418 - Luft detector infra-red (IR) gas analyser
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418 - Luft detector infra-red (IR) gas analyser In addition to reference method gas analysers, Signal Group also manufactures a full range of sample handling, calibration and test instruments; making Signal Group a one-stop-shop for emissions monitoring equipment. Luft, R.F. capacitive bridge circuit detector for highly specific gas detection Advanced optical design allows direct ambient measurement Wide range choice with auto range (ppm to 100%) Temperature controlled for maximum stability Fast response with high accuracy, repeatabilty and low noise Full automatic microprocessor operation with auto start up, calibration with health checks and alarms 4U high 19” rack enclosure, swithable 115/230 V AC 2 year warranty Remote control (RS232) & logic status and control 0-10Vdc and 4-20 mA outputs APPLICATIONS INCLUDE • Toxic Gas Measurement • Specialist Research • Semiconductor Gases SPECIFICATION DETECTOR Dual chamber gas filled variable capacitor utilising RF detection to optimise sensitivity RANGES Dependant on gas , from ppm up to 100% concentration (see separate data sheet for full details). RESPONSE Dependant on gas and settings. Typically less than 15 seconds (5-95%) at 1 l/min flow, with time constant of 2 seconds (see separate data sheet for full details). BYPASS FLOW SENSITIVITY Typically less than +/- 1 % change in reading from 0.2 to 2.0 l/min into ambient pressure exhaust. ACCURACY & REPEATABILITY Better than +/- 1 % of range or +/- 0.2 ppm, whichever is greater. DETECTOR NOISE Gas and range dependant, see separate data sheet. Range time constants can be configured to suit application sample noise. Longer time constants will reduce noise at the expense of response time. LINEARITY Better than +/- 0.5% of range Ambient Temperature Effects Zero : +/- 0.2 % per °C of highest range from 5 °C to 30 °C. Span : Less than +/- 0.2 % of range from 5 °C to 30 °C. Chart recorder output: add +/- 0.02% of range per °C. DRIFT Zero and span drift are less than 1% of range in 1 hour at constant temperature and pressure. DISPLAY 240 x 64 pixel LCD display with switchable back-light shows concentration units and gas in large, clear characters. Vertical bar graph of chart output with alarm markers and sample flow indication. Range, control and message areas. Multi screen operation for full analyser status and configuration. INPUTS Digital control lines are provided for the remote control of Range, Input Port, Sleep (Standby), and Calibration. The inputs are arranged for contact closure to Common Return to represent the TRUE condition. OUTPUTS Non isolated 0 - 10Vdc, isolated 4 - 20 mA analogue outputs of displayed range, Range analogue output is supplied. Digital lines are provided for the remote indication of the analyser status. Range, Input Port, Calibration in Progress, Calibration Failed, High Alarm, and Low Alarm are available. REMOTE CONTROL Serial interface RS232 using AK protocol all functions available. Baud rate from 1200 to 19200. Logic control Full function control vIa digital inputs, status monitor via digital outputs. AUTOCALIBRATION Controlled by microprocessor, RS232 or switched logic. Authorised Representative: Signal Group Ltd Standards House, Doman Road, Camberley, Surrey GU15 3DF United Kingdom Email: sales@signal-group.com SAMPLE CONDITION Gas to be analysed must not exceed 50 oC, with a dew point of 10 oC below local ambient temperature. SAFETY All high voltage/current circuits are shielded within the analyser. DIMENSIONS 19” Rack or bench mount 4U high. 550mm behind mounting face, 45 mm in front of mounting face. SERVICES Sample, span and zero inlets - 1/4” tube fittings, bypass outlet 1/4”. Zero grade N2 for zero calibration and dual cell purge. Span calibration gas. APPROXIMATE WEIGHT 18 Kg POWER Switchable bet