- Brand: Michell Instruments
Tags: Pura, Pure, Gas, Dew-Point, Transmitter, On-Line, Michell, Instruments
Pura is a small, rugged, self-contained hygrometer transmitter designed
specifically for the measurement of trace moisture content in ultra high
purity gases used for semiconductor manufacturing, fiber optic
production, optical ciating processes and pure gas production
Simple to use and install, Pura is available in 2-wire, 3-wire and
hazardous area versions with VCR process connections and optional
display/alarm units. It is fully configurable to meet specific needs.
Product Features
- Measurement range down to -120°Cdp (-184°Fdp) (1ppbV)
- Stable and repeatable measurement
- Analog and digital output
- Simple installation
- VCR process connections
- Optional display / alarm unit
- Compact design
- Fast response
- Optional Hazardous Area Approval
- Service exchange program
Technical Specification
| Sensor | | |
| Sensor Type | Michell Advanced Ceramic Moisture Sensor | |
| Range | -120 to -40°Cdp (calibrated from -100 to -40°C) (-184°F to -40°Fdp calibrated from -148 to -40°F) | |
| Accuracy | ±1°C from -40 up to -60°Cdp (-40 up to -76°Fdp) ±2°C from -60 up to -100°Cdp (-76 up to -148°Fdp) ±4°C from -100 to -120°Cdp (estimated) (-76 up to -148°Fdp) | |
| Operating Pressure | Minimum 10-7 Pa (10-9 torr) Maximum 24 MPa (240 barg) | |
| Operating Temperature | -40 to +60°C (-40 to +140°F) | |
| Flow Rate | 1 to 5 Nl/min (2.11 to 10.59 scfh) | |
| Electronics/Electrical | | |
| Power | Nominal 24 V DC, 10-28 V DC maximum current 25 mA 2 or 3-wire configuration | |
| Output | PUR-TX-2W: 4 to 20mA 2-wire PUR-TX-3W: 4 to 20mA 3-wire PUR-AOL-SEN only: Digital String (RS485) | |
| Cable with Display | PUR-OL & PUR-IS-OL: 2m (standard) (6.56ft) / 5 or 10m (16.4 or 32.8ft) (optional) PUR-AOL: 2m (standard) (6.56ft) / 5 or 10m (16.4 or 32.8ft) (optional) | |
| Mechanical | | |
| Sensor Block | Premium and OEM version: Cold drawn stainless steel, 0.1 - 0.2 Ra µm electro-polished internal finish | |
| Pressure Connections | Premium and OEM version: ¼" male VCR connection Pura Sensor version: ½" male VCR connection | |
| Installation Profile | Premium and OEM version: 120mm (4.72in) pitch, drop in across gas port face seals Zero pipe clearance required 2 off M4 x 0.7, 7mm (0.03, 0.28in) deep mounting holes in block, diagonally opposed at 20 x 20mm (0.79 x 0.79in) pitch Pura Sensor version: fits into user's ½" VCR configured port | |
| Overall Dimensions | Premium and OEM version: 120 x 35 x 150mm (4.72 x 1.38 x 5.9in) (w x d x h) Pura Sensor version: 132 x Ø35mm (5.2 x Ø1.38in) | |
| Weight | Premium and OEM versions: 450g (0.99lb) Pura Sensor version: 180g (0.4lb) | |
| Packaging | Pura Premium: Double bagged and sealed in UHP inert gas Pura OEM & Pura Sensor: Single bagged in 1000 gauge polythene All options: shipped individually in profiled sponge protection and carton Pura Sensor version supplied with protective guard over sensor surface for transportation and handling | |
| Service Exchange | Available on the Pura Sensor (SEN) ½" VCR connection | |
| Monitors | Advanced Online Monitor: PUR-AOL | Online Monitor: PUR-OL |
| Measurement Units | °F, °Cdp; ppmV and ppbV with user-selectable range and resolution | Simple display defined by 2-wire sensor input |
| Secondary measurement variable | Pressure via external transducer 0-30 MPa (300 variable barg/4351 psi) Completely user-configurable for any industry standard transducer Automatic compensation for ppmV and ppbV | ppmV with no line pressure correction input available with PUR-TX-2W & PUR-IS-2W |
| Power Supply | Universal 85 to 265 V AC; 95 to 370 V DC | 100 to 240 V AC (+10, -15%) 50/60 Hz |
| Ingress Protection | IP54 (NEMA 12); IP66 (NEMA 4X) for front panel only with optional cover | IP65 front panel (IP20 rear panel) |
| Operating Temperature | 0 to +50°C (+32 to +122°F) | 0 to +50°C (+32 to +122°F) |
| Relays | 2 off 10 A / 240 V c/o fully user-configurable: can accommodate full range for selected engineering unit + sensor fault alarm functions | Alarm 1 relay: single pole make contact, rating 3 A @ 250 V AC Alarm 2 relay: changeover contacts, rating 5 A @ 250 V AC |
| Display Resolution | 5 Digit | 4 Digit |
| Outputs: Analog | 4-20 mA fully user-configurable and scaleable for range | 0-20 or 4-20 mA fully user-configurable and scaleable for range |
| Outputs: Digital | RS232: provides 2-way communication - full data access to user and total availability of all set-up options | RS232: provides 2-way communication - full data access to user and total availability of all set-up options |
| Options | | |
| Power Supply | 18 to 36 V AC; 9 to 60 V DC | 24 V DC |
| Relays | 1 or 2 further 5 A relays (max 4 in total) n/o type fully user-configurable: can accommodate full range + full unit choice + sensor fault alarm functions | 1 further optional relay - refer to factory |
| Outputs: Analog | 0-10 V fully user-configurable and scaleable for range | 0 to 10 V output using 500 Ω shunt resistant |
| Outputs: Digital | RS485 | |
