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Great Lakes Instruments 692P, Руководство пользователя

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Great Lakes Instruments 692P Скачать руководство пользователя страница 51

Model 692P

Rev. 9-898

-50-

PART FIVE - PRINCIPLE OF OPERATION

See Figure 5-1 for functional diagram pertaining to these
descriptions:

1. The power-supply section (not shown) converts line

power to appropriate voltages for circuit operation.

 

2. The analog-to-digital converter section accepts signals

from the pH sensor (GLI 5-wire Differential Technique
sensor or combination electrode) and from a tempera-
ture sensor (300 ohm thermistor or 1000 ohm platinum
RTD). This section converts these analog pH and tem-
perature signals to digital signals for use by the
microprocessor.

 

 

 

 

FIGURE 5-1   Instrument Operations Block Diagram

Содержание 692P

Страница 1: ...Manual No 692P Revision 9 898 MODEL 692P TWO WIRE pH TRANSMITTER...

Страница 2: ...onal pH combination electrode Single Point Temperature Calibration Two Point Temperature Calibration Section 5 3 start on pg 30 Single Or Two Point Method Section 6 2 or 6 3 start on pg 32 Two Point O...

Страница 3: ...Model 692P Rev 9 898 2...

Страница 4: ...L REQUIREMENTS 2 1 Location 10 2 2 Mounting 10 12 2 3 Plugging Conduit Holes 12 SECTION 3 ELECTRICAL CONNECTIONS 3 1 GLI 5 Wire Differential Technique Sensor 12 3 2 Conventional Combination Electrode...

Страница 5: ...Reading 300 Ohm Thermistor Compensation 30 1000 Ohm RTD Compensation 30 Fixed Resistor Compensation 31 5 2 Single Point Method 31 5 3 Two Point Method 31 32 SECTION 6 pH CALIBRATION 6 1 Summary of Met...

Страница 6: ...tion 45 46 SECTION 2 mV CALIBRATION 2 1 Single Point Method 47 2 2 Two Point Method 47 48 SECTION 3 SIMULATING MEASURED VALUES 49 PART FIVE PRINCIPLE OF OPERATION 50 51 PART SIX SERVICE AND MAINTENANC...

Страница 7: ...ontrols on Backside of Display Module Assembly and Electrical Hookup Details 24 Figure 3 3 Display Modes and Call up Chart of Setup Variables 27 Figure 5 1 Instrument Operations Block Diagram 50 TABLE...

Страница 8: ...cedure messages prompt the operator during instrument setup and calibration System diagnostic error messages flash whenever the instrument detects an out of range input for pH and or temperature or a...

Страница 9: ...as power is applied When power is removed all stored values will be lost Factory set defaults will replace all user entered values when power is re applied The back up battery is replaceable WARNING...

Страница 10: ...de to represent a one pH unit or larger segment of the measuring scale Hazardous Area Classification Intrinsic Safety UL and CSA Class I Div 1 Groups A B C D Class II Div 1 Groups E F G Baseefa Zones...

Страница 11: ...MUST ALWAYS BE LOCATED IN A SAFE AREA 1 Locate the 692 within 3000 feet of where the GLI 5 wire Differential Technique sensor is to be installed If a combination electrode is used the 692 must be with...

Страница 12: ...method determines verti cal or horizontal pipe mounting configuration To surface mount the Model 692 1 Place tabs in appropriate locations on back of enclosure and fasten with screws provided 2 Posit...

Страница 13: ...com partment cover Figure 3 2 shows terminal designations for instrument hookup If the transmitter is located in a hazard ous area refer to Section 3 5 for wiring details NOTE For a CE approved Model...

Страница 14: ...amp the braided shield reference electrode wire un der TB4 REF terminal as shown in Figure 2 3 If the electrode has a triaxial cable clamp the inner braided shield reference electrode wire under TB4 R...

Страница 15: ...sensor it is set TEMP COMP switch to THERM or RTD position respectively 2 Connect separate temperature sensor GLI p n 60A2A9860 series wires to TEMP COMP termi nals on TB6 Figure 3 2 C Fixed with Ext...

Страница 16: ...II Division 1 haz ardous area without an explosionproof enclosure when powered through an approved barrier Refer to Section 3 5 for details on hazardous area wiring requirements The isolated 4 20 mA...

Страница 17: ...ge drop across the load s is 6 volts 300 ohms x 20 mA 6 000 mV or 6 volts Subtract 6 volts from the 24 volt source to determine that 18 volts is available to power the Model 692 The 18 volts is within...

Страница 18: ...wer supply that provides no more than 28 volts DC n Powered through a Pepperl Fuchs KHD3 ICR Ex130 200 transformer isolated barrier GLI p n 1F1054 Furthermore each respective regulatory agency require...

Страница 19: ...ved System The 692P is Baseefa Approved as intrinsically safe in a Zone 0 or 1 hazardous area Groups IIC through IIA only when 1 Using a GLI pH sensor with a model number listed on GLI control drawing...

Страница 20: ...TORY SETUP CHARGE WILL BE INCURRED All switches status indicators and program jumpers used for instrument operation are described in this section Famil iarize yourself with each item before operating...

Страница 21: ...h each press Refer to Tables B C and D in Section 3 for a complete listing of all setup variables 3 key Figure 3 1 n With display in measurement mode This key has no effect n With display in examinati...

Страница 22: ...key item 9 n With display in examination mode A Enters displayed value into memory if within ac ceptable range for the indicated setup variable Display flashes OK for approximately 5 seconds to confir...

Страница 23: ...This key has no effect 8 END CAL HOLD recessed button Figure 3 1 n With display in measurement mode Activates output hold feature when pressed together with OUTPUT key item 9 n With display in examina...

Страница 24: ...a corresponding loop current 4 or 20 mA 14 pH POSITION off right Selects the high out of range state default When the 692 detects a defective pH sensor or shorted sensor cable the display indicates 14...

Страница 25: ...up vari able values even when power is lost or turned off OFF Disconnects battery when the 692 is not to be used for an extended time CAUTION If loop power is removed from the 692 and you disconnect t...

Страница 26: ...display Indicates that Model 692 keypad entry is locked to prevent unauthorized alteration of stored setup variable values Refer to Section 8 for security lock feature in structions NOTE When the 692...

Страница 27: ...AM CANCEL key at any time returns the display to the measuring mode Use the and keys to change displayed setup values Each press of the key increases the flashing digit value by one Holding down this...

Страница 28: ...XT NEXT NEXT EXAM CANCEL EXAM CANCEL NEXT NEXT EXAM CANCEL 0000 Lock SLOPE HI CAL VALUE HI CAL VALUE LO CAL VALUE HI CAL VALUE NEXT NEXT NEXT NEXT NEXT HI BUFFER VALUE LO OUT VALUE HI OUT VALUE LO BUF...

Страница 29: ...0 14 00 7 00 LO BUFFER VALUE Sets the value of lower buffer used for two key pH calibration Two point method Table method 0 00 1 09 10 00 10 A 4 00 4 00 HI BUFFER VALUE Sets the value of higher buffer...

Страница 30: ...ers the Model 692 memory to retain all user entered setup variable values The 692 is supplied with its BATTERY jumper Fig ure 3 2 in the OFF position Make sure to place this jumper in the ON position...

Страница 31: ...r cable the instrument will re spond according to the default state selected with SWITCH 2 Figure 3 2 Refer to Section 1 2 item 10 for details about this switch and its settings SECTION 5 TEMPERATURE...

Страница 32: ...emperature and allow the reading to stabilize The sensor may take several minutes to attain temperature equilibrium with the solution 3 Press EXAM CANCEL key to place display in examina tion mode and...

Страница 33: ...9 Press NEXT key twice to make display indicate tem perature HI CAL VALUE 10 Use and keys to make display indicate the known temperature value NOTE Entry value must be between 25 0 and 100 0 C and at...

Страница 34: ...qualified person initially enters two buffer values Anytime thereafter a novice operator can ac curately calibrate the instrument for each point by simply pressing two keys The only requirement is pl...

Страница 35: ...ean sensor and two fresh ac curate pH buffers pH 7 and pH 4 buffers are recommended and are readily available If pH 4 buffer is not available substitute pH 10 buffer 1 With display in pH measuring mod...

Страница 36: ...in higher value buffer Allow sen sor to attain temperature equilibrium with the buffer 7 Press EXAM CANCEL key to place display in examina tion mode 8 Press NEXT key twice to make display indicate pH...

Страница 37: ...y 1 Press NEXT key until display indicates LO BUFFER VALUE 2 Use and keys to make display indicate the de sired value for the lower calibration point NOTE Entry value must be 10 00 pH or lower 3 Press...

Страница 38: ...CAL VALUE or HI CAL VALUE If display indicates the higher value press BEGIN CAL key again to display lower value After pressing BEGIN CAL you have 30 minutes to com plete the calibration of this point...

Страница 39: ...r additional details This completes the two key two point pH calibration Any buffer has some variation of pH value with temperature but few operators take the time to measure the buffer tem perature w...

Страница 40: ...libration point values are selected they must be at least one table value apart from each other non adjacent values Table E BUFFER VALUES FOR TWO KEY TABLE METHOD pH Buffer Value Buffer Formulation 1...

Страница 41: ...ER VALUE first before entering the HI BUFFER VALUE C Press ENTER key to enter value OK flashes to confirm entry 6 Press EXAM CANCEL key to return display to pH measuring mode For best accuracy be sure...

Страница 42: ...or HI CAL VALUE and the pH and C or F indicators are both on not flashing press recessed END CAL button using a slender tool The displayed identifier and value goes off OK flashes for 5 seconds to co...

Страница 43: ...ess NEXT key until display indicates LO OUT VALUE 3 Use and keys to make display indicate the low endpoint at which 4 mA is to be provided 5 00 pH for this example NOTE Entry value must be at least 1...

Страница 44: ...extends the hold period for another 30 minutes You can cancel the output hold feature at any time by simultaneously pressing the CANCEL HOLD and OUTPUT keys SECTION 8 USING SECURITY LOCK FEATURE 8 1...

Страница 45: ...e 2 Press NEXT key until display indicates SLOPE Then press NEXT key once more to display 0000 with LOCK status indicator lit identifiers for security lock feature 3 Use and keys to make display indic...

Страница 46: ...ction The 0 100 slope reading corresponds to 0 59 2 mV pH A new sensor typically has a slope near 100 When it decreases below 80 the sensor probably requires cleaning or replacement For best slope rea...

Страница 47: ...1 68 70 1 74 30 1 68 80 1 77 40 1 69 90 1 79 4 00 Buffer Pthalate DIN 19266 C pH C pH 0 4 00 50 4 05 10 3 99 60 4 08 20 3 99 70 4 12 30 4 00 80 4 15 40 4 02 90 4 20 6 87 Buffer Phosphate DIN 19266 C...

Страница 48: ...en erator lead to RED terminal on TB2 B When Using Combination Electrode Connect generator lead to TB4 REF terminal and generator lead to TB5 ACTIVE terminal post 3 Set millivolt generator to provide...

Страница 49: ...ke display indicate mV LO CAL VALUE 7 The display should indicate 180 mV If not use and keys to make display indicate 180 mV To display minus sign press key until minus sign flashes at far left of dis...

Страница 50: ...variable returns the loop current to tracking the measured pH The output hold feature Part Three Section 7 2 can be used in conjunction with an entered simulation value For example while calibrating...

Страница 51: ...ages for circuit operation 2 The analog to digital converter section accepts signals from the pH sensor GLI 5 wire Differential Technique sensor or combination electrode and from a tempera ture sensor...

Страница 52: ...s related values pH temperature mV and 4 20 mA current out put value along with a variety of annunciators to indicate the status of the transmitter The display also indicates setup variable values err...

Страница 53: ...ay alternates between a measured value and one of the following error messages Table F SYSTEM DIAGNOSTIC ERROR MESSAGES MEANINGS Error Message Meaning Err 1 pH input is out of range pH flashes Err 2 T...

Страница 54: ...NOTE If security lock feature is in use LOCK status in dicator is lit it must be disabled at this time Use and keys to make display indicate the unlock code 1234 and then press ENTER key 3 With secur...

Страница 55: ...easurement mode the display should indi cate approximately 7 pH 4 Press DISP VAR key once to display temperature The readout should be approximately 25 C or 77 F 5 Remove jumper from green and red ter...

Страница 56: ...rr 3 message and flashing pH and C or F indicators The pH and temperature input signals are out of range pH and temperature sensors may be inoperative or both sensor cables may be shorted or open Disp...

Страница 57: ...can be reached 3 Proper return address for shipping instruments s back Include preferred shipping method UPS Federal Ex press etc if applicable 4 A purchase order if instruments s or board assemblies...

Страница 58: ...th keyboard overlay 692G1110 Door Assembly w Keyboard Overlay 1000G1181 Enclosure w Potted Terminal Board 1000G1178 Terminal Compartment Cover includes four captive fasteners and Model 692 label speci...

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