CAI 700 CLD Series User manual

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CAI 700

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Table of Contents
Introduction ...........................................................................................................................5
Analyzer Specifications........................................................................................................8
Installation ...........................................................................................................................10
Safety Information ............................................................................................................10
Startup and Shutdown ..........................................................................................................19
Using the Keypad..................................................................................................................21
Menu Flow Chart..................................................................................................................23
Main Menu...........................................................................................................................31
Measure Screen.................................................................................................................32
Measure Mode...................................................................................................................35
NO Mode................................................................................................................................. 36
NOxMode ............................................................................................................................... 36
NO/NOx/NO2Mode ................................................................................................................ 37
Analyzer Info ....................................................................................................................38
Remote/Manual.................................................................................................................39
Standby.............................................................................................................................40
Menus ..................................................................................................................................41
Calibration........................................................................................................................42
Manual Calibration.................................................................................................................. 43
NO or NOxMode ................................................................................................................. 44
Zero................................................................................................................................... 45
Span................................................................................................................................... 48
NO/NOx/NO2Mode ............................................................................................................. 50
Automated Calibration............................................................................................................ 51
Initiate Sequenced Cal.......................................................................................................... 53
Initiate Sequenced Check..................................................................................................... 55
Cal Gas Concentrations........................................................................................................... 56
Calibration Setup..................................................................................................................... 57
Auto Calibration Schedule................................................................................................... 58
Auto Calibration Parameters................................................................................................ 60
Calibration Via Pump/Valves .............................................................................................. 62
Auto Calibration/Check ....................................................................................................... 63
Auto Calibration Timing...................................................................................................... 64
Deviation Limits................................................................................................................... 66
Maximum Calibration Error.............................................................................................. 67
Maximum Verifying Error................................................................................................ 68
Analog Hold on Cal ............................................................................................................. 69
Calibration Factors.................................................................................................................. 70
Manual Deviations............................................................................................................... 71
Zero Gas Deviations.......................................................................................................... 72
Span Gas Deviations ......................................................................................................... 73
Auto Cal Deviations............................................................................................................. 74
Verifying Zero Deviations ................................................................................................ 75
Verifying Span Deviations................................................................................................ 76
Offset/Gain Factors.............................................................................................................. 77
Reset Factory Settings.......................................................................................................... 78

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Range Setup......................................................................................................................81
Range Limits........................................................................................................................... 82
Auto Range On/Off................................................................................................................. 84
AutoRange Switch Points ....................................................................................................... 85
Diagnostics........................................................................................................................86
Diagnostic Values ................................................................................................................... 87
Raw Values Display................................................................................................................ 89
I/O Status................................................................................................................................. 91
Analyzer Digital Outputs ..................................................................................................... 92
Analyzer Digital Inputs........................................................................................................ 93
Programmable Digital Outputs............................................................................................. 94
Status Line............................................................................................................................... 95
Setup Menu.......................................................................................................................96
Measure Settings..................................................................................................................... 97
Averaging Time ......................................................................................................................... 98
NO/NOx/NO2Mode Times ........................................................................................................ 99
NOx Correction Factors........................................................................................................... 100
Output Settings...................................................................................................................... 102
Programmable Analogs...................................................................................................... 103
Output Assignments........................................................................................................ 104
Output Scaling................................................................................................................. 106
Output Adjustments ........................................................................................................ 108
Programmable Digitals....................................................................................................... 110
Output Assignments........................................................................................................ 111
Output Hold/Clear........................................................................................................... 114
Output Test...................................................................................................................... 115
TCP/IP Parameters................................................................................................................ 117
Data Logging Time............................................................................................................... 118
Auto Start Settings ................................................................................................................ 119
Clock Settings ....................................................................................................................... 121
Alarms Menu ..................................................................................................................122
Current Alarms...................................................................................................................... 123
Alarm Log............................................................................................................................. 124
Alarm Limits......................................................................................................................... 126
Temperatures...................................................................................................................... 127
Pressures............................................................................................................................. 128
EPC Voltages..................................................................................................................... 129
Concentrations.................................................................................................................... 130
Alarm Display On/Off........................................................................................................... 131
Service Menu ..................................................................................................................132
Linear Coefficients................................................................................................................ 133
Factory Service...................................................................................................................... 135
Security...........................................................................................................................136
Operator Levels..................................................................................................................... 137
Change Password.................................................................................................................. 138
Reset Password...................................................................................................................... 139
Communication and Interface .............................................................................................140
Analog and Digital Interface............................................................................................141
Serial Interface................................................................................................................145
AK Protocol ....................................................................................................................146

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Instruction Command............................................................................................................ 148
Error Handling ...................................................................................................................... 150
General AK Requirements.................................................................................................... 151
Scan Commands.................................................................................................................... 153
Control Commands ............................................................................................................... 164
Configuration Commands..................................................................................................... 168
Modbus Protocol.............................................................................................................174
MBAP Description................................................................................................................ 174
MBAP Header Description ................................................................................................... 175
Modbus Command Function Codes...................................................................................... 176
Modbus Map ......................................................................................................................... 193
01H Single-Read Coil ........................................................................................................ 193
05H Write Single Coil........................................................................................................ 195
03H Read Floating Point.................................................................................................... 196
16H Write Floating Point................................................................................................... 199
Warranty Statement ...........................................................................................................201

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Introduction
Thank you for purchasing the CAI 700 CLD NOx/O2Analyzer. Before using the
analyzer, please familiarize yourself with its operation by reading this manual. If you
have any questions, do not hesitate to call California Analytical Instruments Technical
Support for assistance. We want you to be among our thousands of satisfied customers.
Description
The CAI 700 CLD Analyzer is an exceptionally accurate chemiluminescent (CLD) gas
analyzer designed for measuring oxides of nitrogen in gas samples. It also includes a
paramagnetic oxygen channel.
Features
Measurements from 0 to 3,000 ppm Full scale NO/NO2/NOx
Automatic calibration and ranging
Fast response time
Electronic control of sample and ozone flow
Selectable output options of current or 1, 5 or 10 VDC
Communication via RS-232, AK protocol TCP/IP and Modbus TCP/IP
CE Mark and ETL listed to UL STD 61010-1; certified to CAN/CSA C22.2 STD
61010.1
1065-compliant configurations

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Operating Principle
The California Analytical Instruments CLD Analyzer utilizes the principle of
chemiluminescence for analyzing the NO, NOxor NO2concentration within a gaseous
sample. It uses paramagnetic technology for measurement of oxygen.
In the NO mode, the measurement is based upon the chemiluminescent reaction between
ozone and nitric oxide (NO) yielding nitrogen dioxide (NO2) and oxygen. This reaction
produces light which has intensity proportional to the mass flow rate of NO2into the
reaction chamber. The light is measured by means of a photodiode and associated
amplification electronics.
In the NOxmode, NO plus NO2 is determined as above; however, the sample is first
routed through the internal NO2 to NO converter which converts the NO2in the sample to
NO. The resultant reaction is directly proportional to the total concentration of NOx.
Sample enters the analyzer directly into a heated chamber and is maintained at an
elevated temperature. The moisture will remain in the vapor state, ensuring no loss of the
NO2.
Reaction Chamber
The sample and ozone are delivered to the reaction chamber via the unique regulated
flow system described below, and mixed together at the center of the chamber where the
reaction takes place. The sample is vented from the chamber through a ¼-inch tube. The
chamber contains a long-pass filter that is sealed with an integral O ring. The chamber
assembly is mounted to the photodiode.

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Flow System
The flow system’s basic function is to deliver highly regulated flows of sample and air or
O2 to the ozonator and reaction chamber assemblies. The EPC (electronic proportional
control) valve delivers approximately 15 PSIG (Standard without ozone pump option) to
a pre-set capillary and consequently accurately predetermines the ozone flow rate. The air
supply cylinder should be set to 25 PSIG.
Sample flows through the sample EPC valve, the NO/NOxsolenoid valve, the sample
capillary and into the reaction chamber. The sample pressure is factory set to
approximately 3.85 PSIG (Standard without low pressure option). A close-coupled
bypass capillary minimizes dead volume and improves response time. Sample inlet
pressure and regulated air pressures are monitored by internal pressure transducers and
presented in PSIG via the Diagnostics screen.
NOTE: The correct pressures are determined by the factory for optimal analyzer
performance and are recorded on the Factory Settings Screen in the analyzer.

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Analyzer Specifications
Specifications are subject to change without notice.
Detector: Chemiluminescence (CLD) Photodiode (thermally stabilized with Peltier
cooler).
NO/NOxRanges: Four operator-definable ranges from 0-3 to 0-3,000 ppm standard
(consult factory for other ranges).
Paramagnetic O2: Ranges 0-25% and 0-100%.
Response Time: Typically less than < 2 seconds to 60 seconds (adjustable).
Resolution: 10 ppb NO/NOx(displays 5 significant digits).
Repeatability: Better than 0.5% of Full scale.
Linearity: Better than 0.5% of Full scale.
Noise: Less than 1% of Full scale.
Zero and Span Drift: Less than 1% of full scale per 24-hour period.
Zero and Span Adjustment: Via front panel, TCP/IP or RS-232.
NH3, HCN and SO2Effect: Not detectable with 100 ppm.
CO2Effect: Less than 2% with 10% CO2.
H2O Effect: Less than 1% with 1% H2O.
Flow Control: Electronic proportional pressure controller.
Sample Flow Rate: Typically 2.0 LPM (0.6 LPM with low-flow option).
Converter: Vitreous carbon material (> 95% efficiency at 205°C).
Ozonator: Ultraviolet lamp.
Air or O2Requirements: Less than 0.01 ppm NOxand Dew point < -10ºC. (Approx 350
cc/Min at 25 PSIG).
NO/NOxControl: Via front panel; Auto Cycle, Digital input, Modbus or AK Protocol.
Outputs: AK Protocol (TCP/IP and Serial RS-232), Modbus TCP/IP and 4
programmable, scalable analog outputs (voltage or current).
Alarms and Statuses: 15 operator-defined digital contact closures.
Digital Diagnostics: Control voltages, temperatures, pressures and flows.

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Special Features:
Calculated NO2 derived from NOxconverter efficiency
Auto ranging
Auto calibration (adjustable through internal clock)
< 3 cc gold-plated reaction chamber
Display: 3” x 5” backlit LCD.
Sample Temperature: Up to 50°C non-condensing sample.
Ambient Temperature: 5 to 40°C.
Ambient Humidity: Less than 90% RH non-condensing.
Warm-up Time: 1 hour (typical).
Fittings: ¼-inch tube fittings.
Power Requirements: 115 VAC/60 Hz or 230 VAC/50 Hz ±10% (500 Watts max).
Dimensions: 5¼ H x 19 W x 23 D (inches).
Weight: Approximately 45 lbs. depending on options.

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Installation
Safety Information
Safety Alert Temperature Hazard Electrical Shock Hazard
Caution or Warning Caution or Warning Caution or Warning
Note, Caution and Warning symbols appear on the instrument and in this manual to draw
your attention to important operational and safety information.
A “NOTE” marks a short message to alert you to an important detail.
A “CAUTION” safety alert appears with information that is important for protecting
your equipment and its performance.
A “WARNING” safety alert appears with information that is important for protecting
you, other people and equipment from damage. Pay especially close attention to all
warnings that apply to your application.
The symbol (an exclamation point in a triangle) precedes a general CAUTION or
WARNING statement.
The symbol (wavy vertical lines with an underscore in a triangle) precedes an
elevated temperature hazard CAUTION or WARNING statement.