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8

4

LIQUID HANDLING SECTION

4.1

Principle of Operation – Figs. 4.1

The monitor uses a Nitrate Ion–Selective Electrode in conjunction
with a double junction Reference Electrode. The Nitrate Electrode
is a liquid membrane type sensor employing an ion–exchange
liquid in contact with the sample via a porous membrane. A
reservoir of liquid behind the membrane ensures a constant feed
of exchanger. An inner central electrode containing a gelled filling
solution makes liquid contact with the back of the membrane. The
inner electrode is connected to main electronic unit via a
screened cable. It is useful to remember that the output from the
sensor is logarithmic with respect to the nitrate ion concentration.

The electro–chemical cell is completed by the reference
electrode, which generates a stable reference potential and is
also connected to the main electronic unit. It comprises a
reference element in a salt bridge container which is in contact
with an outer electrolyte via a porous ceramic junction. The outer
electrolyte then contacts the sample via another ceramic junction.
This double junction arrangement protects the inner element from
contamination.

Range of measurement can be set to any two consecutive
decades of concentration between 0.2 to 1000 mg l

–1

as N or 1 to

5000 mg l

–1

as NO

3

–

.

Under typical circumstances, with appropriate standard solutions
and calibration frequencies, accuracies better than ±5% of
reading or 0.1 mg l

–1

as N or 0.5 mg l

–1

as NO

3

–

whichever is the

greater, can be achieved.

Fig. 5.1 Electrical Connections Layout

4

LIQUID HANDLING SECTION…

Sample
Inlet

Two Channel

Peristaltic Pump

To Electronics Section

Reference
Electrode

Electrode
Flowcell

Drain via
Constant
Head Unit

Heater

Sample

Heater Coil

Nitrate

Electrode

Constant Head Unit

Sample / Calibrate

Solenoid Valves

Reagent Solution

Container

Standard

Solution 1

(Low)

Temperature

Sensor

Standard

Solution 2

(High)

SV1

SV2

Overflow

Drain

Contaminated

Drain

Out of Sample

Float Switch

From
Flowcell

Ion

Exchange

Solution

Filling

Aperture

Ion

Exchange

Solution

Bung

Gelled

Reference

Solution

Ag/AgCl

Reference

Electrode

Membrane

Washer

Body

Body Seal

Washer

End Cap

Membrane

Fig. 4.2 Flow Schematic

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Содержание Nitrate 8236

Страница 1: ...ISE Nitrate Monitor 8236 Instruction Manual IM 8236_8 ...

Страница 2: ...ommitted to teamwork high quality manufacturing advanced technology and unrivalled service and support The quality accuracy and performance of the Company s products result from over 100 years experience combined with a continuous program of innovative design and development to incorporate the latest technology The UKAS Calibration Laboratory No 0255 is just one of the ten flow calibration plants ...

Страница 3: ... Page 22 6 2 8 Calibration User Code Page 24 6 2 9 Set Up Temperature Control Page 25 6 2 10 Electrical Calibration 25 6 2 11 Electrical Calibration Page 26 7 CALIBRATION 29 7 1 Calibration Sequence 29 8 MAINTENANCE 30 8 1 Chemistry 30 8 1 1 Reagent Solution 30 8 1 2 Standard Solutions 30 8 1 3 Reference Salt Bridge Solution 30 8 2 Scheduled Servicing 30 8 2 1 Regular Visual Checks 30 8 2 2 Four W...

Страница 4: ...sample and reagent solutions through the monitor to the mixing point The resulting combined solution is then temperature controlled to remove the effects of sample and ambient temperature variations The conditioned solution is then delivered to the flowcell under constantly flowing conditions where the ion measurement takes place This measurement is carried out using an ion selective sensing elect...

Страница 5: ...to the Microprocessor Unit Sample and drain pipework are brought in through the bottom of the case 2 4 Sampling Requirement In addition to being as close as possible to the monitor the sampling point must provide a thoroughly mixed representative sample The sample must also conform to the following conditions a Sample flow rates must be between 5 ml min 1 and 1250 ml min 1 b Sample temperature sho...

Страница 6: ...s are for use only with equipment with no accessible live parts The relay contacts are voltage free and must be appropriately connected in series with the power supply and the alarm control device which they are to actuate Ensure that the contact rating is not exceeded Refer also to Section 2 8 for relay contact protection details when the relays are to be used for switching loads Do not exceed th...

Страница 7: ...o the isolated input of another device c Relay 1 and 2 two concentration alarms d Relay 3 calibration mode indication This indicates when the instrument is off line during a calibration e Relay 4 instrument OUT OF SERVICE indication This indicates that the monitor readings are suspect and it is in need of attention f Relay 5 OUT OF SAMPLE indication of loss of sample g Optional serial interface co...

Страница 8: ...s use an alternative IN5406 type 600 V peak inverse voltage at 3 A part no B7363 Note For reliable switching the minimum voltage must be greater than 12 V and the minimum current greater than 100 mA 2 INSTALLATION 2 8 Relay Contact Protection and Interference Suppression Fig 2 5 If the relays are used to switch loads on or off the relay contacts can become eroded due to arcing Arcing also produces...

Страница 9: ...ime e Verify that there is an adequate supply of sample to the monitor constant head unit f Fit the pump platen on the peristaltic pumps see Section 8 2 7 and switch the pumps on with the switch on the side of the monitor Ensure that the peristaltic pumps rotate and check that sample and reagents are being drawn into the monitor by observing the progress of any small bubbles present in the inlet t...

Страница 10: ...amic junction The outer electrolyte then contacts the sample via another ceramic junction This double junction arrangement protects the inner element from contamination Range of measurement can be set to any two consecutive decades of concentration between 0 2 to 1000 mg l 1 as N or 1 to 5000 mg l 1 as NO3 Under typical circumstances with appropriate standard solutions and calibration frequencies ...

Страница 11: ...ser Junction Box Mains Supply see Fig 2 3 Concentration Alarm Relays Calibration Mode Relay Out of Service Relay Current Outputs Out of Sample Relay External User Connections External Serial Interface Connections Reference Electrode Ion Selective Electrode Sample Calibrate Soleniod Valves Interconnection Cables Out of Sample Float Switch Pump and Stirrer Motors Liquid Handling Section Protective E...

Страница 12: ...volatile memory Note The instrument responds instantly to any programme change but the new value is lost in the event of a power interruption if it has not been Entered Parameter Advance used for selecting a particular parameter from a programme page Used for increasing or decreasing a parameter value or stepping up or down through a selection of parameters applicable to a particular function Note...

Страница 13: ...aw OP1 FSD OP1 Zero OP2 Cal Hold OP2 Law OP2 FSD OP2 Zero Test Output Zeros Test Output FSD Alter Sec Code Output SET UP ALARMS A1 Enabled A1 Action A1 Failsafe A1 Hysteresis A1 Delay A1 Setpoint A2 Enabled A2 Action A2 Failsafe A2 Hysteresis A2 Delay A2 Setpoint SET UP CLOCK Set Clock Set Year Set Month Set Day of Month Set Hours Set Minutes Cal Date Cal Time Cal Interval CALIBRATION mV Zero mV F...

Страница 14: ...ages to be displayed Unauthorised entries to this page are inhibited by a 5 digit security code which is displayed immediately after the page header In the programming pages displayed values indicated xxxxx are for viewing only and cannot be altered by the operator Displayed values indicated can be altered using the and switches When the desired reading is displayed operate the Enter switch The l ...

Страница 15: ...ntrol Temperature The heater block control temperature is displayed in degrees Celsius Advance to next parameter Slope Check Value The slope value should be between 70 and 110 If the value is outside these limits check the electrode Advance to next parameter Date The date is displayed Advance to next parameter Time The time is displayed Advance to next parameter Next Calibration Date The date when...

Страница 16: ...next parameter Initiate Calibration manual Select Yes to carry out a manual calibration or No to return to the top of the page Enter must be pressed to initiate a manual calibration Calibrating Standard 1 The upper display shows the nitrate concentration value The display remains until a stable output is obtained from the probe Toggle between the two displays Electrode Millivolts Note Pressing Cal...

Страница 17: ...ndard 2 The upper display shows the nitrate concentration value The display remains until a stable output is obtained from the probe Toggle between the two displays Electrode Millivolts The probe output can also be displayed during calibration Note Pressing Cal during a calibration aborts the sequence and returns to normal operation When a stable probe output is detected the display automatically ...

Страница 18: ...lay Zero Enter Display FSD Enter Display as N Nitrate Enter or or Store Advance to next parameter Ion Units Select the required display units for ion concentration Store Advance to next parameter Display Zero Set the required value for display within the ranges nitrate 1 to 50 or nitrate as nitrogen 0 2 to 10 0 Store Advance to next parameter Display Full Scale The full scale value is automaticall...

Страница 19: ... Store Advance to next parameter Output 1 Law Current Output 1 can be either logarithmic or linear Select Log or Lin Store Advance to next parameter Output 1 Full Scale Current Output 1 full scale range 10 to 5000 mg l 1 as NO3 or 2 to 1000 mg l 1 as N i e minimum span is 1 decade Set the required concentration value for Current Output 1 full scale Store Advance to next parameter Output 1 Zero Set...

Страница 20: ...arithmic or linear Select Log or Lin Store Advance to next parameter Output 2 Full Scale Current Output 1 full scale range 10 to 5000 mg l 1 as NO3 or 2 to 1000 mg l 1 as N i e minimum span is 1 decade Set the required concentration value for Current Output 2 full scale Store Advance to next parameter Output 2 Zero Set the required concentration value for Current Output 2 zero Note If the Output 2...

Страница 21: ...ument automatically transmits a current output full scale test signal on both outputs Example For a 4 to 20 mA current output range 20 mA is transmitted Advance to next parameter Alter Security Code Set the Security Code required between 0 and 19999 This value must then be entered again to access the secure parameters from Operating Page 1 Store Advance to next parameter Proportional Output Percen...

Страница 22: ...ired select Yes otherwise select No see Table 6 1 Store Advance to next parameter Alarm A1 Hysteresis Adifferential set point can be set as a percentage of the set point value The differential setting operates about the set point Example A 5 differential setting operates 2 5 above and below the setpoint Select the differential required between 0 and 5 in 1 increments Store Advance to next paramete...

Страница 23: ...ence Summary n o i t c A e f a s l i a F e u l a V d e r u s a e M s u t a t S y a l e R n o i t a c i d n I D E L h g i H S E Y t n i o p t e S e v o b A t n i o p t e S w o l e B d e s i g r e n e e D d e s i g r e n E g n i h s a l F f f O h g i H O N t n i o p t e S e v o b A t n i o p t e S w o l e B d e s i g r e n E d e s i g r e n e e D g n i h s a l F f f O w o L S E Y t n i o p t e S e v...

Страница 24: ...Up Real Time Clock Select Yes to set up the clock otherwise select No Store Advance to next parameter Set Year Set the appropriate year Store Advance to next parameter Set Month Set the appropriate month Store Advance to next parameter Set Day Set the appropriate day of the month Store Advance to next parameter Set Hours Set the appropriate hour 24 hour clock Store Advance to next parameter Contin...

Страница 25: ...he appropriate seconds Store Advance to next parameter Calibration Date day of the month Set the day of the month when the first automatic calibration is to be carried out Store and advance to next parameter Calibration Date month Set the month when the first automatic calibration is to be carried out Store and advance to next parameter Calibration Date year Set the year when the first automatic c...

Страница 26: ...val Set the calibration interval required between automatic calibrations starting from the calibration date 6 hours 12 hours or 1 to 7 days in 1 day increments Store Return to top of Set Up Clock Page or Advance to Calibration User Code Page 6 2 8 Calibration User Code Page The calibration user code is required to gain access to the Set Up Temperature Control and Calibration Pages The access code ...

Страница 27: ...erances of the resistors within the box 6 PROGRAMMING 6 2 9 Set Up Temperature Control Page The parameters within this page are factory preset and should not require any adjustment 200 5 SET UP TEMP CONTROL Integral Time Cycle Time Prop Band 20 CALIBRATION or Digital milliammeter 0 to 20 mA refer to Fig 2 4 to identify the output range Preparation a Switch off the supply and disconnect the tempera...

Страница 28: ...put Full Scale Set the millivolt source to 400 mV Set the display to 400 mV Store New value is accepted only when input is stable Advance to next parameter Temperature Zero Set the resistance box to 96 09 resistive equivalent of 10 C Set the display to 10 C Store New value is accepted only when input is stable Advance to next parameter Temperature Full Scale Set the resistance box to 142 29 resist...

Страница 29: ...tput range 20 mA is transmitted Set the milliammeter reading to the current output 1 full scale level i e 1 mA 10 mA or 20 mA as applicable Store Advance to next parameter Adjust Current Output 2 Zero The monitor transmits a zero signal e g for a 4 to 20 mA output range 4 mA is transmitted Set the milliammeter reading to the current output 2 zero level i e 0 mA zero based ranges or 4 mA 4 to 20 mA...

Страница 30: ...nce to next parameter Calibration Time 3 The displayed value is preset at the factory and must not be altered See Table 7 1 Advance to next parameter Alter Calibration Code The calibration user code inhibits access to the Set Up Temperature Control Page and the Calibration Page see Section 6 2 8 Set a suitable user code between 0 and 19999 Store Return to top of Electrical Calibration Page or Retu...

Страница 31: ... is energised Two solenoid valves SV1 and SV2 operate sequentially to shut off the sample and admit standard solutions of known concentration one low and one high STD1 and STD2 to the sample path Once a valve is energised sufficient time preset to suit the sensor response time is allowed for the previous solution to be displaced and for the sensor to respond to the new solution before the sensor o...

Страница 32: ...tionship of nitrate NO3 to nitrogen N is 62 14 8 1 3 Reference Salt Bridge Solution The Reference Electrode contains a salt bridge solution of 1 M sodium sulphate Prepare as follows a Dissolve 14 2 0 1 g of analytical reagent grade anhydrous sodium sulphate Na2 SO4 in approximately 80 ml of high purity water b Dilute the solution to 100 ml with more high purity water c Store the solution in a tigh...

Страница 33: ... manual with a 0 05 500 mg l 1 chlorine solution i e half the concentration of the above solution Tubing between the Ultrafilter and the analyser should also be flushed through along with the constant head tank a Remove sensors for short term storage before cleaning see Section 8 3 1 b Remove the reagent and calibration solution take up tubes from their respective containers Fill a calibration con...

Страница 34: ... Spares Kit If one is not supplied it should be ordered before the end of the first year of operation This kit includes all the components which are recommended for replacement annually see Section 10 This annual refurbishment ensures a high level of reliability from the monitor over a period of many years Another kit should be ordered when this one is used so that all the items are available thro...

Страница 35: ... Spares Kit are replaced after one year of operation Carry out the following procedure 1 to 8 Table 8 1 Unscheduled Servicing Messages 1 8 4 3 2 6 5 Remove the pump platen by applying gentle downward force to the platen while turning the catch mechanism to the vertical position and pulling the catch forward Lower the pump platen only from directly above on to the pump tubes until the catch mechani...

Страница 36: ...rting the monitor 8 3 2 Long Term For periods longer than one month the nitrate electrode should be completely dismantled rinsed out and returned to the box in which it was supplied Proceed as follows a Withdraw the inner electrode wipe the tip with a tissue and wash out the gelled filling solution with distilled water Allow to air dry and refit the protective rubber teat Warning Wear protective g...

Страница 37: ...intain the level in the electrode at a depth of approximately 15 mm Use the syringe in the refurbishing kit and clean with methanol d Check level of salt bridge solution in reference electrode e Check that the fill hole stopper has been moved away from the salt bridge filling solution hole in the reference electrode f Refurbish nitrate electrode see Section 8 5 g Reference electrode liquid junctio...

Страница 38: ...of the following a Loss of solution flow through the flowcell breaking the electrical connection between the electrode pair b Low level of salt bridge solution in the reference electrode c Open circuit electrode internally e g broken connection blocked liquid junction in reference electrode etc d Broken electrical connections between the sensor and the Microprocessor Unit sensor input e Sensor coa...

Страница 39: ...isplay range logarithmic or linear Computer interface Modbus via RS433 RS423 serial interface Alarms Two high or low concentration alarms Remote calibration mode indication Remote monitor Out of Service indication includes Loss of Mains Supply Loss of Sample Calibration Failed Electronic Failure All voltage free 250V 5A non inductive changeover relay contacts Concentration alarm adjustment Program...

Страница 40: ... t c e n n o c e b u T 1 0 4 2 1 3 2 8 t e n g a m r e r r i r s l l e c w o l F 1 0 4 2 0 3 2 8 y l b m e s s a r o s n e s e r u t a r e p m e T 1 9 1 0 4 3 2 0 e p y t t r e k r u B e v l a v d i o n e l o S 1 2 9 0 2 3 2 0 r e b m u n t r a p e v l a v s m e t s y S n o i t a m o t u A d i u l F s e c a l p e r e v l a v s i h T h c i h w 7 0 2 0 3 2 8 r e b m u n t r a p y l b m e s s a e v l...

Страница 41: ... 0 5 4 d r a o b y l p p u s r e w o P 1 5 7 2 0 0 0 5 4 d r a o b y a l p s i d t n e m g e s 7 t i g i d 5 1 3 4 4 0 0 0 5 4 t i u c r i c i x e l f y a l p s i d t i g i d 5 1 3 0 6 0 0 0 5 4 t i u c r i c i x e l f y a l p s i D 1 5 9 3 0 0 0 5 4 h c t i w s e n a r b m e M 1 5 5 8 0 0 0 5 4 y l b m e s s a B C P s u b d o M l a i r e S 1 5 1 7 0 0 0 5 4 y l n o s r o t i n o m d e k r a m E C...

Страница 42: ...ractor RS Stock Number 404 727 APPENDIX A REPLACING SOFTWARE EPROM Fig A 2 Procedure to Access the Processor PCB A 2 Access the PCB Fig A 2 Fluoride EIL8231 Undo locks and swing open the case to reveal the microprocessor unit Microprocessor Unit Hinged Case 1 2 Open microprocessor unit see Fig A 2 Remove processor PCB See Fig A 3 Unlock and open cover plate and hinge out to expose captive screws U...

Страница 43: ...roved tool see Caution in Section A 1 1 Fit the replacement IC press home firmly 2 Go to Section A 5 for reassembly instructions 3 A 4 Changing the EPROM Fig A 4 A 5 Completing the Procedure 1 Fit the PCB using the reverse procedure in Fig A 3 Important Note Ensure that the washers are fitted between the PCB cover and the PCB 2 Close the microprocessor section using the reverse procedure in Fig A ...

Страница 44: ...42 NOTES ...

Страница 45: ...43 NOTES ...

Страница 46: ...44 NOTES ...

Страница 47: ...ntation pH conductivity and dissolved oxygen transmitters and sensors ammonia nitrate phosphate silica sodium chloride fluoride dissolved oxygen and hydrazine analyzers Zirconia oxygen analyzers katharometers hydrogen purity and purge gas monitors thermal conductivity Customer Support We provide a comprehensive after sales service via a Worldwide Service Organization Contact one of the following o...

Страница 48: ...ithout notice Printed in UK 07 05 ABB 2005 ABB Limited Oldends Lane Stonehouse Gloucestershire GL10 3TA UK Tel 44 0 1453 826661 Fax 44 0 1453 829671 ABB Inc Analytical Instruments 9716 S Virginia St Ste E Reno Nevada 89521 USA Tel 1 775 850 4800 Fax 1 775 850 4808 ABB has Sales Customer Support expertise in over 100 countries worldwide www abb com ...

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