DKK-TOA NHMS-4 User manual

Please keep this instruction manual close at hand of the persons who are in charge of
the operation of this product.
Before operating this product, please read this instruction manual carefully for its
correct handling.
AMMONIUM ION MONITOR
MODEL NHMS-4
No. NHM-IB55101E

Model: NHMS-4 Introduction
- 1 -
Introduction
(a)Thank you for your purchase of Ammonium Ion Monitor Model NHMS-4. The Model NHMS-4
Ammonium Ion Monitor (hereinafter referred to as the equipment or product) can continuously
measure the ammonium ion concentration in the sample water. This product is used for water
quality management of each process, effluent monitoring, and water quality monitoring of rivers
and lakes.
(b)An abnormal measured value may be indicated or output by the following causes. Build a system
such that related facilities are not damaged.
Any problem of the product such as deterioration or damage of the detecting section or
inappropriate insulation of cables.
Improper setting of operating conditions or calibration operation.
Electrical interference such as noise in the vicinity or improper grounding.
Other unpredictable phenomena
(c)Since important items are described in “Safety Information,” read the contents carefully.
(d)The product should be handled by persons who have received proper training. In addition, for
technical services such as repairs, ask a specialist to do who is qualified for the technical
certification system in our company or a person who has technical skills equivalent to that
certification system.

Model: NHMS-4 Safety Information
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Safety Information
(1) Meaning of markings
The signal terminology and symbols related to warnings in the instruction manual are defined
below. The alert symbol mark ( : General caution mark) indicates the possibility of hazard or
damage and also means “Refer to the instruction manual.”
:
Indicates the degree of hazard which can lead to death or serious injury if you fail to operate the
product properly.
Serious injury means an injury such as loss of sight, burns (high temperature or low temperature),
electric shock, bone fracture and poisoning, and the aftereffects of the injury remains or the injury
requires hospitalization or long periods of outpatient treatment.
:
Indicates the degree of hazard/loss which can result in injury or property damage if you fail to operate
the product properly.
Injury means an injury not requiring hospitalization or long periods of outpatient treatment and refers
to burns or electric shock. Property damage refers to widespread damage to the home, household
goods and livestock, pets, equipment, materials, etc. (damage to other than the product itself).
【IMPORTANT】Indicates important matters other than and . They are the
matters such as preventing damage to the product main body, preventing data
destruction, preventing wasting time, maintaining performance, and observing
regulations.
〔NOTE〕 Indicates comments, reasons, background information, a case example and other
items to help the reader understand the meaning.
＞＞ Indicates reference items.
①, ②, ③Indicates item numbers such as the ones used in operations.

Model: NHMS-4 Safety Information
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(2) Safety compliance items
Hazardous Materials
The following solutions to be used are hazardous materials. Always check the
Material Safety Data Sheet (MSDS) and wear protective gear when handling them.
• Reagent (20 w/v% sodium hydroxide solution)
• Acid washing solution (3w/v% nitric acid solution)
• Ammonium ion standard solution (1000mg/L)
Do not mix the ammonium ion standard solution and each calibration solution with an
alkaline solution. They may react and generate ammonia gas.
Hazardous Gasses
Do not use the product in an area where explosive gas, flammable gas exists. Using
the product in any of these areas can cause explosion or fire.
Electric Shock
Do not touch the terminals inside the equipment while power is applied. Touching the
terminals may cause electric shock.
The ground terminal must be grounded. If the terminal is not grounded and a problem
occurs in the power supply system, electric shock may result.
Heavy Object
Secure this product with foundation bolts, etc. It is heavy (approximately 100kg
without the reagent) and the toppling may cause the human or physical damage.
Disassembly and Modification
Do not disassemble or modify the sections of the product that are not described in
the instruction manual. The product can be damaged.
Warning Label Lost
If any warning label affixed to this product cannot be read, please order a new one
through your local sales agent or our sales office and affix it to its original position.
(3) Notes on use of the instruction manual
Important items such as “Safety compliance items” are described in this manual. Handle the manual
as follows:
(a)The instruction manual is required not only at the start of operation but also required when
maintenance is performed or in case a failure occurs. Please keep the manual at hand all the time so
that the operator who actually operates the product can read the manual at any time.
(b)If the manual is lost or too smeared to read, please order a new copy through your local sales agent
or directly from our sales office.

Model: NHMS-4 Safety Information
- 4 -
(c)Some of the diagrams used in the manual or on product labels may be modified with part of their
shapes or displays omitted or they may be described in abstract form. In addition, numbers etc.
shown on the screen example are just examples for such cases.
(d)The contents of the manual may be changed without prior notice for reasons such as to improve
performance.
(e)Intellectual property right of the manual belongs to DKK-TOA. All or part of the manual must not
be reproduced without permission.

Model: NHMS-4 Warranty
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Warranty
(1) Warranty Coverage
DKK-TOA Corporation (DKK-TOA) warrants its products against defective material or workmanship for the warranty
period.
(a) The warranty period is one year from the date of delivery to the original user. If the date of delivery cannot be
specified, the warranty period is 24 months from the month following the date of manufacture shown on the product
nameplate.
(b) Specific written agreements with DKK-TOA, if any, shall take precedence over this warranty.
(c) The limitation of warranty described herein may not apply where applicable laws do not allow such limitation.
(2) Limited Warranty
This warranty does not cover the cases listed below.
(a) Direct or indirect failure or damage caused by the use of the product for a purpose or in a manner not prescribed by
the specifications or the instruction manual for the product.
(b) Direct or indirect failure or damage caused by force majeure, including but not limited to an act of God, natural
disaster such as earthquake, storm and flood damage, and lightning, fire, accident, abnormal voltage, salt damage,
gas damage, labor unrest, acts of war (declared or undeclared), terrorism, .civil strife, or acts of any governmental
jurisdiction.
(c) Failure or damage caused by any repair or modification not authorized by DKK-TOA.
(d) Failure or damage caused by the transport, moving, or dropping of the product after the purchase that is not
attributable to DKK-TOA.
(e) Electrodes and consumables (The warranty period for each part has priority when the period is shorter than that for
the main unit of the product. If the customer requires any part after more than six months from the date of
manufacture, consult DKK-TOA or its distributor.)
(f) Failure or damage caused by the use of consumables, parts, or software not supplied by DKK-TOA.
(g) Malfunctions or damage caused by the use of connecting equipment not supplied by DKK-TOA
(h) Loss of data, settings, programs, or software stored on the product not attributable to DKK-TOA.
(i) Any product other than DKK-TOA’s, if specified by the purchaser or user, that incorporates, or is incorporated into
or combined with DKK-TOA’s products (*1). In such cases, this warranty covers DKK-TOA’s products only.
(j) Any product not under proper maintenance in accordance with the instruction manual furnished by DKK-TOA.
(k) Products without a nameplate (excluding products proved to have been delivered by DKK-TOA).
EXCEPT AS EXPRESSLY SET FORTH IN THE PRECEDING SENTENCES, DKK-TOA MAKES NO
WARRANTY OF ANY KIND WHATSOEVER WITH RESPECT TO ANY PRODUCT. DKK-TOA EXPRESSLY
DISCLAIMS ANY WARANTY IMPLIED BY LAW, INCLUDING BUT NOT LIMITED TO ANY WARRANTY
OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.
LIMITATION OF REMEDIES: In the event that a defect is discovered within the warranty period, DKK-TOA or its
authorized distributor will, at its option, repair or replace the defective product or its part, or will refund the purchase
price of the product. THIS IS THE EXCLUSIVE REMEDY FOR ANY BREACH OF WARRANTY.
LIMITATION OF DAMAGES: IN NO EVENT SHALL DKK-TOA BE LIABLE FOR ANY INCIDENTAL OR
CONSEQUENTIAL DAMAGES OF ANY KIND FOR BREACH OF ANY WARRANTY, NEGLIGENCE, ON
THE BASIS OF STRICT LIABILITY, OR OTHERWISE.
(3) Others
(a) Maintenance parts (*2) for product will normally be supplied for five years (*3) from the date manufacturing and
sales are discontinued.
(b) The cause of any malfunction or damage shall be determined by a DKK-TOA technician.
(c) For repairs, contact a local distributor in your country or state.
*1: Warranties for products from other companies must be maintained by the user.
*2: Maintenance parts refers to parts that are required to maintain operation of the product.
*3: This five-year period is subject to availability of parts or their replacement.

Model: NHMS-4 Reading Guide
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Reading Guide
Refer to the necessary sections of this instruction manual depending on your purposes such as
understanding the outline of this product or starting the product as shown below. The numbers in
circles indicate sections to be referred to in sequential order.
●Safety Information
Set up and
perform the
test run and
adjustment
Understand
the outline of
this product
Check
installation,
piping and
wiring
Purpose
Section
Perform
respective
settings or
operation test
Maintain and
check or
handle error
or alarm
1 1
●Introduction
1 1 12
23
1. Configuration and Part
Names
4
2. Preparation for
Operation
5
3. Test Run and
Adjustment
10. Communication
Functions
4
9. Installation
3
8. Specifications and
Operational Explanation
3
7. Additional Functions
2
6. Troubleshooting
3
5. Maintenance
2
4. Modes of Operations
2

Model: NHMS-4 Table of Contents
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Table of Contents
●Introduction······················································································· 1
●Safety Information ········································································· 2
(1) Meaning of markings  2
(2) Safety compliance items  3
(3) Notes on use of the instruction manual  3
●Warranty ···························································································· 5
●Reading Guide ················································································ 6
1. Configuration and Part Names·············································12
1.1 Configuration Example and Specifications Check·····································12
1.2 Name of Each Part············································································14
1.3 Operation Panel ···············································································16
1.4 Operation Screens Map ·····································································17
2. Preparation for Operation·······················································18
2.1 Ion Electrode Installation ····································································18
2.2 Solution Preparation and Filling ···························································21
(1) Solution type  21
(2) Filling of reagent (sodium hydroxide solution)  21
(3-1) Filling of acid washing solution  22
(3-2) Preparing the acid washing solution  23
(4-1) Calibration solution key points  23
(4-2) Preparation and filling of HI calibration solution  24
(4-3) Preparation and filling of LO calibration solution  26
(4-4) Preparation of LL calibration solution  27
(4-5) Preparing the ammonium ion standard solution  28
3. Operation ······················································································29
3.1 Test Run and Adjustment Procedure ·····················································29
3.2 Operation Method Selection ································································35
(1) Starting method selection  35
(2) Continuous/intermittent measurement selection  35
3.3 Calibration Method Selection·······························································37
(1) Times when the calibration is necessary  37
(2) Calibration method classification  37
(3) Automatic calibration setting  39
(4) ACAS calibration function  40
3.4 External Input/output and Loop Check ···················································43

Model: NHMS-4 Table of Contents
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(1) External input/output list  43
(2) External contacts output and loop check  45
(3) External start and loop check  45
(4) Transmission output and loop check  46
(5) Digital input/output and loop check  46
3.5 Operation Stop·················································································47
(1) Short-term stop  47
(2) Long-term stop  47
4. Modes of Operations································································52
4.1 Measurement Screen Operation···························································52
(1) Measurement screen functions  52
(2) Automatic measurement start  57
(3) Automatic measurement stop  58
(4) Key lock switching  59
(5) Alarm check and clear  60
(6) “Maintenance in progress” signal switching  62
(7) Liquid level check of tanks by monitor  64
(8) USB memory removal  65
(9) Switching to internal start from external start and communication start  67
(10) Parameters check  68
4.2 Data Screen Operation ······································································71
(1) Data screen functions  71
(2) Measured value log check and initialize  72
(3) Batch writing to USB memory  76
(4) Calibration log check and initialize  79
(5) Operation log check and initialize  81
(6) Alarm log check and initialize  84
4.3 Parameter Screen Operation·······························································88
(1) Parameter screen functions  88
(2) Parameters list  90
(3) Date and time setting  91
(4) Next calibration time change  92
(5) Calibration interval change  94
(6) Next wash time change  95
(7) Wash interval change  97
(8) Intermittent measurement start time change  98
(9) Intermittent measurement interval change  100
(10) Stability wait time change  101
(11) Response speed change  102
(12) Version screen check  103
(13) Continuous measurement and intermittent measurement switching  104
(14) Start method switching  106
(15) Calibration mode switching  107

Model: NHMS-4 Table of Contents
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(16) Calibration order check  109
(17) Device address change  109
(18) Security set and clear  111
(19) Reagent flow check  114
(20) Alarm value change  115
(21) Dead zone change  117
(22) Sample water off alarm transmission switching  118
(23) Temperature compensation switching  120
(24) Temperature control temperature change  121
(25) Sample water flow check  122
(26) Calibration solution concentration change  123
(27) Concentration arithmetic expression check and change  125
(28) Correction coefficient change  127
(29) Transmission output range check and change  130
(30) Transmission mode switching  132
(31) Dummy transmission value change  134
4.4 Maintenance Screen Operation·························································· 136
(1) Maintenance screen functions  136
(2) Manual wash start  137
(3-1) Calibration screen functions  138
(3-2) Automatic reading calibration  140
(3-3) Manual reading calibration  141
(3-4) Manual correcting calibration  143
(4) Manual measurement  147
(5) Individual operation  150
(6) External contact output check  152
(7) Transmission output check  155
(8) Check by input monitor  157
5. Maintenance ·············································································· 160
5.1 Maintenance Items List ···································································· 160
5.2 Accessories and Spare Parts····························································· 163
(1) Standard accessories  163
(2) Spare parts  164
5.3 Operation before and after Maintenance ·············································· 168
(1) Operation before maintenance  168
(2) Operation after maintenance  169
5.4 Sampling Route and Pre-treatment Tank Maintenance ···························· 170
(1) Sampling route inspection  170
(2) Pre-treatment tank cleaning and parts replacement  170
5.5 Solution Addition and Replacement ···················································· 172
5.6 Solenoid Valve Maintenance ····························································· 174
5.7 Pump Tube Replacement ································································· 176
5.8 Measuring Cell Maintenance ····························································· 179

Model: NHMS-4 Table of Contents
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(1-1) Measurement stop and ion electrode removal  179
(1-2) Ion electrode assembling and measurement restart  180
(2) Measuring cell cleaning  181
(3) Membrane and internal solution replacement  182
(4) Ion electrode replacement  183
(5) Stirring motor replacement  184
(6) Stirring bar and rubber cap replacement  186
5.9 Mixing Chamber Maintenance ··························································· 188
(1) Mixing chamber cleaning  188
(2) Mixing chamber parts replacement  189
5.10 Thermostatic Chamber Tube Replacement ··········································· 190
6. Troubleshooting········································································ 194
6.1 Alarm Items and Transmission··························································· 194
(1) Alarm types and transmission method  194
(2) Analyzer failures  194
(3) Measured value error  197
(4) Power off alarm  197
6.2 Alarm Handling for Items ·································································· 199
6.3 Troubleshooting ············································································· 201
(1) Sample water is not fed  201
(2) Reagent is not fed  202
(3) Measured value is abnormal  203
7. Additional Functions ······························································· 204
7.1 Air Cleaning ·················································································· 204
(1) Air cleaning function  204
(2) Air pump maintenance  204
(3) Sample water filter with air cleaning function  205
7.2 Waste Solution Recovery ································································· 206
(1) Recovery function and connection by waste solution tank  206
(2) Waste solution tank maintenance  206
7.3 Leak Detection··············································································· 209
(1) Leak detection function  209
(2) Reset processing after leak generation  209
7.4 Other Added Functions ···································································· 211
(1) Recorder  211
(2) Low concentration calibration  211
(3) Junction box  211
8. Specifications and Operational Explanation················· 213
8.1 Specifications ················································································ 213
8.2 Operational Explanation ··································································· 216
(1) Measuring principle  216

Model: NHMS-4 Table of Contents
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(2) Flow sheet  217
(3) Time chart  218
9. Installation··················································································· 225
9.1 Installation Example ········································································ 225
9.2 Installation Conditions ····································································· 227
(1) Sample water sampling point conditions  227
(2) Installation site conditions  227
9.3 Installation ···················································································· 228
9.4 Piping ·························································································· 230
(1) Piping port specifications  230
(2) Sampling pump installation essentials 231
9.5 Wiring ·························································································· 232
(1) External connection terminals  232
(2) Junction box wiring  233
(3) AC power input terminal wiring  233
(4) Ground wiring  234
(5) Input/output wiring  234
10. Communication Functions ··················································· 235
10.1 Overview of Communication Functions ················································ 235
(1) Main functions  235
(2) Communication specifications and others  236
10.2 Command Function Details ······························································· 237
(1) Set value read  237
(2) Set value write  237
(3) Self-check  238
(4) Contiguous data write  239
(5) Exception function response  240
10.3 Registers ······················································································ 241
(1) Registered that can be referenced  241
(2) Registers that can be referenced and executed  241
(Last page  245)

Model: NHMS-4 1.1 Configuration Example and Specifications Check
- 12 -
1. Configuration and Part Names
1.1 Configuration Example and Specifications Check
Ion monitor Waste solution tank
(option)
Pump
Configuration Example of Ammonium Ion Automatic Measurement
(a)This equipment can quantify the ammonium ion concentration by adding a reagent (sodium
hydroxide solution) to the sample and measuring the electric potential with an ammonium ion
electrode (hereinafter referred to as “ion electrode”) as the indicating electrode.
(b)Main specifications  The range 0.05 to 100.0 mg/L can be measured. The measuring range
specified when ordering is set and the transmission output range is also set to the specified
measuring range. Check the delivery specifications for the measuring range of each equipment.
The main specifications are shown in the table below.
Main Specifications
Specifications item Contents
Measuring object Concentration of ammonium ion contained within effluent, river water, and
lake water
Measurement system Ammonium ion electrode method (alkali solution mixed system)
Measuring range
(Specified when ordering,
Cannot be changed)
0.05 to 5.00 mg/L (Standard)
0.10 to 10.00 mg/L
1.0 to 100.0 mg/L
Measurement interval Continuous or intermittent measurement (shortest interval 1 hour)
Flow path 1
(c)Reagent  The ammonium ion electrode method adjusts the pH of the sample water to 12 or
more by adding a reagent (sodium hydroxide solution) to change the ammonium ion into ammonia.
Furthermore, this method quantifies the ammonium ion concentration by measuring the electric
potential of this solution with ion electrode as the indicating electrode.
(d)Features and essential points  The features and essential points in handling the equipment are
as follows:
• Starting method  1 method can be selected from among the followings:
Internal start  Operation by built-in timer
External start  Starting by other external contact signals.

Model: NHMS-4 1.1 Configuration Example and Specifications Check
- 13 -
Communication start  Operation by communication function (RS-485). Operation is almost the
same as external starting.
• Continuous measurement and intermittent measurement  1 method can be selected from
among the followings:
Intermittent measurement  The equipment performs the measurement operation of 1 unit
(approximately 20 minutes) at each intermittent measurement period (1 to 99 hours) and updates
the held value according to the obtained measured value.
Continuous measurement  The equipment performs the measurement continuously until
measurement stop operation is performed.
• Calibration mode 1 method can be selected from among the followings:
Normal calibration  Normal calibration by calibration interval
ACAS calibration  ACAS (Automatic Calibration cycle Adapting System) is a function that
monitors a drop in performance of the ion electrode and automatically resets the equipment so
that automatic cleaning and automatic calibration are performed at a suitable interval.
• USB memory  Measured values, calibration data, and other information can be written to
USB memory from the equipment and processed by PC, etc.
• Digital I/O port  When communication start is selected, the measured value, calibration
history, error generation history, etc. can be called and remote maintenance of measurement
command, calibration command, cleaning command, etc. can be performed by communication
function (RS-485).
• Contact output signal  There are power off, failure 1 (serious), failure 2 (minor),
concentration higher limit alarm, concentration high limit alarm, concentration lower limit alarm,
calibration in progress, cleaning in progress, under maintenance, and measurement in progress
external contact signals.
(e) Additional functions  The additional functions (options) shown in the table below can be added
by order specification. ＞＞ 7. “Additional Functions”
Additional Functions
Functions Contents
Air cleaning Cleaning of sample water line and filter by reverse air flow
Waste solution recovery Function that recovers the calibration solution to a waste solution tank
Leak sensing A receiving tray with leak sensor is added.
Recorder 1 pen system, 100 mm wide chart
Low concentration
calibration
Low concentration region concentration arithmetic expression is added by LL
calibration, and 3-point calibration is available.
Junction box Contacts capable of using 100VAC are built in.
(f) Countermeasures against sample water with many turbid components  An acid cleaning
function is provided as standard, but when measuring sample water that is dirty or has many turbid
components, combined use with a sand filter, etc. is recommended. In this case, the piping from the
sampling position to the equipment must be also periodically blow cleaned.

Model: NHMS-4 1.2 Name of Each Part
- 14 -
1.2 Name of Each Part
Power switch
(earth leakage breaker)
Recorder (option)
Power lamp
Operation panel
(controller)
USB interface
USB memory
Detector section
IO box
LO calibration solution tank
HI calibration solution tank
Reagent tank
(sodium hydroxide)
Acid washing tank
Reagent pump
Sample water pump
Mixing chamber
Air pump
(option – specification
with air cleaning)
Pre-treatment tank
<Appearance>
Name of Main Parts on the Front

Model: NHMS-4 1.2 Name of Each Part
- 15 -
Pre-treatment tank outlet
Sample water inlet
Pan outlet
Wash water inlet
Piping port (option)
External connection
terminals
Waste solution tank outlet
(option)
Measurement cell outlet
Name of Main Parts on the Right Side

Model: NHMS-4 1.3 Operation Panel
- 16 -
1.3 Operation Panel
(a)Operation panel function outline  The operation panel is a graphic type touch panel. Screen
switching and parameters settings, which are the operation conditions, can be changed by touching
the operation key according to the purpose such as automatic operation, maintenance, etc.
(b)Home screen  When the power switch (breaker) is set to “ON”, the “Measurement screen
(MEAS STOP)”, which is the home screen, is displayed. In the case of external start or
communication start, some of the screens are different. For a detailed description of the screens,
see 4. “Modes of Operations”.
(c)Automatic turn-off  If the equipment is not operated for about 60 minutes, the screen is turned
off by the automatic screen turn-off function. If you touch the screen turned-off by that function, it
appears again.
START/STOP ｋey
USB key
MAINT key
PARAMETER key
DATA key
MONITOR key
Detailed display
MAINT OUT ｋey
DATE/TIME display
ALARM keyKEY LOCK key
MEAS VAL display
KEY LOCK ALARM MAINT OUT
DATA PARAMETER MONITOR
2012/02/08 10:31
[MEAS STOP]
ANMONIUM
-----
mg/L
STATUS ｰｰｰｰｰｰｰｰ
WAIT
PROCESS
MANUAL CORRECT
REMAINED TIME
POTENTIAL
CELL TEMP
SENSITIVITY
USB
MAINT
55. 2
25. 0
OFF
0
91
mV
℃
sec
％
START
/STOP
Measurement Screen (MEAS STOP)
KEY LOCK ALARM MAINT OUT
DATA PARAMETER MONITOR
2012/02/08 10:31
[MEAS]
ANMONIUM
mg/L
STATUS
Prepration
SAMPLE SEND
PROCESS
MANUAL CORRECT
REMAINED TIME
POTENTIAL
CELL TEMP
SENSITIVITY
USB
55. 2
25. 0
OFF
2
91
mV
℃
sec
％
0. 15
01
START
/STOP
Measurement Screen (MEAS)

Model: NHMS-4 1.4 Operation Screens Map
- 17 -
1.4 Operation Screens Map
INPUT MONITOR
TRANS OUT CHECK
INDIV OPE
WASH
MANU MEAS
EX CONTACT OUT
＞＞ 4.4 "Maintenance Screen Operation"
CAL
"WASH"screen
LL CAL MEAS*
LO CAL MEAS
HI CAL MEAS
"LL CAL MEAS"screen*
"LO CAL MEAS"screen
"HI CAL MEAS" screen
LL CAL SEND*
LO CAL SEND
HI CAL SEND
ACID WASH SEND
SAMPLE SEND
REAGENT SEND
"ＥX CONTACT OUT"screen
"TRANS OUTＰＵＴ CHECK"screen
"INPUT MONITOR"screen
DRAIN
STABILITY WAIT TIME
NT MEAS INTEVAL
WASH INTERVAL
DATE/TIME SET
CAL INTERVAL
INT MEAS START TIME
NEXT CAL TIME
RESPONSE SPEED
NEXT WASH TIME
Y M D H12 01 01 00
Y M D H
12 01 01 00
7D
8Ｈ
12 01 01 00
1Ｈ
10 M
Normal
PARAMETER2
SECURITY
CAL ORDER
REGENT FLOW
CAL MODE
DEVICE ADDRESS
CON/INT MEAS SWITCH
IN/OUT START SWITCH
TEMP COMP
DEAD ZONE
SAMPLE OFF ALARM
HIGHER ALARM
HIGH ALARM
LOW ALARM
CONTROLLER TEMP
SAMPLE FLOW
LL SLOPE*
LO
LL CAL CONCENT
LO CAL CONCENT
HI CAL CONCENT
SLOPE
CORRECT a(y=a+bx)
CORRECT b(y=a+bx)
DUMMY TRANS VALUE
TRANS ZERO
TRANS SPAN
TRANS MODE
＞＞ 4.3 "Parameter Screen Operation"
MEAS VAL
LOG
OPE LOG
CAL LOG
"OPE LOG" screen
LOG INITIAL
"CAL LOG" screen
ALARM LOG
LOG INITIAL
"ALARM LOG" screen
LOG INITIAL
LOG INITIAL
USB WRITE
GRA DISPLAY
READ
"MEAS GRAPH"
screen
"USB WRITE"
screen
Switches to the set
date/time log.
MONTOR
START
/STOP
DATA
KEY LOCK
MAINT OUT
ALARM
"Key lock set(or clear)" dialog box
"Alarm" dialog box
"Maintenance in progress signal
output start(or Clear)" dialog box
"Monitor" dialog box
(Float switch status)
ＵＳＢ
"CF/USB REMOVAL" screen
USB REMOVAL
MAINT
PARAMETER
START
/STOP
(Power ON)
"Automatic
measurement
start" dialog box
Yes
Automatic
measurement
stop dialog box
Yes
＞＞ 4.1 "Measurement Screen Operation"
VER.DISPLAY
"DATE/TIME SET"dialog box
"VERSION"screen
PARAMETER
The same function as
the key of "MEAS
(MEAS STOP)screen"
is available. Setting
can be also changed.
etc.
The numbers are
changed depending on
numerical keypad dialog.
: Change over the page.
"END"/"MEAS screen": Return to "MEAS(MEAS STOP) screen " or "MEAS(UNDER MEAS) screen ""RETURN": Return to the previous screen
"ALARM": Opens "Alarm dialog box" "MAINT OUT" : Opens "Maintenance in progress signal output (or Clear) dialog" "DATA": Displays "Data screen"
"PARAMETER" has the same function as "MEAS(MEAS
STOP)" screen. However, setting cannot be changed.
・
"KEY LOCK", "ALARM", "MAINT OUT", "MONITOR" and "USB" have
the same function as "MEAS(MEAS STOP)" screen.
・
"USB WRITE" is not in "DATA" of "MEAS VAL LOG"screen.
・
(Touch for 1 second or more)
AUTO LL CAL*
AUTO LO.HI CAL
MANU LL CAL*
MANU LO CAL
MANU HI CAL
MANUAL CORRECT CAL
"AUTO READ LL CAL"screen*
"AUTO READ LO.HI CAL"screen*
"MANU READ LL CAL"screen*
"MANU READ LO CAL"screen*
"MANU READ HI CAL"screen*
"MANUAL CORRECT
CAL"screen
* ：option
＞＞ 4.2 "Data Screen Operation"
"MEAS（MEAS STOP）"
screen
"MEAS
（
MEAS
）"
screen
"DATA" screen
"MEAS VAL
LOG" screen
"PARAMETER 1 SET" screen
"PARAMETER 2 SET" screen
Y M D H
"MAINT" screen
"CＡＬ"screen (Manual)
"
MANU MEAS
"
screen
"ＩＮＤＩＶ ＯＰＥ"
screen
Operation Screens Map

Model: NHMS-4 2.1 Ion Electrode Installation
- 18 -
2. Preparation for Operation
This chapter explains the operations that are performed before power is supplied to the equipment. If
power is being supplied to the equipment, turn off the power at the supply source.
2.1 Ion Electrode Installation
Detector terminal blocks
(enlarged)
12345A
1
B
1
B
2
A
2
Detector section cover
Butterfly bolt
<Top of the equipment>
(Not used)
Ion electrode
Cell temperature electrode
Solution ground
electrode
Vent tube
Thermostatic chamber tube
Solution ground
electrode lead wire
Cell temperature
electrode lead wire
Ion electrode
Ion electrode
lead wire
Electrode holder
Knurled screw
Thermostatic
chamber tube
(φ2×3)
(measuring cell side)
Water leakage
drain port
Measuring cell outlet tube
Measuring cell overflow tube
Temperature control
aluminum block
Machine screws (2 pcs)
fixing the measuring cell
Measuring cell
Connector
Heat insulating
material
(φ2×3) (mixing tank side)
Detector Section
Ion electrode is not assembled to the equipment at the factory. Assemble the accessory ion electrode
to the measuring cell as follows.
①Remove the detector section cover.  Loosen the butterfly bolts (4) and remove the
detector section cover.
②Remove the electrode holder.  Loosen the knurled screws (2) and remove the electrode
holder from the measuring cell.
【IMPORTANT】At this time, be careful that the packing spacer and ammonia rubber cap
assembled at the top of the cell and the knurled screws do not get lost.
③Remove the sealing tape, etc.  Remove the accessory ion electrode from the carton, and
remove the sealing tape and protective cap from the ion electrode. As the protective cap will be
reinstalled when storing the ion electrode, store it.

Model: NHMS-4 2.1 Ion Electrode Installation
- 19 -
【IMPORTANT】Do not touch the membrane at the ion electrode end with your hands. If
the membrane is dirty or damaged, membrane and the internal solution
must be replaced.
If the membrane is scratched or otherwise abnormal, replace the
membrane and internal solution before installing the ion electrode.
＞＞ 5.8(3) “Membrane and internal solution replacement”
If measurements are started with the sealing tape not removed from the
ion electrode and assembled, the indication may be unstable
Do not get the end of the ion electrode lead wires wet or dirty. If the end
of the lead wires is wet or dirty, clean it with alcohol and dry it.
Measuring cell
Solution ground electrode
(Model EL2066BF)
Temperature electrode assembly
(No. 7301260K)
Protection cap
(Installed when storing)
Ion electrode
(Model ELX009)
Electrode holder
Knurled screw
Packing spacer
(No. 73022500)
Ammonia rubber cap
(No. 73022600)
Pressure balance hole
Sealing tape
Ion electrode lead wire
(Removed when assembling)
Installing and Removing the Electrode
④Install the ion electrode.  After checking that there is a packing spacer and ammonia rubber
cap at the top of the measuring cell, carefully insert the ion electrode into the measuring cell and
secure it with the electrode holder and knurled screws (2 pcs).
⑤Connect the lead wire.  Connect the lead wire of the ion electrode to the terminal (1, 2, and
4) at the inside top of the detector section by matching the wire mark numbers.
[Wired terminals]
Terminal 3  (Not used) Terminal B1 Cell temperature
Terminal 5  Solution ground Terminal A2 Controller temperature
Terminal A1 Cell temperature Terminal B2 Controller temperature