for H2 and He only) **The typical intrinsic error and response time will be as above. Certain gas combinations and/or ranges may have different specifications. Please consult Michell Instruments for specific cases. For example, CO2 / N2 would be < 50 seconds for T90. Note: If the 4-port version is selected then a reference gas with a flow rate of 300ml/min is required | |
