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ATI

Q46H/65 Residual Chlorine Dioxide System

Part 4

– Electrical Installation

28

O&M Manual
Rev-J (11/18)

QUA

NTUM

Figure 20 - Junction Box Wiring w/Optional pH Comp.

Note

: The

BLUE

wire is

NOT

used when connecting a Flow

Style Probe to the analyzer

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Summary of Contents for Q46H/65

Page 1: ...nology Inc ATI UK Limited 6 Iron Bridge Drive Unit 1 2 Gatehead Business Park Collegeville PA 19426 Delph New Road Delph Phone 800 959 0299 Saddleworth OL3 5DE 610 917 0991 Phone 44 0 1457 873 318 Fax 610 917 0992 Fax 44 0 1457 874 468 Email sales analyticaltechnology com Email sales atiuk com ...

Page 2: ...OFTWARE NAVIGATION 34 6 22 MEASURE MENU MEASURE 36 6 23 CALIBRATION MENU CAL 37 6 24 CONFIGURATION MENU CONFIG 37 6 25 CONTROL MENU CONTROL 42 6 26 DIAGNOSTICS MENU DIAG 45 PART 7 CALIBRATION 49 7 1 CHLORINE DIOXIDE CALIBRATION 49 7 11 CLO2 ZERO CAL 49 7 12 CLO2 SPAN CAL 50 7 2 TEMPERATURE CALIBRATION 51 7 3 PH CALIBRATION 52 7 31TWO POINT PH CAL 52 7 32 ONE POINT PH CAL 53 PART 8 PID CONTROLLER D...

Page 3: ...LL DETAILS 19 FIGURE 13 LINE POWER CONNECTIONS 21 FIGURE 14 OPTIONAL RELAY BOARD WIRING 22 FIGURE 15 OPTIONAL RELAY BOARD WIRING 23 FIGURE 16 OPTIONAL ANALOG OUTPUT WIRING 23 FIGURE 17 SENSOR CABLE PREPARATION 24 FIGURE 18 DIRECT SENSOR CONNECTION 25 FIGURE 19 JUNCTION BOX INTERCONNECT WIRING 26 FIGURE 20 JUNCTION BOX WIRING W OPTIONAL PH COMP 28 FIGURE 21 CLO2 SENSOR ASSEMBLY 29 FIGURE 22 USER IN...

Page 4: ...ssembly The chlorine dioxide measurement does not alter the sample or add any chemicals to the sample stream so the water flow can return to the system if desired Q46H 65 Monitors are available in two basic electronic versions a 90 260VAC powered monitor or a 12 24VDC powered monitor both with three relays and two 4 20 mA analog outputs Both versions allow flexible output options which include an ...

Page 5: ...onnection of the sensor to the electronics a 25 foot cable is supplied An additional 100 feet of interconnect cable may be added using 07 0100 junction box All required spare parts are also provided with the basic system including spare membranes electrolyte o rings and any special hardware Note that standard 25 foot sensor cables for both ClO2 and optional pH sensors can be cut to a shorter lengt...

Page 6: ... 18 Figure 2 below shows the same standard flowcell assembly and ClO2 sensor along with the conventional type pH sensor A special adapter is required to hold the pH sensor in its proper location in the flowcell inlet chamber Figure 2 Chlorine Dioxide System w Conventional pH Style Sensor ...

Page 7: ...mmend the use of our 03 0372 flow control assembly when using sealed flowcells This assembly consists of an in line filter and a fixed flow regulator which will maintain a constant 400 cc min flow rate through the system This flow will be maintained so long as inlet pressures are between 5 and 125 PSIG The in line filter is used mainly to protect the flow control element against larger particles t...

Page 8: ...nostic stuck controller timer feature for alarm output of control problems Digital communication option for Profibus DP and Modbus RTU Ethernet IP is pending Two analog outputs may be configured to track ClO2 and temperature ClO2 and ClO2 or ClO2 and pH Both analog outputs can be individually programmed to fail to specific values An optional third analog output is available providing separate outp...

Page 9: ...bility in the dark Keypad 4 key membrane type with tactile feedback polycarbonate with UV coating System Weight Approximately 5 lbs 2 3 Kg with sensor flowcell Ambient Temperature Analyzer Service 20 to 60 C 4 to 140 ºF Sensor Service 5 to 55 C 23 to 131 F Storage 5 to 70 C 22 to 158 ºF Ambient Humidity 0 to 95 indoor outdoor use non condensing to rated ambient temperature range Altitude Maximum 2...

Page 10: ... enclosure Gland seals provided but not installed Relays Electromechanical Three SPDT 6 amp 250 VAC 5 amp 24 VDC contacts Software selection for setpoint phase delay deadband hi lo alarm and failsafe A B indicators on main LCD and C indicator on lower display Optional Relays Three additional non isolated low power relays available SPST 1 Amp 30 VDC Analog Outputs Two 4 20 mA outputs Output one pro...

Page 11: ...duction 11 O M Manual Rev J 11 18 Equipment bearing this marking may not be discarded by traditional methods in the European community after August 12 2005 per EU Directive 2002 96 EC End users must return old equipment to the manufacturer for proper disposal ...

Page 12: ... process To take full advantage of the high contrast display mount the instrument in a location where the display can be viewed from various angles and long distances Locate the instrument in close proximity to the point of sensor installation this will allow easy access during calibration The sensor to instrument distance should not exceed 100 feet To maximize signal to noise ratio however work w...

Page 13: ...nt is then attached to the wall Figure 6 using the four outer mounting holes in the bracket These holes are slotted to accommodate two sizes of u bolt that may be used to pipe mount the unit Figure 7 Slots will accommodate u bolts designed for 1 or 2 pipe The actual center to center dimensions for the u bolts are shown in the drawing Note that these slots are for u bolts with 20 threads The 1 pipe...

Page 14: ...ATI Q46H 65 Residual Chlorine Dioxide System Part 2 Analyzer Mounting 14 O M Manual Rev J 11 18 Figure 6 Wall Mounting Diagram Figure 7 Pipe Mounting Diagram ...

Page 15: ... to the rear of the enclosure 4 screws for attachment of this bracket and a sealing gasket to insure that the panel mounted monitor provides a water tight seal when mounted to a panel The sealing gasket must first be attached to the enclosure The gasket contains an adhesive on one side so that it remains in place on the enclosure Remove the protective paper from the adhesive side of the gasket and...

Page 16: ...ring low concentrations below 0 5 PPM this method should always be used Mechanical installation of the flow cell requires that it be mounted to a wall or other convenient flat surface Alternatively the mounting holes on the plate will accommodate a 2 U bolt for mounting the plate to a 2 pipe Figure 9 shows the dimensions and mounting hole locations for the flow cell Be sure to allow enough clearan...

Page 17: ... use with flexible tubing The inlet hose barb is used with I D tubing and the drain hose barb is used with I D tubing 3 3 Low Volume Flowcell Dissolved ClO2 sensors can sometimes be used in special low volume flow cells to reduce the amount of water consumed by the monitor This flow cell contains hose barbs for I D tubing on the inlet and outlet The female thread in the flow cell is 1 8 NPT and ot...

Page 18: ... the bottom and the outlet at the top With flow always moving upward air will be swept out of the cell and will not accumulate Figure 10 shows mounting of the low volume flow cell using the optional clamp assembly 3 4 Sealed Flowcell Applications where the sample inlet flow is well controlled can use a simpler sealed flowcell Using this flowcell requires that flow be controlled externally to about...

Page 19: ...ATI Q46H 6 Residual Chlorine Dioxide System Part 3 Sensor Flowcell Mounting 19 O M Manual Rev J 11 18 Figure 12 Sealed pH Flowcell Details ...

Page 20: ...the instrumentation signals 3 This analyzer must be installed by specifically trained personnel in accordance with relevant local codes and instructions contained in this operating manual Observe the analyzer s technical specifications and input ratings Proper electrical disconnection means must be provided prior to the electrical power connected to this instrument such as a circuit breaker rated ...

Page 21: ...ted from each other to insure that ground loops do not result from the connection of both outputs to the same device such as a PLC or DCS A ribbon cable connects the power supply assembly with the microprocessor assembly located in the front section of the enclosure This cable may be unplugged from the front section of the monitor if service is needed but should normally be left in place during in...

Page 22: ...pply board None of the relay contacts are powered The user must supply the proper power to the contacts For applications that require the same switched operating voltage as the Q46 115 or 230 V power may be jumpered from the power input terminals at TB7 Relay wiring is connected at TB4 TB5 and TB6 as shown below Note that the relay contact markings are shown in the NORMAL mode Programming a relay ...

Page 23: ...used to connect to the optional 3 relay card Figures 15 OR the optional third analog outputOut 3 Figure 16 The Q46 can be configured for only one of these optional features and the hardware for either option must be factory installed Figure 15 Optional Relay Board Wiring Figure 16 Optional Analog Output Wiring ...

Page 24: ...d and removed easily from the flowcell Cord grips used for sealing the cable should be snugly tightened after electrical connections have been made to prevent moisture incursion When stripping cables leave adequate length for connections in the analyzer enclosure as shown below The standard 25 ft sensor cable normally supplied with the system is already stripped and ready for wiring This cable can...

Page 25: ...ble away from AC power lines adjustable frequency drives motors or other noisy electrical signal lines Do not run sensor or signal cables in conduit that contains AC power lines or motor leads Note If sensor is experiencing Low Slope or Low Output conditions due to poor Earth Ground Connections move the Shield connection from P S board to alternate location on lid where indicated with an S Figure ...

Page 26: ...unction box The junction box is shown in and is supplied with two cable glands on the bottom of the enclosure Note If sensor is experiencing Low Slope or Low Output conditions due to poor Earth Ground Connections move the Shield connection from P S board to alternate location on lid where indicated with an S Figure 19 Junction Box Interconnect Wiring Note The BLUE wire is NOT used when connecting ...

Page 27: ...vailable for connection to the Q46H 62 monitor A battery powered sensor with internal preamp 07 0096 provides an amplified signal of 0 3 1 5 VDC A standard pH sensor without preamp 63 0101 is also available but the maximum cable length for this sensor is 25 ft 7 5 m When this sensor is used with the constant head flowcell an adapter is supplied to allow the sensor to sit in the inlet chamber If pH...

Page 28: ...l Chlorine Dioxide System Part 4 Electrical Installation 28 O M Manual Rev J 11 18 QUANTUM Figure 20 Junction Box Wiring w Optional pH Comp Note The BLUE wire is NOT used when connecting a Flow Style Probe to the analyzer ...

Page 29: ...yte chamber from the assembled sensor and also remove the vent screw from the side of the sensor body 2 Remove the front nut from the bottom of the chamber and discard the protective membrane O rings are contained in grooves on both the bottom and top of the chamber Be sure that these o rings remain in place 3 From the package of membranes supplied with the sensor place a new membrane into the fro...

Page 30: ...or other misuse may cause permanent damage to the sensor 5 2 Optional pH Sensors As mentioned previously two optional pH sensors are available for use with the Q46H system one battery powered and one without an internal preamp The pH sensors may be used for continuous monitoring of both chlorine dioxide and pH Both sensors are shipped with a protective rubber boot containing a small amount of salt...

Page 31: ...ed from this user interface no internal jumpers pots etc Figure 22 User Interface MENU ICONS UNITS 12 CHARACTER SECONDARY DISPLAY MEMBRANE KEYPAD MENU ESC ENTER A B DIAG FAIL HOLD CAL CONF MENU ICONS UNITS 12 CHARACTER SECONDARY DISPLAY MEMBRANE KEYPAD ENTER KEY LEFT ARROW KEY 4 DIGIT MAIN DISPLAY MENU ESCAPE KEY UP ARROW KEY SIGN RELAY LO BAT INDICATOR 4 KEY USER INTERFACE RELAY INDICATOR ...

Page 32: ... list item for change and to store any change 6 12 Display The large custom display provides clear information for general measurement use and user configuration There are three main areas of the display the main parameter display the secondary message line and the icon area Main Parameter During normal operation the main parameter display indicates the present process input with sign and units Th...

Page 33: ...se the output is locked to the last input value measured when the HOLD function was entered HOLD values are retained even if the unit power is cycled FAIL The FAIL icon indicates that the system diagnostic function has detected a problem that requires immediate attention This icon is automatically cleared once the problem has been resolved Relay Area A B The relay area contains two icons that indi...

Page 34: ... been completed pressing ENTER again stores the variable and stops the flashing Pressing ESC aborts the change and also exits user entry mode The starting default screen is always the Measure Menu The UP arrow key is used to select the desired display From anywhere in this section the user can press the MENU key to select one of the four Menu Sections The UP arrow icon next to all list items on th...

Page 35: ...t 3 Mode Relay C Mode 5 Relay E Mode 5 Relay D Mode 5 Relay F Mode 7 Com Mode 7 Com Address 4 Set 4mA 3 4 Set 20mA 3 6 Setpnt A or A HI A LO 6 Hyst A or A HI A LO 6 Delay A or A HI A LO Phase A Setpnt B Hyst B Delay B Phase B Setpnt C Hyst C Delay C Phase C 5 Setpnt D 5 Hyst D 5 Delay D 5 Phase D 5 Setpnt E 5 Hyst E 5 Delay E 5 Phase E 5 Setpnt F 5 Hyst F 5 D elay F 5 Phase F 4 Fail Out 3 4 Fail V...

Page 36: ...yzer current on the right The controller can be placed in manual while viewing this screen by pressing and holding the ENTER key for 5 seconds until a small flashing m appears on the screen At that point the controller output can be adjusted up or down using the UP and LEFT arrow keys To return to automatic operation press and hold the ENTER key for 5 seconds and the M will disappear 14 00 mA Anal...

Page 37: ...cy However long cable lengths and junction boxes may degrade the accuracy of the temperature measurement in some extreme situations Therefore this feature is provided as an adjustment See Part 7 Calibration for more details Set Range This function allows the user to set the display range of the analyzer to a specific application Once set all output functions use this display range to establish con...

Page 38: ...nd store the new value Main Units This function allows the user to select either PPM or mg l for the ClO2 measurement Zero Filter This function forces the reading to zero when reading is below the entered value For example If the entered value were 0 0020 the display at 0 0019 would then indicate 0 0000 This feature is useful in blanking out zero noise Main Display This function allows the user to...

Page 39: ... normal control operation for Relay A with settings for setpoint hysteresis delay and phasing appearing in the CONFIG menu automatically See Figure 25 for further details The FAIL setting enables the fail alarm mode for Relay A Relay A will then trip on any condition that causes the FAIL icon to be displayed on the LCD Using this mode allows the User to send alarm indications to other remote devic...

Page 40: ...tiate user entry mode Use the UP arrow key to modify the desired display value The choices are OFF and ON Press ENTER to store the new value pH Type Allows the user to select either 1 Comb or 2 Q22P The 1 Comb selection configures the monitor for a standard pH electrode without using its temperature compensation but in turn uses the temperature compensator from the ClO2 sensor The 2 Q22P selection...

Page 41: ...9 75 95 4 24 95 7 01 95 9 77 4 00 pH 7 00 pH 9 18 pH ºC pH C pH C pH 0 4 00 0 7 10 0 9 46 10 3 99 10 7 06 10 9 33 20 4 00 20 7 02 20 9 23 30 4 01 30 6 99 30 9 14 40 4 03 40 6 97 40 9 07 50 4 05 50 6 98 50 9 01 60 4 08 60 6 98 60 8 96 70 4 12 70 6 97 70 8 92 80 4 16 80 6 99 80 8 89 90 4 21 90 7 01 90 8 85 95 4 24 95 7 01 95 8 83 4 65 pH 6 79 pH 9 23 pH ºC pH C pH C pH 0 4 67 0 6 89 0 9 48 10 4 66 1...

Page 42: ...t the desired numerical value Press ENTER to store the new value PID Setpnt The measured value which the controller is attempting to maintain by Iout1 PID adjusting output value It is the nature of the PID controller that it never actually gets to the exact value and stops The controller is continually making smaller and smaller adjustments as the measured value gets near the setpoint PID Prop Pro...

Page 43: ...ts in this section the default settings for this output will be stored present data is not converted Set 4 mA 3 OPTIONAL These functions set the optional third 4 mA and 20 mA Set 20 mA 3 current loop output points for the analyzer The output may be set to temp ClO2 pH track temperature default pH or ClO2 The values stored for the 4 mA point may be higher or lower than the value stored for the 20 m...

Page 44: ...ify the desired value selections include HI for direct operation or LO for reverse operation Press ENTER to store the new value See Figure 25 below for a visual description of a typical control relay application If Relay A Mode is set to Alarm Mode AL then the following settings will appear in the Config Menu list automatically In this mode two setpoints can be selected on the same relay to create...

Page 45: ...nction locks the current loop output values on the present process value and halts operation of the PID controller This function can be used prior to calibration or when removing the sensor from the process to hold the output in a known state Once HOLD is released the outputs return to their normal state of following the process input Setpoint A HI 1 000 ppm Setpoint A LO 500 ppm Hyst A HI 1 050 H...

Page 46: ...s due to the high number of internal tests occurring As faults are corrected they are immediately cleared Faults are not stored therefore they are immediately removed if power is cycled If the problem causing the faults still exists however faults will be displayed again after power is re applied and a period of time elapses during which the diagnostic system re detects them The exception to this ...

Page 47: ...e forced to the current value set in Fail Val next item With the Fail Out setting of ON and a Fail Val setting of 6 5 mA any alarm condition will cause the current loop output to drop outside the normal operating range to exactly 6 5 mA indicating a system failure that requires attention Press ENTER to initiate user entry mode and the entire value will flash Use the UP arrow key to modify desired ...

Page 48: ...addition a power fail would also cause the contacts to open Start Delay This function is designed to minimize control or alarm issues arising from temporary power loss When power goes down the monitor records the analog output values and the status of relays and PID functions When power is restored the analog values and relays will be held at the pre power loss values for a defined period of time ...

Page 49: ...y plugging the cable plug into the receptacle on the top of the sensor 2 Place about an inch of water in a small beaker or other convenient container and immerse the tip of the sensor The water used need not be distilled but it must not contain chlorine dioxide For submersible sensors submerge the entire sensor in a bucket of non ozonated water Allow the sensor to sit undisturbed for at least 15 3...

Page 50: ...othly into place If insertion becomes difficult use a small amount of silicon grease to lubricate the o rings If the low volume flow cell is used screw the sensor into the flow cell until the membrane cap bottoms out on the acrylic flow cell Do not over tighten 2 Turn on the inlet water flow to the flow cell and adjust the inlet flow rate so that water is overflowing from the inlet chamber The bes...

Page 51: ... placed into a known solution temperature reference In any case it is critical that the sensor be allowed to reach temperature equilibrium with the solution in order to provide the highest accuracy When moving the sensor between widely different temperature conditions it may be necessary to allow the sensor to stabilize as much as one hour before the calibration sequence is initiated If the sensor...

Page 52: ...ntial which can vary with the flow rate of the process The magnitude of this potential can be upwards of 30 mV half a pH unit The lower the conductivity of the water the larger the effect It is not possible to eliminate this effect however it usually is constant or very slow changing A full calibration of the pH sensor consists of an initial 2 point calibration in buffers This sets the slope and z...

Page 53: ...t may be calibrated on line against a known reference value If the sensor is removed thoroughly clean the pH sensor and place it into the pH calibration buffer stirring several times before letting it rest in the beaker Allow sensor to sit in solution long enough to achieve temperature equilibrium with the pH buffer maybe 5 minutes It is important that the pH buffer be fresh and at room temperatur...

Page 54: ... to keep the process at the setpoint To affect this control the controller must be used with properly selected control elements valves proper chemicals etc that enable the controller to add or subtract chemical rapidly enough This is not only specific to pumps and valves but also to line sizes delays in the system etc This section is included to give a brief description of tuning details for the P...

Page 55: ...ntually drive the input error to zero providing accuracy to the control loop It must be used to affect the accuracy in the servo action of the controller Like proportional gain increasing integral gain results in the control action happening quicker Set the I term to a number between 3 5 to start 1 2 more than P Like proportional gain increasing the integral term will cause the controller action t...

Page 56: ...er line This line will indicate XX X XX X mA with the X values simply indicating the current values With this display on the screen press and hold the ENTER key for about 5 seconds You will see a small m show up between the value and the mA value This indicates you are now in manual mode Once in manual you may increase the PID output by pressing the UP arrow or you may decrease the output by press...

Page 57: ...tial at the extreme ranges of the measuring scale In addition if a chemical process is not symmetrical that means it responds differentially to the addition and subtraction of chemical It is important in these applications to study steady state impact as well as step change impact to process changes In other words once the process has apparently been tuned under normal operating conditions the use...

Page 58: ...ufficient to simply wipe the membrane with a soft cloth or paper towel Immersing the tip of the sensor in 1N nitric acid solution will sometimes remove deposits that cause low sensitivity but this is not always the case If deposits do not easily wipe off or come off with acid soaking simply replace the membrane To change a membrane follow the Sensor Assembly procedure see section 5 1 Do not reuse ...

Page 59: ...t the back of the sensor to be submerged Allow the electrodes to soak in distilled water for 30 minutes 4 Put a new membrane and fresh electrolyte in the electrolyte chamber and reassemble the sensor Connect to the ClO2 monitor electronics and allow the sensor to stabilize for at least 24 hours The sensor can be placed in the flow cell with chlorinated water running through it during stabilization...

Page 60: ...rtain acids come in contact with process chemicals Make this determination before cleaning with any acid regardless of concentration 9 6 Replacing the Saltbridge and Reference Buffer Solution 1 Hold the sensor with the process electrode pointing up Place a cloth or towel around the saltbridge Turn the saltbridge counterclockwise by hand to loosen and remove the saltbridge Do NOT use pliers 2 Pour ...

Page 61: ...ell Maintenance The maintenance on the flow cell is simple cleaning The flow cell is clear to make examination of the condition of the sensor easier without interfering with operations The flow cell may be cleaned by wiping or by washing with detergents or dilute acids Do not try to clean with solvents as the acrylic may craze or crack Change the o ring in the flow cell yearly or if any damage is ...

Page 62: ...mits in the Instrument Specifications During troubleshooting it is many times helpful to disconnect all these outputs and place wire shorts across the terminals in the instrument to isolate the system and evaluate any problems which may be coming down the analog output connections 4 Do not run sensor cables or analog output wiring in the same conduits as power wiring If low voltage signal cables m...

Page 63: ...ck of the monitor to verify that the TC drive circuit is producing about 4 8 5 1 VDC open circuit Remove DVM completely and connect a 100 Ohm resistor from the BLACK to RED terminals The temperature reading should display approximately 0 C and the ClO2 reading should display approximately 0 ppm 10 4 Display Messages The Q46 Series instruments provide a number of diagnostic messages which indicate ...

Page 64: ...rror TC may be open or shorted Check sensor wiring and perform RTD test as described in sensor manual Check j box connections ClO2 Cal Fail Failure of ClO2 calibration FAIL icon will not extinguish until successful calibration has been performed or 30 minutes passes with no keys being pressed Clean sensor redo zero and span calibration If still failure sensor slope may be less than 25 or greater t...

Page 65: ...e seal D Connect a DVM between the red and white wires The red wire is part of the RTD circuit and the white wire is part of the measuring cell There should be no connection Reading resistance you should find an open circuit value of infinite resistance Any resistance at all indicates either water in the cable connector or the breakdown in an electrode seal E Connect the DVM between the red and bl...

Page 66: ...h transmitter power on and sensor connected place the multimeter s positive lead on the white position of the transmitter terminal strip and the negative lead on the black position The multimeter should read between 4 2 and 6 5 VDC 2 Disconnect the sensor s black and red wires from the transmitter or junction box Re check Step 1 3 Place the sensor in pH 7 buffer As in calibration allow the tempera...

Page 67: ... screw o ring 09 0015 Chlorine dioxide electrolyte 4 oz 120 cc 07 0096 Q22P pH Sensor with connector not waterproof 63 0101 25 Combination pH Sensor w Solution Ground 45 0268 1 NPT Flow Adapter 63 0101 09 0052 Reference Solution for pH sensor 07 0096 05 0066 Salt bridge for pH sensor 07 0096 00 0043 Constant Head Flowcell assembly with mounting plate 42 0014 Flowcell o ring each 07 0100 Junction b...

Page 68: ...Part 10 Troubleshooting 68 O M Manual Rev J 11 18 Note Instrument is supplied with sufficient spare parts for 6 12 months of operation For 2 year spare parts inventory 3 each of the items marked with an asterisk are required Lock Unlock Code 1461 ...

Page 69: ... improper storage or extended exposure to excessive gas concentrations Should inspection indicate that sensors have failed due to any of the above the warranty shall not apply The Manufacturer assumes no liability for consequential damages of any kind and the buyer by acceptance of this equipment will assume all liability for the consequences of its use or misuse by the Customer his employees or o...

Page 70: ...ODUCTS NH3 Ammonia CO Carbon Monoxide H2 Hydrogen NO Nitric Oxide O2 Oxygen CO Cl2 Phosgene Br2 Bromine Cl2 Chlorine ClO2 Chlorine Dioxide F2 Fluorine I2 Iodine HX Acid Gases C2H4O Ethylene Oxide C2H6O Alcohol O3 Ozone CH4 Methane Combustible Gas H2O2 Hydrogen Peroxide HCl Hydrogen Chloride HCN Hydrogen Cyanide HF Hydrogen Fluoride H2S Hydrogen Sulfide NO2 Nitrogen Dioxide NOx Oxides of Nitrogen S...

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