H
2
S in Natural Gas Index–1
INDEX
4-20 mA current loop 2–10, 3–10
Absorption 1–4, 1–5
Absorption coefficient 1–5
Absorption profile 1–5
Absorption spectrometer 1–4
Absorption spectroscopy 1–4
Accessories. See Options.
Acetone A–1, A–2, A–3
Acetone-impenetrable gloves A–2, A–3
Alarms
General Fault Alarm 3–12
High Concentration Alarm 3–12
Applications 1–4
Atmospheric moisture 1–4
Carbon dioxide in natural gas 1–4
Energy content of natural gas 1–4
EPA emissions compliance 1–4
H
2
S in natural gas 1–4
Industrial process control 1–4
Moisture in natural gas 1–4
Moisture in petrochemical plants 1–4
Moisture in refineries 1–4
Attenuation 1–5
Automatic validation 2–14
Average concentration 3–7
Background gas 3–21, 4–1, 4–4
background gas 1–1
Beam path 1–5
Beer-Lambert absorption law 1–5
Bypass loop 4–1
Calibrating the analyzer 3–21
Capturing data from the serial port 3–16
Capturing diagnostic data A–4, A–6, A–7
Cautions 1–2
CH
4
1–4
Cleaning
Gas sampling lines A–1
Mirrors A–2
COM port A–7
COM properties 3–15
Concentration 3–3, 3–5, 3–7, 3–10, 4–1
Conditioning the analyzer tubing 2–16
Connecting the optional purge system
2–15
Connecting the sample inlet line 2–13
Connecting the sample return line 2–14
Connecting the signal cables 2–10
Connecting the validation source 2–14
Contamination 1–5, 3–21, A–1
Current loop 2–10, 3–7
Calibrating 3–10
Receiver 2–12
Current loop receiver 3–12
Current tuning 1–5
Data 1–5
Diagnostic 3–9, 3–10, 3–18
Normalized 2f 1–7
Normalized absorption 1–7
Raw 1–5
Data string 3–15
De-energizing the circuit 2–12
Detection levels 1–6
Detector 1–4, 1–5
Differential switching 1–4
Diode laser absorption spectrometer 1–4
Electrical noise A–1, A–3
Electronic Power Control Unit (EPCU) 2–8
Encapsulated Intrinsic Safety Module's
(EISM) 2–8
Enclosure 2–4
Explosion-proof 2–4
Heated 2–6, 3–2
Enclosure purge 2–15
Energizing the circuit 3–1, 3–11, 3–12
Erroneous readings 2–16
Excessive sampling gas pressure A–1,
A–3, A–4
Excessive sampling gas temperature
A–1, A–3, A–4
External data logger 3–7
Faults
Fitting out of Limit 3–12
Laser Power too High 3–13
Laser Power too Low A–4, A–1,
3–12, A–2
Pressure too High A–5, 3–13,
A–3, 3–11
Pressure too Low A–3, 3–13, A–5
Temperature too High 3–13,
A–3, A–5
Temperature too Low A–5, A–3,
3–13
Flow schematic 4–1, 4–3, B–3, B–4
Flowmeter 4–1
Gas leaks 2–14, 2–15, 2–16, A–1
Gas lines 2–12
Gas sampling line A–1, A–2
Gas standard 3–20, 4–4
Ground connection for serial cables 2–11
Ground wire 2–5, 2–8