Data sheet

WATCHDOG

  • Display reads oxygen from 0.05ppm up to 25.0% with no range changes

  • Analog output can be configured to operate over any of ten ranges from 0-10ppm to 0-25% for best resolution

  • Field selectable analog output - 1-5V or 4-20mA, isolated.

  • Complete sample system built in to AMI’s patented cell block.

  • Very rapid response time from air to low ppm levels.

  • Easily replaceable sensor, no tools required.

  • T-2 sensor resistant to 10ppm H2S standard. Optional T-4 resistant to 500ppm H2S.

  • Simple, versatile installation.

  • Operates off 10-28VDC with very low power consumption

  • Analog output can be easily calibrated to a SCADA system or flow computer.

  • USB connectivity to a PC: Allows complete access to the internal functions and settings.

  • ModBus: Industry standard protocol over RS485.

  • Oxygen Sensor life indication with calibration history.

  • 10 user selectable output ranges to choose from.*

  • High resolution 3 digit LCD.

  • RFI protected.

  • 1-5VDC and 4-20mA. isolated analog output signals.

  • USB virtual comport and Modbus Bidirectional RS485 communication for advanced features.*

  • Datalog – 10 days oxygen reading recording at 1 minute per sample*

  • Calibration history – stores the last five calibrations with time, date, span factor and calibration gas.*

  • Brown-out history – stores the last five brown-outs and recoveries.*

  • Power up history – stores the last ten times the unit was powered up.*

  • Advanced analog output calibration.* 
    (* Requires User Interface Software)

  • Power requirements: 10-28VDC.

  • Low minimum detection limit.

  • Excellent repeatability.

  • Fast upscale/downscale response times.

  • Patented Cellblock Technology: Integrates all components such as: flow control valve, flow meter, 3-way calibration valve, Sample/Span/Off and compression fittings to be an integral part of the cellblock, eliminating tubing and fittings.

  • The cell block also provides a compact size, fast response time and front panel sensor access without the need for tools.

  • Area Classification: Designed to meet requirements for Class 1, Div. 2, Groups C,D application.

  • Unaffected by changes in flow rate from 0.1 to 2.0 SCFH

  • Wall mount or 2.0” pipe with standard pipe clamp.

  • Compact size.

  • 2 year warranty for analyzer, parts and labor.

  • 6 month sensor warranty, life expectancy 1-2 years.

  • 10 user selectable output ranges to choose from: 0-10ppm, 0-50ppm, 0-100ppm, 0-500ppm, 0-1000ppm,0-.500%, 0-1%, 0-5%, 0-10% and 0-25%. The selection of an output range simultaneously controls the datalog so that both functions operate on the same range

  • Digital display: 3 digit LCD. Reads full scale from 0.05ppm to 25.0% independently of output range selection

  • Isolated analog output signal: 1-5VDC or 4-20mA represents the output range selected

  • Power requirements: 10-28VDC <50mA. @ 12VDC

  • Minimum detection: 50ppb of oxygen

  • Repeatability: +/- 1% of range or +/- 0.2ppm of oxygen, whichever is greater

  • Operating temperature range: 25 to 115˚ F

  • Diurnal temperature specification: < +/- 3 % of scale over temperature range

  • 90% upscale response times: 10ppm – 25% <10 seconds; 0-10ppm < 25 seconds

  • Typical downscale response: 1 minute exposure to air down to 10ppm: < 15 minutes

  • Area Classification: Designed to meet requirements for Class 1, Div. 2, Groups C,D applications

  • Inlet gas pressure: 0.5 to 150psig

  • Gas connections: ¼” 316 S.S. compression fittings.

  • Wetted parts: 316 S.S. fittings, electroless nickel plated cellblock, gold plated contacts, acrylic flow meter and Viton O-rings

  • Unaffected by changes in flow rate from 0.1 to 2.0 SCFH

  • Mounting: Wall mount or 2.0” pipe

  • Dimensions: 7.0”W x 6.5”H x 4.5”D

  • Weight: 6 lbs.