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1. Outline 

Before carrying out the inspection, repair or maintenance of the mercury analyzer WA-

5A, be sure to refer to this service manual. 

 

 

1.1 Outline 

The Mercury WA-5A is a mercury analyzer that enables the rapid measurement of the 

quantity of mercury collected in a dedicated mercury collector tube in easy operations 

with high sensitivity over a wide range. 

A personal computer is used for operations and the processing of measurement results, 

and it is possible to make various analyses such as statistical calculations. 

 

 

1.2 Basic configuration of this instrument 

This instrument consists of the following units: 

(1) 

Mercury analyzer :WA-5A 

(2) 

Data analysis/instrument control software :WA5Win 

(3) 

Standard accessories 

(4) 

Personal computer 

 

 

 

Summary of Contents for WA-5A

Page 1: ...No NIC 704 2013 01 Date of Issue Mar 9 2015 Management Dept Technical Center Page 1 WA 5A Service Manual Nippon Instruments Corporation Technical Center Date Written By Checked By Approved By 1st edit...

Page 2: ...History Ver Revision Date Reason for Revision Written By Approved By 01 Mar 9 2015 First edition issued Inoue Noda Distribution List Distributed To Distribution Date Distributed To Distribution Date D...

Page 3: ...ings and explanations of symbols 11 2 2 Cautions concerning installation 11 2 3 Cautions concerning maintenance 11 3 MAINTENANCE 12 3 1 Inspection items 12 3 1 1 Daily inspection 12 3 1 2 Yearly inspe...

Page 4: ...6 4 1 Collector tube adapter 26 4 2 Heater H1 26 4 3 Heater H2 28 4 4 Gas washing bottle and dehumidifying bottle 28 4 5 Cell 28 4 6 Optical system unit 29 4 7 Mercury lamp 30 4 8 Phototube preamplifi...

Page 5: ...a dedicated mercury collector tube in easy operations with high sensitivity over a wide range A personal computer is used for operations and the processing of measurement results and it is possible to...

Page 6: ...ing furnace H1 With built in air cooling fan 3 Collector tube fixing port Made of fluoroplastic 4 Electronic cooler unit 5 Gas washing bottle Removes acid gas At time of atmosphere measurement pH 6 86...

Page 7: ...A or 250 V 5 A 5 AC OUT Power port for sample changer Interlocked with main switch 6 Personal computer connection port Connected using LAN cable 7 Serial connection port Not used 8 Dry gas meter conne...

Page 8: ...1 3 3 Inside of top cover No Name Remark 1 Optical system unit 2 Absorption cell 200 mm For low range measurement 3 Absorption cell 1 mm For high range measurement 4 Low pressure mercury lamp 1 2 3 4...

Page 9: ...2 bypass at time of H1 direct sampling such as that for LPG 5 Air pump 6 Flow adjustment needle Adjust to 0 5 L min 7 Flow sensor For flow measurement 8 Activated carbon for carrier gas For carrier ga...

Page 10: ...or optical system 5 Power supply board for electronic cooling 6 Power supply board for main board 1 4 Readers for whom this service manual is intended This manual is for technicians who have received...

Page 11: ...power cord and plug and make sure whether there is any damage or not 2 3 Cautions concerning maintenance Cut off the power supply before starting maintenance work or you may get an electric shock Tur...

Page 12: ...countdown Checking at time of measurement Item Standard Measures against abnormality Blank value When purge measurements are made repeatedly the HEIGHT value on the LOW side shall be 0 0002 or less C...

Page 13: ...cleaning or pump replacement Detector output Ref Shall be 4 0 5 V on the maintenance screen of WA5Win Wiping of dirt on lamp lens etc Adjustment of optical system Detector output Sig1 Sig2 Shall be 4...

Page 14: ...2 LAMP BROKEN The light quantity of the lamp REF voltage decreases below the preset value Issued if the REF voltage is 0 5 V or less Possible causes are the deterioration of the lamp and an abnormalit...

Page 15: ...10 HEATER BROKEN H2 The temperature of H2 does not rise Issued if the temperature of the H2 is not 400 C or more at the end of a measurement If the error reoccurs after the instrument is turned off an...

Page 16: ...t us 15 TC WA NO SAMPLE The measured collector tube does not move down Issued if the measured collector tube does not descend Turn off the power open the front cover and check the inside If the error...

Page 17: ...n the cover and retighten the Teflon joint Dirty or deteriorated piping Dirty collector tube scrubbing liquid joint By injecting standard gas into various parts of the piping route the faulty part can...

Page 18: ...n for a filter or a mercury collector tube to various parts of the piping route using Tygon tubes or the like and make measurements When standard gas is collected a mercury grain may adhere to the syr...

Page 19: ...roximately zero When the flow rate does not decrease there is a leak because of the deterioration of the septum a loosened joint or the like After the checking of a leak shift the plugging finger slow...

Page 20: ...bottle and dehumidifying bottle 1 Open the front cover 2 Remove the collector tube and the screws fixing the collector tube connection port 3 Remove the transparent board of the electronic cooler 4 R...

Page 21: ...llector tube H2 Remove the cover of the instrument Remove the reducing Teflon joint FLW 30 6RU4 S and pull the collector tube out of the H2 To attach the joint tighten it lightly by hand and then reti...

Page 22: ...s 1 Cell window retainer 2 O ring P9 3 Cell window 4 Cell window holder 5 O ring P10 6 Washer 7 Cap nut To remove the cell window retainer use a coin If it is impossible to remove the cell window clea...

Page 23: ...e without the collection agent and the joint in a plastic beaker or a glass beaker Pour neutral detergent and clean the components using an ultrasonic cleaner or by keeping them in the detergent for 3...

Page 24: ...odium calcium or the like adheres to them When the temperature in the electric furnace has lowered and it is possible to take out the quartz tubes take them out using a flat trowel tongs or the like w...

Page 25: ...The Optical Adjust screen starts and it is possible to make the gain adjustments for SIG1 SIG2 and REF Adjust ZERO to 0 V and SPAN to 4 V When AUTO is clicked a span adjustment and a zero adjustment f...

Page 26: ...ried out smoothly 4 1 Collector tube adapter 1 Remove the collector tube and the reducing elbows of the gas washing bottle and dehumidifying bottle 2 Remove the screws of the retainer fixing the colle...

Page 27: ...crews to remove the lid 3 Loosen the four screws fixing the glass tube reflector and pipe holder Then loosen the two screws fixing the thermocouple and the two nuts fixing the heater 4 Remove the refl...

Page 28: ...ple make sure that its end touches the heater 4 4 Gas washing bottle and dehumidifying bottle For the removal and fixing procedures for the gas washing bottle and dehumidifying bottle refer to 3 4 3 C...

Page 29: ...tion board and the main board and the connectors of the constant temperature cap and mercury lamp from the power supply board for the optical system 2 Remove the Teflon joints on the 1 mm cell side an...

Page 30: ...cal system box and remove the lamp unit cover assembly 2 Disconnect the connectors of the constant temperature cap and mercury lamp from the power supply board for the optical system 3 Loosen the two...

Page 31: ...amp to the constant temperature cap 5 When replacing the lamp fix a new lamp such that its front is aligned with the direction of the hole in the constant temperature cap 6 After the replacement is co...

Page 32: ...crews fixing the preamplifier board and replace it 2 After the replacement is completed readjust the optical system 4 9 Second collector tube For the removal and fixing procedures for the second colle...

Page 33: ...tching of sampling route and detection route 2 Valve V2 Switching of detection route and bypass route 3 Valve VA H2 bypass at time of H1 direct sampling such as that for LPG 4 Valve EV Switching for o...

Page 34: ...out the connector attached to the flow sensor Then loosen the two screws and remove the flow sensor 4 12 Air pump Loosen the three M3 10 hexagon socket head cap screws of the pump plate fixing the air...

Page 35: ...tor s connected to each control board loosen the screw s fixing the board and remove it No Name Remark 1 Main board 2 Power supply board for main board 3 Power supply board for optical system 4 Power...

Page 36: ...main board and the connectors of the constant temperature cap and mercury lamp from the power supply board for the optical system 2 Remove the Teflon joints on the 1 mm cell side and 200 mm cell side...

Page 37: ...d to the switching power supply to be replaced 6 Lay the main unit on its side insert a screwdriver through the slits in the baseplate loosen the screws and take out the switching power supply Attach...

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