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ATI 

Q45P pH System  

 

Part 5 

–Calibration

 

 

32 

O&M Manual 
Rev-B (7/15) 

5.12  Sensor Offset 

 

 

Sensor offset is a number that indicates sensor output (expressed in mV) in 7.00 
pH buffer at 25 ºC.  Ideally, the sensor will output 0 mV under these conditions.  
A sensor offset  reading of  +10 mV indicates that the sensor will output  +10 mV 
when placed into a perfect 7.00 pH buffer at 25 ºC.  In other words, sensor offset 
shifts the entire mV/pH curve up or down.  Sensor offset is generally produced by 
a  small  voltage  drop  at  the  sensor  reference  junction.    Large  offsets  are  most 
typically  the  result  of  foulants  on  the  reference  junction,  an  aged  reference 
junction,  or  a  weak  reference  fill  solution.    The  instrument  does  not  allow 
calibrations on a sensor with an offset greater than +90 mV or less than 

–90 mV.  

Sensor offset information from the most recent calibration can be viewed at any 
time in the Measure Menu (See Section 4.7). 

 
 

5.13  2-Point Calibration Explained   

 

The 2-point calibration method involves the movement of the sensor through two 
known  pH  buffer  values.    Therefore,  the  sensor  must  be  removed  from  the 
application  to  utilize  this  method.    Two-point  calibration  adjusts  both  the  slope 
and  the  offset  of  the  sensor.    It  is  the  recommended  method  of  calibration  for 
highest accuracy.  In addition, this calibration method utilizes an automatic buffer 
recognition and compensation method. 
 

 

IMPORTANT:

  the  2-point  calibration  mode  MUST  be  performed  when  a  new 

sensor is first put into operation so that accurate calibration data is available for 
possible later 1-point calibrations. 

 

 

5.14  1-Point Calibration Explained    

 

The  1-point  calibration  method  is  generally  known  as  the  "grab  sample" 
calibration  method.    In  the  1-point  calibration  method,  the  sensor  may  be 
removed  from  the  application  and  placed  into  one buffer.    It may also  be  left  in 
the  measurement  process  and  calibrated  by  reference.    1-point  calibration 
adjusts  only  the  sensor  offset.    Since  the  sensor  slope  degrades  much  slower 
than the sensor offset, this method may be used as a frequent calibration method 
between more involved 2-point calibrations.  For example, a user may choose to 
perform on-line 1-point calibrations weekly and 2-point calibrations monthly.

 

 

 

5.2 

Performing a 2-Point Calibration 

 

The  2-point  calibration  method  utilizes  an  automatic  buffer  recognition  and 
compensation  system.    For  this  system  to  operate  properly,  the  user  must  first 
configure  the  proper  buffers  in  the  Set  Buffers  screen  (see  Section  4.9).    If  the 

Содержание Q45P

Страница 1: ...chnology 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 ...

Страница 2: ...Keys 17 4 52 Display 17 4 6 Software 19 4 7 Software Navigation 19 4 8 Measure Menu MEASURE 22 4 9 Calibration Menu CAL 23 4 10 Configuration Menu CONFIG 24 4 11 Control Menu CONTROL 27 4 12 Diagnostics Menu DIAG 28 PART 5 CALIBRATION 31 5 1 Overview and Methods 31 5 11 Sensor Slope 31 5 12 Sensor Offset 32 5 13 2 Point Calibration Explained 32 5 14 1 Point Calibration Explained 32 5 2 Performing ...

Страница 3: ...E 3 SENSOR CONNECTION 10 FIGURE 4 SENSOR CONNECTIONS COMBINATION ELECTRODES 11 FIGURE 5 EXTERNAL TEMPERATURE COMPENSATION 12 FIGURE 6 BATTERY BOARD CONNECTIONS 14 FIGURE 7 USER INTERFACE 16 FIGURE 8 SOFTWARE MAP 21 FIGURE 9 AUTOMATIC PH BUFFER TABLES 27 FIGURE 10 REPLACING THE SALTBRIDGE AND REFERENCE BUFFER 42 ...

Страница 4: ... and will run continuously for approximately 240 hours Warning If unit is to be stored for more that 6 months REMOVE the batteries from the holder to avoid potential damage from battery leakage The Q45P displays pH sensor temperature sensor output millivolts and output mV signals on the secondary line of the custom display The instrument may be used with either the high performance Q25 series sens...

Страница 5: ...n LED back light can be turned on if necessary for use in very low light conditions Sensor diagnostics monitor glass breakage sensor leaks and RTD condition Diagnostic messages provide a clear description of any problem with no confusing error codes to look up Messages are also included for diagnosing calibration problems Quick and easy two point and sample calibration methods include auto buffer ...

Страница 6: ...idity 0 to 95 indoor outdoor use non condensing to rated ambient temperature range Electrical Certification Ordinary Location cCSAus CSA and UL standards both approved by CSA pollution degree 2 installation category 2 EMI RFI Influence Designed to EN 61326 1 Output Isolation 600 V galvanic isolation Filter Adjustable 0 9 9 minutes additional damping to 90 step input Temperature Input Selectable Pt...

Страница 7: ... 0 007 pH Warm up Time 7 seconds to rated performance Instrument Response Time 6 seconds to 90 of step input at lowest setting Temperature Drift Span or zero 0 02 of span C Max Sensor Instrument 3 000 ft 914 meters w preamp Distance 30 ft 9 1 meters w o preamp Sensor Types Model Q25P pH w preamp 5 wire input or combination style pH electrode w TC 2 wire input Equipment bearing this marking may not...

Страница 8: ...ed to be a portable system it can be permanently mounted for longer term field use This is possible due to the very long battery life spans that can be achieved with the system 2 2 Portable Handle A removable handle is included with each unit that provides not only comfortable transportation of the system but the integral locking strap allows the system to be quickly mounted to pipes or rails for ...

Страница 9: ...ncy drives motors or other noisy electrical signal lines 3 2 Direct Sensor Connection The sensor cable should be routed into the enclosure through the right hand cord grip on the bottom of the enclosure Make sure the cord grips are snugly tightened after electrical connections have been made to prevent moisture incursion When stripping cables leave adequate length for connections in the transmitte...

Страница 10: ...ATI Q45P pH System Part 3 Installation 10 O M Manual Rev B 7 15 Figure 3 Sensor Connection ...

Страница 11: ...ent cable length will be severely limited 30 50 feet with electrodes of this type The length will depend on the specific electrode impedance and the quality of interconnect cable provided by the manufacturer 6 WHITE RED 1 2 GREEN 3 4 5 10 YELLOW 7 BLACK 8 9 12 SHLD 11 Tel 800 959 0299 Analytical Technology Inc DISCONNECT POWER WARNING BEFORE SERVICING OR DAMAGE MAY RESULT S N XXXX Options XXXX Vol...

Страница 12: ...ents a higher percentage of error signal when using a lower resistance RTD 6 WHITE RED 1 2 GREEN 3 4 5 10 YELLOW 7 BLACK 8 9 12 SHLD 11 Tel 800 959 0299 Analytical Technology Inc DISCONNECT POWER WARNING BEFORE SERVICING OR DAMAGE MAY RESULT S N XXXX Options XXXX Voltage XXXX P N 07 XXXX Model Q45P Pt1000 or Pt100 RTD TEMPERATURE SENSOR 3 WIRE EXTERNAL TEMPERATURE SENSOR DRIVE SENSE COM TEMPERATUR...

Страница 13: ...ing data In this mode the instrument will run continuously until the battery reaches the shut down level 1 6V It should be noted that rechargeable AA batteries reduce operational times dramatically as they typically contain much less energy than standard batteries The PWR switch disconnects the AA batteries and is only used to disconnect the battery if the system is not to be used for a long perio...

Страница 14: ...ff This switch is normally in the OFF position With the lock switch off the monitor will be turned on manually using the MENU key on the front of the monitor With the lock switch in the ON position the monitor will always be on when there is enough power to run the monitor The ON position is normally used when operating from an external power supply intended for continuous operation MODE This swit...

Страница 15: ... The Q45 portable instrument is primarily operated by software settings However there are also a few hardware details on the battery circuit board to note The battery board is a circuit board that sits in the rear of the Q45 enclosure and connects to the Q45 AUX port through a ribbon cable The battery board contains the battery clip for the two AA batteries and the output terminal strip for the tw...

Страница 16: ...re accessed from this user interface no internal jumpers pots etc Figure 7 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...

Страница 17: ...is also the ON button UP arrow To scroll through individual list or display items and to change number values LEFT arrow To move the cursor from right to left during changes to a number value ENTER To select a menu section or list item for change and to store any change 4 52 Display The large custom display provides clear information for general measurement use and user configuration There are thr...

Страница 18: ... important states of system functions The CAL CONFIG and DIAG icons are used to tell the user what branch of the software tree the user is in while scrolling through the menu items This improves software map navigation dramatically Upon entry into a menu the title is displayed such as CAL and then the title disappears to make way for the actual menu item However the icon stays on HOLD The HOLD ico...

Страница 19: ...he list items can then be scrolled through using the UP arrow key Once the last item is reached the list wraps around and the first list item is shown again The items in the menu sections are organized such that more frequently used functions are first while more permanent function settings are later in the list See Figure 8 for a visual description of the software Each list item allows a change t...

Страница 20: ...ENTER key This tells the system that the user wishes to perform a change on that item For single item type screens once the user presses the ENTER key part or all of the variable will begin to flash indicating that the user may modify that variable using the arrow keys However if the instrument is locked the transmitter will display the message Locked and will not enter user entry mode The instrum...

Страница 21: ... 1 Set Hold Cal Temp Set 2 5V 1 Set 0V 2 Set 2 5V 2 Fault List Sim Out Software Version Temperature Output 1 LIST ITEMS MENU SECTIONS Output 2 Default All Slope CONTROL or Entry Lock Set Delay Contrast Main Display Out 1 Mode Out 2 Mode Temp Units Sensor mV Offset Select TC Sensor Type Auto Buffer Glass Diags Figure 8 Software Map ...

Страница 22: ...e transmitter has automatically jumped to a manual 25 C setting due to a failure with the temperature signal input 132 mV Raw sensor voltage Useful for diagnosing problems 2 5V Transmitter output voltage Slope 100 Sensor output response vs ideal calibration This value updates after each calibration As the sensor ages the slope reading will decay indicating sensor aging Useful for resolving sensor ...

Страница 23: ...ference buffers or to adjust the sensor offset to match the sample reading See Part 5 Calibration for more details Cal Temp The temperature calibration function allows the user to adjust the offset of the temperature response by a small factor of 5 C The temperature input is factory calibrated to very high accuracy However long cable lengths and junction boxes may degrade the accuracy of the tempe...

Страница 24: ...function to the pH measurements being made Both the display and the output value are affected by the degree of damping Functions such as calibration are not affected by this parameter The calibration routines contain their own filtering and stability monitoring functions to minimize the calibration timing Press ENTER to initiate user entry mode and the value will flash Use the arrow keys to modify...

Страница 25: ...This selection is critical for control of the internal diagnostics and compensation factors Press ENTER to initiate user entry mode and the entire value will flash Use the UP arrow key to modify the desired value Selections are 1 for Q25P glass sensor 2 for combination electrode 3 for Q25P antimony electrode and 4 for pure water sensor using special compensation table Press ENTER to store the new ...

Страница 26: ...99 30 9 95 40 4 03 40 6 97 40 9 87 50 4 05 50 6 98 50 9 80 60 4 08 60 6 98 60 9 75 70 4 12 70 6 97 70 9 73 80 4 16 80 6 99 80 9 73 90 4 21 90 7 01 90 9 75 95 4 24 95 7 01 95 9 77 4 00 pH 7 00 pH 9 18 pH C 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 7...

Страница 27: ...splay units for temperature measurement Press ENTER to initiate user entry mode and the entire value will flash Use the UP arrow key to modify the desired display value The choices are F and C Press ENTER to store the new value 4 11 Control Menu CONTROL The Control Menu contains all of the output control user settings Set 0V 1 Set 2 5V 1 Set 0V 2 4 65 pH 6 79 pH 9 23 pH C pH C pH C pH 0 4 67 0 6 8...

Страница 28: ...pplication problems Set Hold The Set Hold function locks the voltage output values on the present process value 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 The transfer out of HOLD is bumpless on the both analog outputs th...

Страница 29: ...ion failure will re occur Press ENTER to initiate view of the highest priority failure The display will automatically return to normal after a few seconds Sim Out The Sim Out function allows the user to simulate the pH level of the instrument to check the output settings The user enters a pH value directly onto the screen and the output responds as if it were actually receiving the signal from the...

Страница 30: ...pplications such as some plating operations Default All The Default All function allows the user to return the instrument back to factory default data for all user settings It is intended to be used as a last resort troubleshooting procedure All user settings are returned to the original factory values Hidden factory calibration data remains unchanged Press ENTER to initiate user entry mode and th...

Страница 31: ... is operating normally at 8 pH buffer values of 9 18 pH and 7 00 pH are preferred over buffers of 4 00 pH and 7 00 pH If possible select one of the buffers to be near 7 00 pH NOTE Buffers must be at least 2 pH units apart to ensure accurate calibration The system provides two methods of pH calibration 2 point and 1 point These two methods are significantly different See Sections 5 13 and 5 14 for ...

Страница 32: ...point calibration adjusts both the slope and the offset of the sensor It is the recommended method of calibration for highest accuracy In addition this calibration method utilizes an automatic buffer recognition and compensation method IMPORTANT the 2 point calibration mode MUST be performed when a new sensor is first put into operation so that accurate calibration data is available for possible l...

Страница 33: ...H will then be displayed 4 Press the ENTER key The screen will display a flashing 1 for 1 point or a 2 for 2 point calibration Using the UP arrow key set for a 2 point calibration and press ENTER 5 The display will prompt the user to place the sensor in the first buffer and press ENTER If the sensor has been placed into this buffer already once the temperature has stabilized press ENTER to continu...

Страница 34: ...omatic value press ENTER 12 The system now begins acquiring data for the calibration value of this buffer point As data is gathered the units for pH and or temperature may again flash indicating unstable parameters 13 If accepted the screen will display the message PASS with the new slope and offset readings then it will return to the main measurement display If the calibration fails a message ind...

Страница 35: ...acquiring data for the calibration value As data is gathered the units for pH and temperature may flash Flashing units indicate that this parameter is unstable The calibration data point acquisition will stop only when the data remains stable for a pre determined amount of time This can be overridden by pressing ENTER If the data remains unstable for 10 minutes the calibration will fail and the me...

Страница 36: ...tuations Procedure 1 Scroll to the CAL menu section using the MENU key and press ENTER or the UP arrow key 2 Press the UP arrow key until Cal Temp is displayed 3 Press the ENTER key The message Place sensor in solution then press ENTER will be displayed Move the sensor into the calibration reference if it hasn t been moved already and wait for temperature equilibrium to be achieved Press ENTER to ...

Страница 37: ...op exists 5 Verify that the black rubber shipping boot has been removed from the end of the sensor prior to submersion If the sensor has been left to dry out allow sensor to be submerged in buffer or water to re hydrate for at least 4 hours The saltbridge may need replacement if the sensor has dried out for too long 6 2 Instrument Checks 1 Remove sensor completely and connect 1100 Ohms from the ye...

Страница 38: ... HIGH Sensor slope from calibration is greater than 110 Get fresh cal solutions allow temperature and pH readings to fully stabilize check for correct buffer values Slope LOW Sensor slope from calibration is less than 80 Clean sensor get fresh cal solutions allow temperature and pH readings to fully stabilize check for correct buffer values Out of Range Input value is outside selected range of the...

Страница 39: ...Temp Low The temperature reading is 10 ºC The temperature reading is under operating limits Check wiring and expected temp level Perform RTD test as described in sensor manual Recalibrate sensor temperature element if necessary TC Error TC may be open or shorted Check sensor wiring and perform RTD test as described in sensor manual Meas Break Leakage detected on measuring electrode of sensor Measu...

Страница 40: ...ll failure TC Cal Fail Failure of temperature calibration Clean sensor check cal solution temperature and repeat sensor temp calibration TC calibration function only allows adjustments of 6 ºC If still failure perform sensor tests as described in sensor manual Replace sensor if still failure Eeprom Fail Internal nonvolatile memory failure System failure consult factory Chcksum Fail Internal softwa...

Страница 41: ...nsor for several minutes in the soap solution Use a small extra soft bristle brush such as a mushroom brush to thoroughly clean the electrode and saltbridge surfaces If surface deposits are not completely removed after performing this step use a dilute acid to dissolve the deposits After soaking rinse the sensor thoroughly with clean warm water Placing the sensor in pH 7 buffer for about 10 minute...

Страница 42: ...er of the sensor with fresh Reference Cell Buffer The chamber holds 6 to 7 mL of solution MAKE SURE that 6 to7 mL is used when refilling The chamber should be FULL 4 Inspect the new saltbridge to verify that there are 2 o rings inside the threaded section of the saltbridge 5 Place the new saltbridge over the ground assembly of the sensor Place a cloth or towel around the saltbridge and hand tighte...

Страница 43: ...ffer at least 2 pH units away will be needed 1 With 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 red green yellow and white wires from the transmitter or junction box Re check Step 1 3 Plac...

Страница 44: ...or with clean water and place it in the second buffer Allow the temperatures to equilibrate as before Now measure the sensor span reading Use the following table to determine approximate mV pH mV 2 00 296 4 00 178 7 00 0 9 18 129 10 00 178 NOTE The mV values listed above are for ideal conditions sensor offset 0 mV and therefore represent midpoints in a range The table shows the difference in mV wh...

Страница 45: ... B 7 15 Spare Parts Part No Description 07 0004 Q45P pH transmitter 9 VDC Dual 0 2 5 VDC outputs 07 0062 pH Sensor with 30 cable 05 0060 Saltbridge 05 0057 Regeneration Kit saltbridge fill solution Lock Unlock Code 1451 ...

Страница 46: ...d exposure to excessive gas concentrations Should inspection indicate that sensors have been expended rather than failed prematurely 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 others A defect...

Страница 47: ...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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