JENCO 6173 User manual

OPERATION MANUAL
JENCO MODEL 6173
MICROCOMPUTER BASED
pH/mV/Temperature
BENCH METER
JENCO INSTRUMENTS, INC. JENCO ELECTRONICS, LTD.
7968 ARJONS DR., SUITE C P.O. BOX LINKOU-117
SAN DIEGO, CA 92126 TAIPEI HSIEN, TAIWAN,R.O.C.
TEL: [phone] TEL: [phone]
FAX: [phone] FAX: [phone]
E-Mail:[email protected] E-Mail:[email protected]
SHANGHAI JENCO ELECTRONICS, LTD.
18 WANGDONG ZHONG ROAD,SIJING,
SONGJING,SHANGHAI,CHINA,20160
TEL: [phone]
FAX: [phone]
E-Mail:[email protected]
WEBSITE : http://www.jenco.com.cn

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INITIAL INSPECTION
Carefully unpack the instrument and accessories. Inspect for
damages made in shipment. If any damage is found, notify
your Jenco representative immediately. All packing materials
should be saved until satisfactory operation is confirmed.
GENERAL INTRODUCTION
The model 6173 is a precise instrument for the measurement
of pH, mV and temperature. A built-in microcomputer is used
to store, calculate and compensate for all the relevant
parameters relating to pH determinations. These include
temperature characteristics of the pH electrode, buffer
solutions and electrode slope deviations.
The mechanical touch keys are highly reliable with tactile
and audio feedback. This meter can operated with six 1.5V
batteries. Re-calibration is not required when power is
turned on again.
The meter has a large LCD that displays the pH (mV) and
temperature simultaneously along with the user-prompting
mode indication annunciators. The instrument prompts the
user through the calibration and measurement procedures.
An AUTOLOCK feature is provided for both pH and mV
measurements. This enables the instrument to automatically
sense the end point and "lock" the reading to indicate the
end point value of a measurement. The 6173 can also be used
in the non-AUTOLOCK mode.
The AUTOLOCK and the user prompting features help eliminate
most of the errors in the determination of pH and mV values.

The model 6173 uses pH and ORP electrodes with BNC
connectors and interchangeable ATC ( Automatic Temperature
Compensation ) / Temperature probes.
Other features include electrode offset recognition,
electrode slope recognition, electrode efficiency display,
built in buffer coefficients, automatic or manual
temperature compensation.
BATTERIES REPLACEMENT
F
ollow the procedures to replace the internal batteries.
1. Replace batteries when the BAT indicator appears on the
LCD . The instrument can operate within specifications
for approximately one hour after BAT starts to appear.
2. The battery compartment is located at the bottom side of
the meter (Refer to Figure 1). Flip the meter over so
that the bottom side is facing up. Lift the battery cover
to expose the battery compartment.
3. Replace all six type AA batteries.
4. Replace battery cover.
.
Figure 1
3

TURNING ON/OFF THE INSTRUMENT
When the instrument is not in use, press the ON/OFF key to
turn off the instrument. Unplugging the AC adaptor from the
instrument or from the AC line does not turn off the
instrument. It would automatically switch to the internal
batteries. The instrument will continue to operate on the
internal batteries.
ABOUT LCD DISPLAY
Figure2
1.AUTOLOCK ：In the autolock mode。
2.BAT. ：Low battery indicator。
3.HOLD ：Input is locked
4.WAIT ：Waiting to lock。
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5.mV ：mV unit。
6.pH ：pH unit。
7.UNIT ：Unit indicator。
8.ATC ：ATC mode indicator。
9.MAN ：MANUAL mode indicator。
10.EFFICIENCY：Efficiency of electrode。
11.SLOPE ：Calibration indicator
12.STAND ：Calibration indicator
13. 14.00 ：Main LCD display
14.% ：Efficiency unit
15.25.0 ：Second LCD display
16.℃ ：Temperature unit
KEY FUNCTIONS OF THE MODEL 6173
Figure3
1. [MODE] key : The [MODE] key selects the parameters to be
displayed. Pressing the [MODE] key changes the
display sequentially to display : pH-AUTOLOCK ,
mV-AUTOLOCK , pH and mV. The calibration values
will not be affected by changing the display
modes.
5

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2.&3. [STAND] and [SLOPE] keys：The [STAND] and [SLOPE] keys
are used for dual point pH calibration of the
instrument.
Pressing and holding the [STAND] key while
turning on the power ,will chang the buffer set
to the other available buffer set.
4.[MEA./EFF.] key ：a. The [MEA./EFF.] key is used to bring
the instrument out of the AUTOLOCK condition
when operating in the pH-AUTOLOCK or mV-AUTOLOCK
mode.
b. Press and hold this key for 5 seconds, the
large LCD will display the efficiency of the
electrode.
5.&6. The [ ∆ ] and [ ∇ ] keys ：The [ ∆ ] and [ ∇ ] keys
are used to manually enter the temperature
values. They have no effect on the instrument
when operating in ATC mode.
7. [CLEAR] key ： The [CLEAR] key is used to clear all
calibration values stored in the internal
memory. Under normal use the key will not be
activated unless pressed and held for 2 seconds.
8.[ON/OFF] key ：The [ON/OFF] key turns the instrument on or
off. The pH calibration values will not be
erased when the instrument is turned off.

CONNECTOR
Figure 4
1.RS-232 connector 2. AC adaptor input connector
3.ATC connector 4. Ref. Input connector
5.pH/ORP connector
OPERATIONAL PROCEDURES
BUFFER TABLE SELECT
There are two sets of buffer available for this unit :
4.01,7.00, 10.01pH and 4.00,6.86, 9.18pH.
You can change the buffer set by turning off the unit then
press and hold the [STAND] key as you turn on the unit
again.
pH CALIBRATION
Turn on the instrument by pressing the [ON/OFF] key. When
turn on, the display maintains at the same mode before shut
down.
7

8
1. Calibration with an ATC/Temp probe in the pH-AUTOLOCK
mode.
1.1 Connect the pH electrode to the BNC connector and the
ATC/Temp probe to the ATC/Temp connector of the
instrument. The ATC annunciator on the LCD will be on.
Press the [MODE] key if necessary to go to pH-AUTOLOCK
mode.
1.2 Rinse the pH electrode and ATC/Temp probe in distilled
water and immerse them in pH buffer 7.00(6.86). The
instrument will display the buffer temperature.
1.3 Press the [STAND] key. The STAND annunciator will be
on and the WAIT annunciator will flash. At this time
the instrument is waiting for a stable reading. The
display will be locked to the buffer value
corresponding to the temperature of buffer 7.00
(6.86) as set in 1.2. When a stable reading is
reached, the WAIT annunciator will stop flashing and
stay off. The SLOPE annunciator will start to flash.
This means that the standardization at buffer
7.00(6.86) has been completed and the instrument is
now ready to be sloped at a second buffer.
Allow sufficient time for the electrode and ATC/Temp
probe to stabilize before taking any action.
1.4 Remove the pH electrode and ATC/Temp probe from
buffer 7.00 (or 6.86) and rinse both in distilled
water. After rinsing, immerse both in buffer
4.00(4.01) or 9.18(10.01) pH.
1.5 Press the [SLOPE] key. The SLOPE annunciator will
stop flashing and stay on. The WAIT annunciator will
start to flash, indicating that the instrument is
waiting for a stable reading. The display will be

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locked to the second buffer value corresponding to the
temperature of the second buffer. When a stable
reading is reached, the WAIT annunciator will stop
flashing and stay off. The instrument will calculate
and compensate for the pH electrode slope deviation
corresponding to the values of the two calibration
buffers. The instrument is now dual point calibrated
and ready for measurements.
After two point calibration, pressing and holding the
[MEA./EFF.] key for about 5 seconds will display the
new electrode efficiency.
2. Calibration with manual temperature compensation in the
pH-AUTOLOCK mode.
2.1 Connect the pH electrode to the BNC connector of the
instrument. The MAN annunciator will be on. Press the
[MODE] key if necessary to go to pH-AUTOLOCK mode.
2.2 Rinse the pH electrode in distilled water and immerse
it in buffer 7.00(6.86). Set the instrument to display
the temperature of the buffer by pressing the [ ∆ ]
and [ ∇ ] keys. The displayed temperature must be
less than 60. ℃
2.3 Press the [STAND] key. The STAND annunciator will be
on and the WAIT annunciator will flash. This means
that the instrument is waiting for a stable reading.
The display will be locked to the buffer value
corresponding to the temperature of buffer 7.00 (or
6.86) as set in 2.2. When a stable reading is reached,
the WAIT annunciator will stop flashing and stay off.
The SLOPE annunciator will start to flash, indicating
that the standardization at buffer 7.00(6.86) is

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completed and the instrument is ready to be sloped at
a second buffer.
Allow sufficient time for the electrode and ATC/Temp
probe to stabilize before taking any action.
2.4 Remove the pH electrode from buffer 7.00 (or 6.86),
rinse with distilled water and immerse it in buffer
4.00(4.01) or 9.18(10.01). Set the instrument to the
temperature of the 2nd buffer as in 2.2. The displayed
temperature must be less than 60. ℃
2.5 Press the [SLOPE] key. the SLOPE annunciator will stop
flashing and stay on. The WAIT annunciator will start
to flash, indicating that the instrument is waiting
for a stable reading. The display will be locked to
the value of the second buffer corresponding to the
temperature of the second buffer as set in 2.3 . When
a stable reading is reached, the WAIT annunciator will
stop flashing and stay off. The instrument will
calculate and compensate for the pH electrode slope
deviation corresponding to the values of the two
calibration buffers. The instrument is now dual point
calibrated and ready for measurements.
3. Calibration with ATC/Temp probe in pH mode.
3.1 Connect the pH electrode to the BNC connector and the
ATC/Temp probe to the ATC/Temp connector of the
instrument. The ATC annunciator on the LCD will be on.
Press the [MODE] key for the LCD to display pH and the
AUTOLOCK annunciator to be off.
3.2 Rinse the pH electrode and ATC/Temp probe in distilled
water and immerse them in pH buffer 7.00(6.86).the
instrument will display the buffer temperature.
3.3 Allow sufficient time for the electrode and ATC/Temp

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probe to stabilize. Press the [STAND] key. The STAND
annunciator will be on and the SLOPE annunciator will
flash, indicating that standardization at buffer 7.00
(6.86) is completed and the instrument is ready to be
sloped at a second buffer. The instrument will display
the buffer value corresponding to the temperature of
the buffer 7.00(6.86) as measured in 3.2. If the
reading still drifts, repeat 3.3 until a stable
reading is obtained.
3.4 Remove the pH electrode and ATC/Temp probe from
buffer 7.00(6.86). Rinse them in distilled water and
immerse them in buffer 4.00(4.01) or 9.18(10.01). The
instrument will display the temperature of the second
buffer.
3.5 Allow sufficient time for the pH electrode and
ATC/Temp probe to stabilize. Press the [SLOPE] key.
The SLOPE annunciator will stop flashing and stay on.
The instrument will display the second buffer value
corresponding to the temperature of the second buffer,
as measured in 3.4. If the reading still drifts,
repeat 3.5, until a stable reading is obtained. The
instrument will calculate and compensate for the pH
electrode slope deviation corresponding to the values
of the two calibration buffers. The instrument is now
dual point calibrated and ready for measurements.
After two point calibration, pressing and holding the
[MEA./EFF.] key for about 5 seconds will display the
new electrode efficiency.
4. Calibration with manual temperature compensation in the
pH mode.
4.1 Connect the pH electrode to the BNC connector of the

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instrument. The MAN annunciator will be on. Press the
[MODE] key for the LCD to indicate pH and for the AUTO
annunciator to be off.
4.2 Rinse the pH electrode in distilled water and immerse
in buffer 7.00(6.86). Set the instrument to display
the temperature of the buffer by pressing the [ ∆ ]
and [ ∇ ] keys. The displayed temperature must be
less than 60℃.
4.3 Allow sufficient time for the electrode to stabilize.
Press the [STAND] key. the STAND annunciator will be
on and the SLOPE annunciator will start to flash,
indicating that the standardization at buffer 7.00
(6.86) is completed and the instrument is ready to be
sloped at a second buffer. The instrument will display
the buffer value corresponding to the temperature of
the buffer 7.00(6.86) set in 4.2. If the reading still
drifts, repeat 4.3 until a stable reading is obtained.
4.4 Remove the pH electrode from buffer 7.00(6.86), rinse
with distilled water and immerse it in buffer
4.00(4.01) or 9.18(10.01). Set the instrument to the
temperature of the 2nd buffer as in 4.2. The displayed
temperature must be less than 60. ℃
4.5 Allow sufficient time for the pH electrode to
stabilize. Press the [SLOPE] key. the SLOPE
annunciator will stop flashing and stay on. The
instrument will display the value of the second buffer
corresponding to the temperature of the second buffer
as set in 4.4. If the reading still drifts, repeat
4.5, until a stable reading is obtained. The
instrument will calculate and compensate for the pH
electrode slope deviation corresponding to the values

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of the two calibration buffers. The instrument is now
dual point calibrated and ready for measurements.
After two point calibration, pressing and holding the
[MEA./EFF.] key for about 5 seconds will display the
new electrode efficiency.
pH MEASUREMENTS
The STAND and SLOPE annunciators must be on. This means that
the instrument is dual point calibrated and is ready for
measurements.
1. Measurement with ATC/Temp probe in the pH-AUTOLOCK mode.
1.1 Connect the pH electrode and ATC/Temp probe to the
connector of the instrument. The ATC annunciator will
be on.
1.2 Press the [MODE] key until the LCD indicates pH mode
and the AUTO annunciator is on.
1.3 Rinse the pH electrode and the ATC/Temp probe with
distilled water and immerse them in the sample to be
measured.
1.4 Press the [MEA./EFF.] key. The WAIT annunciator will
start flashing. This means the instrument is waiting
for a stable reading. The display will track the pH
value as sensed by the pH electrode and the ATC/Temp
probe. When the display changes less than 0.01 pH in
about 10 seconds the autolock function will be
activated. The WAIT annunciator will stop flashing and
stay off. The reading is then locked and will not
respond to further changes from the pH electrode and
ATC/Temp probe.

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1.5 For samples that are inherently unstable, the
instrument will not AUTOLOCK. In this case, use the pH
NON-AUTOLOCK mode for measurements.
2. Measurement with ATC/Temp probe in the pH NON-AUTOLOCK
mode.
2.1 Connect the pH electrode and the ATC/Temp probe to the
connector of the instrument. The ATC annunciator will
be on .
2.2 Press the [MODE] key for the LCD to indicate pH and
for the AUTO annunciator to be off.
2.3 Rinse the pH electrode and the ATC/Temp probe with
distilled water and immerse them in the sample to
measured.
2.4 Allow sufficient time for the display to stabilize.
The instrument will display the pH value of the sample
at the displayed sample temperature.
3. Measurement with manual temperature compensation in the
pH-AUTOLOCK mode.
3.1 Connect the pH electrode to the connector of the
instrument The MAN annunciator will be on.
3.2 Press the [MODE] key for the LCD to indicate pH and
for the AUTO annunciator to be on.
3.3 Rinse the pH electrode with distilled water and
immerse it in the sample to be measured. Set the
instrument to the temperature of the sample as in 2.2
of pH CALIBRATION section.
3.4 Press the [MEA/EFF.] key. The WAIT annunciator will
start to flash. This means that the instrument is
waiting for a stable reading. The display will track
the pH value as sensed by the pH electrode. When the

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display changes less than 0.01 pH within approximately
10 seconds, the autolock function will be activated.
The WAIT annunciator will stop flashing and stay off.
The reading is then locked and will not respond to
further changes from the pH electrode.
3.5 For samples that are inherently unstable, the
instrument will not autolock. Use the pH NON-AUTOLOCK
mode for measurements.
4. Measurement with manual temperature compensation in the
pH NON-AUTOLOCK mode.
4.1 Connect the pH electrode to the connector of the
instrument.
4.2 Press the [MODE] key for the LCD to display pH and for
the AUTO annunciator to be off.
4.3 Rinse the pH electrode with distilled water and
immerse it in the sample to be measured.
4.4 Allow sufficient time for the display to stabilize.
The instrument will display the pH value of the sample
at the set sample temperature.
TEMPEARTURE MEASUREMENTS
The model 6173 can be used to measure temperature
independently with the ATC/Temp probe without using the pH
electrode.
1. Place the ATC/Temp probe in the media to be measured. The
measured temperature is displayed.
2. If "Undr/OvEr" is displayed on, the temperature is out of
the temperature range of -10.0 to 120. ℃ . Once the
temperature is brought within range, then "Undr/OvEr" will

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disappear and the correct temperature reading will be
displayed. It is not necessary to press the [CLEAR] key.
mV MEASUREMENTS
1. Measurement in the mV-AUTOLOCK mode.
1.1 Connect the optional combination ORP electrode to the
BNC connector of instrument.
1.2 Press the [MODE] key for the LCD to indicate mV and
for the AUTO annunciator to be on.
1.3 Rinse the electrode with distilled water and immerse
it in the sample to be measured.
1.4 Press the [MEA./EFF.] key. The WAIT annunciator will
start to flash. This means the instrument is waiting
for a stable reading. The display will track the mV
value as sensed by the electrode,. When the display
changes less than 1 mV within 10 seconds, the AUTOLOCK
function will be activated. The WAIT annunciator will
stop flashing and stay off. The reading is then locked
and will not respond to further changes from the
electrode. The “lock” display is the mV value of the
sample.
If "OvEr/Undr" is displayed, the mV value measured is
out of the “-2000/+2000 mV” range. The instrument
will display the correct value once the input mV is
brought within range. It is not necessary to press the
[CLEAR].
1.5 The ATC/Temp probe can be used to measure the sample
temperature as required.

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1.6 For samples that are inherently unstable, the
instrument will not autolock. In this case, use the mV
NON-AUTOLOCK mode for measurements.
2. Measurement in the mV NON-AUTOLOCK mode.
2.1 Connect an ORP electrode to the BNC connector of
instrument.
2.2 Press the [MODE] key for the LCD to indicate mV and
for the AUTO annunciator to be off.
2.3 Rinse the electrode with distilled water and immerse
it in sample to be measured.
2.4 Allow sufficient time for the display to stabilize.
The instrument will display the mV value of the
sample.
If "OvEr/Undr”" is displayed, the mV value measured
is out of the “-2000/+2000 mV” range. The instrument
will display the correct value once the input mV is
brought within range. It is not necessary to press the
[CLEAR].
2.5 The ATC/Temp probe can be used to measure the sample
temperature as required.
pH BUFFERS
The temperature coefficient of pH calibration buffers
4.00 ,4.01, 6.86, 7.00, 9.18 and 10.01 are stored inside the
instrument. The buffers used to calibrate the instrument
must exhibit the same temperature characteristics as the
stored values.

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Temperature coefficient of the pH buffers
℃ 4.00 6.86 9.18 4.01 7.00 10.01
0 4.01 6.98 9.46 4.01 7.11 10.32
5 4.00 6.95 9.39 4.01 7.08 10.25
10 4.00 6.92 9.33 4.00 7.06 10.18
15 4.00 6.90 9.28 4.00 7.03 10.12
20 4.00 6.88 9.23 4.00 7.01 10.06
25 4.00 6.86 9.18 4.01 7.00 10.01
30 4.01 6.85 9.14 4.01 6.98 9.97
35 4.02 6.84 9.10 4.02 6.98 9.93
40 4.03 6.84 9.07 4.03 6.97 9.89
45 4.04 6.83 9.04 4.04 6.97 9.86
50 4.06 6.83 9.02 4.06 6.97 9.83
55 4.07 6.83 8.99 4.08 6.97 9.80
60 4.09 6.84 8.97 4.10 6.98 9.78
Note : The actual reading of the instrument can differ from
the values shown by ±0.01 pH.
SPECIFICATIONS
Display Range Accuracy Resolution
pH -6.00 to 20.00 pH ±0.01pH,±1digit 0.01 pH
mV -2000 to 2000 mV ±0.05%FS,±1digit 1mV
Temperature℃ -10.0 to 120℃ ±0.5 ℃ 0.1 ℃
pH Temp compensation AUTO/MANual -10.0 to 120.0℃
pH Buffer recognition (4.01,7.00&10.01)or(4.00,6.86
,9.18)
pH Buffer Temp. range 0 to 60℃
PH Electrode Offset recognition ±90mV at pH 7.00 or 6.86
pH Electrode Slope recognition ±30% at pH 4.01,9.18 or 10.01
Input Impedance >1013 Ω
Power Supply : Batteries/Adapter Six 1.5V batteries/AC adaptor

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Battery Life About 500 hours
Calibration Back-up EEPROM
Audio Feedback All Touch Keys
End Point Sensing & Hold Yes
LCD Size ( pH/mV : Temp) 16mm : 21 mm high LCD
Ambient Temp. Range 0 to 50 ℃
Relative Humidity up to 95%
ATC Probe Thermistor, 10kΩ
RS-232 communication Bate Rate 9600
Dimensions (W x D x H ) 230mm L x 165 mm W x 80 mm H
Weight 650 grams (Batteries not
included)
WARRANTY
Jenco Instruments, Inc. warranties the model 6173 for a
period of one year, from date of purchase, against all
defects in material and workmanship. This warranty does not
apply to the abuse and misuse of the instrument. If repair
or adjustment is required, please return the defective
instrument, freight prepaid. Instrument within warranty
period will be repaired at no charge. Please make sure that
the instrument is properly packaged and insured against
possible damage in shipment.
Authorization must be obtained from a Jenco representative
before returning items for any reason.