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iGAS Operating Instructions, Issue 6, Apr 2018

NOTES

Please visit

www.iGASES.uk

to access other iGAS and iDUST documentation

If you need assistance, please contact:

Turnkey Instruments Ltd, Dalby Court, Gadbrook Business Centre, Northwich, England CW9 7TN

Tel: +44 (0) 1606 330020 Fax: +44 (0) 1606 331526

Email: [email protected]

Revision History

•

Original, 7 May 2017

•

18 April 2017, issue 6, for iGAS HashCode 64, G1.90mjl

© 2017 Turnkey, MJL, Issue 6, Apr 2018

CE 2017

www.turnkey.tel

Turnkey®, iGAS ® and iDUST® are registered trademarks

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Содержание iGAS

Страница 1: ...L HOURS FOR THE READINGS TO STABILIZE ESPECIALLY CO H2S and SO2 It is recommended that the filters are changed at 3 monthly intervals however filter life may vary depending on local ambient conditions iGAS is supplied with one spare set of filters It good practice to mark the filters with their installation date A Filter Shield is provided with the instrument and this should be fitted when the ins...

Страница 2: ... the Instrument Information table Fault Flag states and Diagnostic Housekeeping Readings Please see Appendix of this document for full lists of the Feature Flags Instrument Settings Fault Flags and Diagnostic readings The electrochemical cells used in iGAS need to be held under a constant bias voltage even when the instrument is not being used With 8 cells connected this draws a current of about 1...

Страница 3: ... 1 to very high 10 to provide detail about air pollution levels in a simple way similar to the sun index or pollen index USA EPA The carbon monoxide CO readings are in ppm parts per million The UK readings are given in µg m3 the USA EPA in ppb parts per billion The conversion between the two is given by the following table iGAS can record results either in ppb or µg m3 see Feature Flags 1 ppb µg m...

Страница 4: ...ochemical cells especially SO2 and H2S iGAS incorporates special sensors to compensate for the effect The Sample Filter is a 1 micron PTFE membrane filter which is used simply to prevent ambient dust particles being drawn into the instrument when sampling A PTFE membrane is used to minimize absorption of sample gases especially ozone Note that most P3 respirator filters absorb ozone and acidic gas...

Страница 5: ...e calculated Continuous Zeroing overrides all other zeroing schemes and is the recommended mode of operation Use to acclimatize a new Zero Filter Periodic Zeroing Measures the sensor offsets at the Zeroing Interval specified in the Instrument Settings If the Zeroing Interval is zero the offsets are just measured at the start of the sample Each offset measurement takes three Zero Phases make sure y...

Страница 6: ...erval can be in the range 1 second to 30 minutes and is independent of the reporting interval The instrument s memory can hold up to 100 samples each consisting of many reports A sample is identified by its Sample Number When the memory is cleared the sample number is reset The total number of samples measured by the instrument over its life is the Sample Total SAMPLE CONTROL FEATURE FLAGS If Auto...

Страница 7: ...AS internal battery capacity is 2000 mAH The battery is intended to keep the instrument operating if the external 12 Volt power disappears Assuming a full charge iGAS will continue to operate without external power for about 10 hours If the battery is discharged a full recharge will take about 12 to 14 hours with the instrument automatically switching on before then when the battery reaches 6 5 Vo...

Страница 8: ...d the battery voltage is 6 5Volts The instrument can also be turned on remotely by sending a 1 second RS485 BREAK command from the WS3 web server in the Power Portal Please refer to your AirQWeb documentation If the Allow to Sleep Feature Flag is set and 1 there is no communications activity 2 the instrument is not measuring a sample the instrument will automatically fall asleep after about 5 minu...

Страница 9: ...mine sensor zero gas offset Overrides Periodic Zero flag Takes two Zero phases to complete 2 minutes by default Periodic Zero Measure sensor zero gas offset at start of sampling and thence at the Zeroing interval specified in the instrument Settings Takes three Zero phases to complete Use Period Zero Apply the zero offset readings determined by the Periodic Zero above Over ridden by the Continuous...

Страница 10: ...ted by default Measures enclosure T too Measure ambient T RH External T RH sensor must be fitted Measure ambient CO2 Measure ambient CO2 sensor must be fitted Measure iDUST sample flow Measure iDUST sample flow sensor must be fitted Measure wind speed direction Requires iMET with anemometer module Measure insolation Requires iMET with solar module fitted measures intensity of sunlight in W m2 Meas...

Страница 11: ...ion aka T90 INSTRUMENT SETTINGS show in bold font in the text These settings control the instrument s reporting and sampling They are normally controlled automatically by AirQWeb Not all of the Instrument Settings are listed below Instrument Setting Explanation Description Sample Total Running count of total number of samples taken by the instrument over its life Never normally reset Sample Number...

Страница 12: ...f samples Sample Stack sets the number of contiguous samples in the buffer Company Company name string up to 16 bytes Location Location name string up to 16 bytes Gas Sensor Mask Mask showing which sensors are fitted in the iGAS manifold Zeroable Mask Mask showing which of those sensors are suitable for continuous or periodic zeroing Manifold hours Hours the gas sensor manifold has been used Diffo...

Страница 13: ... Dead battery Battery voltage 5 5Volts Sampling will have been stopped and cannot re start until battery voltage 5 8 Volts I m too hot The case temperature is 60C Sampling is stopped Fatal Error One of the above faults has occurred sampling is stopped until fault condition clears Memory 90 full Memory is at 90 capacity stop sampling and clear memory Low battery The battery voltage is 5 8 Volts Rec...

Страница 14: ...Turnkey Instruments Ltd Dalby Court Gadbrook Business Centre Northwich England CW9 7TN Tel 44 0 1606 330020 Fax 44 0 1606 331526 Email techsupport turnkey instruments com Revision History Original 7 May 2017 18 April 2017 issue 6 for iGAS HashCode 64 G1 90mjl 2017 Turnkey MJL Issue 6 Apr 2018 CE 2017 www turnkey tel Turnkey iGAS and iDUST are registered trademarks ...

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