JENCO 6177M User manual

Operation Manual
MODEL 6177M/6177EU
Microcomputer Based
pH/ORP/ Temperature
Benchtop Meter
6177M/6177EU

1
CONTENTS
GENERAL INTRODUCTION 2
INITIAL INSPECTION 3
POWER INPUT 3
INSTALLING THE BATTERIES 3
CONNECTORS 4
DISPLAY & KEY FUNCTIONS 4
A. Display 4
B. Operational keys description 5
OPERATIONAL PROCEDURES 7
A. Buffer Set Selection 7
B. pH Calibration 7
C. pH Measurements 11
D. Temperature Measurements 12
E. mV offset 13
F. mV (Rmv) Measurements 13
G. Save, Recall and Delete Data 14
H. pH Buffers 15
ERROR DISPLAYS AND TROUBLESHOOTING 16
SPECIFICATIONS 17
WARRANTY 18
RETURN OF ITEMS 18

2
GENERAL INTRODUCTION
Thank you for selecting the 6177M/6177EU meter. The
6177M/6177EU is a precision tool that measures pH, mV （RmV）
and temperature. A built-in microprocessor stores, calculates and
compensates for all parameters related to pH determinations
including pH electrode temperature characteristics, electrode slope
deviations, offset and buffer solutions.
This meter has a waterproof IP54 case. The mechanical keys are
highly reliable with tactile and audio feedback. It is powered by six
AAA-size alkaline batteries or with a UL/CE approved AC adapter
(OUTPUT:DC 9 V). The meter also displays a “BAT” message when
the batteries are in need of replacement. Re-calibration is not
required when power is restored.
The front of the meter has a large LCD that displays pH , mV , Rmv
and temperature simultaneously along with user prompts and mode
indicators. The unit prompts the user through calibration and
measurement procedures.
An AUTOLOCK feature for both pH and mV（RmV）measurements
enables the unit to automatically sense the end point and the
“LOCK” display indicates the end point value of a measurement.
AUTOLOCK and user prompts help eliminate most errors in
determining pH and mV values, resulting in precise, repeatable and
error-free measurements. The 6177M/6177EU can also be used in
non-AUTOLOCK mode.
The unit is also equipped with a non-volatile memory allowing the
user to store 750 different sets of readings. This unit will assign a
site number for each set of reading so the user can review the data
easily.
The model 6177M/6177EU is available with pH, ORP and ATC
(Automatic Temperature Compensation) probes. Other features
include up to 5 point calibration for pH and 1 point calibration for
ORP, electrode offset recognition, electrode slope recognition,
electrode efficiency display, built-in buffer coefficients, automatic or
manual temperature compensation and 50/60 Hz AC noise
rejection. This meter is user-friendly for laboratory application.
[ IMPORTANT NOTE: The 6177M has a 10 KΩ thermistor and the
6177EU has a 30 KΩ thermistor. There temperature sensor is not
interchangeable.]

3
INITIAL INSPECTION
Carefully unpack the unit 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.
POWER INPUT
The model 6177M/6177EU can be powered by an UL/CE approved
100 to 240 VAC adaptor as well as 6 “AAA” alkaline batteries.
Check the label on the AC adaptor supplied with the instrument to
make sure that the AC line voltage is correct. If the wrong AC
adaptor is supplied, notify your Jenco representative immediately.
INSTALLING THE BATTERIES
To insert the batteries into the meter, follow the procedure outlined
below.
1. Use a Philip screw driver and unlock the battery cover by
turning the screw driver in the counter clockwise direction.
After unlocking the screw, take off the battery cover (Fig.1)
2. Replace the old batteries with new ones and install them in the
correct polarity position.
3. Put the battery cover back on the instrument. Use a Philip
screw driver and turn the screw in the clockwise direction to
lock the battery cover.
Figure 1: Battery compartment

4
CONNECTORS
1 2 3
Figure 2: 6177M Connectors
1. pH/ORP connector (BNC connector)
2. ATC connector (8 PIN connector)
3. AC adaptor input connector
Figure 3: 6177EU Connectors
1. pH/ORP connector (BNC connector)
2. ATC connector (2.5 mm phone jack)
3. AC adaptor input connector
DISPLAY & KEY FUNCTIONS
A. Display
1
2
3
4
5
6
7
9
10
12
11
81.68 4.01 7.00 10.01
4.00 6.86 9.18 12.46
Figure 4: Active LCD screen

5
1. WAIT-
This will be displayed when the
unit is still waiting for a stable
reading or end point sensing.
7. AUTO-
AUTOLOCK mode indicator.
2. BAT-
Low battery indicator.
8. Buffer selection-
This indicator will flash if the
unit is not yet calibrated. This
indicator will remain lit-up if
the unit has been calibrated.
3. pH-
Unit and mode indicators.
9. LOCK-
This will indicate that the
reading is frozen during
AUTOLOCK mode.
4. mV (RmV)-
Unit and mode indicators.
10. EFF-
This will be displayed if the
user is viewing the efficiency
of the electrode. It is
recommended to use a new
electrode when the efficiency
value is less over than 75%.
5. ATC/MAN-
ATC indicator will be displayed
if a temperature probe is
connected otherwise the MAN
indicator will be displayed.
11. MAIN DISPLAY-
For pH, mV and probe
efficiency values.
6. CAL-
This will be displayed when the
unit enters into the calibration
mode.
12. SECONDARY DISPLAY-
For temperature in ℃.
B. Operational keys description
Figure 5

6
NO.
Key
Description
1
Stand
Stand & Slope/Enter-
These two keys are used for pH and ORP
calibration. For their specific functions, please
see the "calibration" section in each parameter.
In the measure mode, press “Slope/Enter”
key for 2 seconds, in order to save reading into
the data storage site.
At the Recall interface, press “Slope/Enter”
key to display the last set of saved data.
In the “Delete All” mode, press “Slope/Enter”
and enters the selection screen.
In the “Delete One” mode, press
“Slope/Enter” key to delete a single set of
data.
2
Mode-
Selects display mode. Pressing this key
changes the display sequentially to display
pH-AUTOLOCK, mV (RmV)-AUTOLOCK, pH ,
mV (RmV), Recall, Delete One and Delete ALL.
The calibration values will not be affected by
changing the display modes.
In the calibration mode, press “Mode” key to
exit calibration mode.
In “Recall” and “Delete” modes, press “Mode”
key to exit “Recall” and “Delete” modes
respectively.
3
Mea.
Eff.
Stand
Slope
Mode
Clear
Clear-
It is used to clear the unit when error signal
appears. It clears all calibration values stored in
the internal memory.
In the pH mode or mV (Rmv) mode, when the
“Clear” key is pressed for 5 seconds, all
segments of the LCD will be on. After 2
seconds the unit will enter the pH-AUTOLOCK
mode or mV (Rmv)-AUTOLOCK mode. The
meter clears all calibration values stored in
internal memory.
4
Mea.
Eff.
Stand
Slope
Mode
Clear
On/Off-
Press and hold this key for 2 seconds to power
on and shut off the meter.
5
Mea.
Eff.
Stand
Slope
Mode
Clear
Mea./Eff.-
The key is used to bring the unit out of the
AUTOLOCK condition when operating in the
pH-AUTOLOCK or mV (RmV) - AUTOLOCK
mode.
In the pH measure mode, press and hold this
key for 5 seconds, the LCD will display the
efficiency of the electrode and the offset value.
Slope
Enter
Mea.
Eff.
Stand
Slope
Mode
Clear

7
In the ORP measure mode, press and hold this
key for 5 seconds, the LCD will display the
offset value of the electrode.
6
Mea.
Eff.
Stand
Slope
Mode
Clear
Mea.
Eff.
Stand
Slope
Mode
Clear
Up & Down-
In the pH/ORP measure mode, these two keys
are used to manually enter the temperature
values. They have no effect on the unit when
operating in ATC mode.
In the ORP calibration mode, these two keys
are used to adjust the RmV display value.
In the “Recall” mode, view saved data and data
storage site number by pressing these keys.
In the “Delete ALL” mode, select between the
“Yes” and “No” for data all delete.
In the “Delete One” mode, view to be deleted
data and data site numbers by pressing these
keys.
OPERATIONAL PROCEDURES
A. pH Buffer Set Selection
The 6177M/6177EU meter has two buffer sets: 1.68, 7.00,
4.01, 10.01, 12.46 pH and 1.68, 6.86, 4.00, 9.18, 12.46 pH.
To change the buffer set, turn off the unit, then press and hold
the “Stand” key while turning on the unit again.
[Note: There is no need to repeat this procedure every time
the unit is power up unless one decides to change the buffer
settings.]
B. pH Calibration
The 6177M/6177EU uses up to 5 point calibration.
[Note: If the device is required to perform more than one
calibration points, the first calibration point must be 6.86/7.00
pH.]
a. Calibration with an ATC/Temp probe in the pH-AUTOLOCK
mode.
1. Turn the unit on. In pH mode, press “Clear” key for 5
seconds, all LCD elements will lit up. The meter clears all
calibration values stored in internal memory.
2. Connect the pH electrode to the BNC connector and the
ATC/Temp probe to the ATC/Temp connector of the unit.

8
3. Press “Mode” key to go to pH-AUTOLOCK mode. “ATC” icon,
“pH” icon and “AUTO” icon will lit up. The "CAL" icon begins
to flash.
4. Rinse the pH and ATC/Temp probes in distilled water and
immerse them in the first buffer solution. Allow temperature
reading to stabilize, then press and hold “Stand” key for 2
seconds to calibrate. The “WAIT” icon will flash until the unit
detects a stable reading. Once the unit calibrates the first
point, the selected buffer will lit up while two other selectable
buffers start to flash. The unit is ready to be sloped at the
second buffer.
[Note: If the first buffer solution is 7.00 or 6.86 pH, at this
moment, press the “Mode” key. The unit will exit the
calibration mode. Single point calibration is complete.
If the first buffer solution is 1.68, 4.00, 4.01, 9.18 , 10.01 or
12.46 pH, at this moment, the unit will automatically exit the
calibration mode. Single point calibration is complete.]
5. Rinse the pH and ATC/Temp probe in distilled water and
immerse them in the second buffer solution (either 4.00 / 4.01
pH or 9.18 / 10.01 pH corresponding to the flashing number
on display). Allow temperature reading to stabilize, then press
“Slope/Enter” key to calibrate. The “WAIT” icon will flash
until the unit detects a stable reading. Once the unit calibrates
the second point, the selected two buffers lit up and the
remaining buffer starts to flash. The unit is ready to be sloped
at the third buffer.
[Note: At this moment, press the “Mode” key, the unit will
exit the calibration mode. Dual point calibration is complete.]
6. The third point, the fourth point and the fifth point are the
same as the second calibration point. When the unit
completed the fifth point calibration, press the “Mode” key
and exit calibration.
7. The unit calculates and compensates for the pH electrode
slope deviation corresponding to the values of the calibrated
buffers. After calibration, press and hold “Mea./Eff.” key for
about 5 seconds to display the new electrode efficiency and
offset.
b. Calibration with manual temperature compensation in the
pH-AUTOLOCK mode.
1. Turn the unit on. In pH mode, press “Clear” key for 5 seconds,
all LCD elements will lit up. The meter clears all calibration
values stored in internal memory.

9
2. Connect the pH electrode to the BNC connector of the unit.
3. Press “Mode” key to go to pH-AUTOLOCK mode. “MAN” icon,
“pH” icon and “AUTO” icon will lit up. The "CAL" icon will begin
to flash.
4. Rinse the pH probes in distilled water and immerse it in the
first buffer solution. Adjust the temperature reading to that of
the first buffer using the “Up” or “Down” keys (0.0 to 60.0 ℃).
Then press and hold “Stand” key for 2 seconds to calibrate.
The “WAIT” icon will flash until the unit detects a stable
reading. Once the unit calibrates the first point, the selected
buffer remains lit up while two other selectable buffers start to
flash. The unit is ready to be sloped at the second buffer.
[Note: If the first buffer solution is 7.00 or 6.86 pH, at this
moment, press the “Mode” key, the unit will exit the
calibration mode. Single point calibration is complete.
If the first buffer solution is 1.68, 4.00, 4.01, 9.18, 10.01 or
12.46 pH, at this moment, the unit will automatically exit the
calibration mode. Single point calibration is complete.]
5. Repeat steps 5 of “Calibration with an ATC/Temp probe in
the pH-AUTOLOCK mode” for 2 to 5 point calibration.
6. The unit calculates and compensates for the pH electrode slope
deviation corresponding to the values of the calibrated buffers.
After calibration, press and hold “Mea./Eff.” key for about 5
seconds to display the new electrode efficiency and offset.
c. Calibration with an ATC/Temp probe in the pH NON-
AUTOLOCK mode.
1. Turn the unit on. In pH mode, press “Clear” key for 5 seconds,
all LCD elements will lit up. The meter clears all calibration
values stored in internal memory.
2. Connect the pH electrode to the BNC connector and the
ATC/Temp probe to the ATC/Temp connector of the unit.
3. Press “Mode” key for the LCD to display pH and the
AUTOLOCK annunciator is off. “ATC” icon will lit up, “pH” icon
is on. The "CAL" icon will begin to flash.
4. Rinse the pH and ATC/Temp probes in distilled water and
immerse them in the first buffer solution. Allow temperature
and pH reading to stabilize, then press and hold “Stand” key
for 2 seconds to calibrate, the unit immediately calibrates the
first point, the selected buffer remains lit up while two other
selectable buffers start to flash. The unit is ready to be sloped
at the second buffer.

10
[Note: If the first buffer solution is 7.00 or 6.86 pH, at this
moment, press the “Mode” key, the unit will exit the calibration
mode. Single point calibration is complete.
If the first buffer solution is 1.68, 4.00, 4.01, 9.18, 10.01 or
12.46 pH, at this moment, the unit will automatically exit the
calibration mode. Single point calibration is complete.]
5. Rinse the pH and ATC/Temp probe in distilled water and
immerse them in the second buffer solution (either 4.00/4.01
pH or 9.18/10.01 pH corresponding to the flashing number on
display). Allow temperature reading to stabilize, then press
“Slope/Enter” key to calibrate. The unit immediately
calibrates the second point, the selected two buffers lit up and
the remaining buffer starts to flash. The unit is ready to be
sloped at the third buffer.
[Note: At this moment, press the “Mode” key, the unit will
exit the calibration mode. Dual point calibration is complete.]
6. The third point, the fourth point and the fifth point are the
same as the second point calibration. When the unit
completed the fifth calibration point, press the “Mode” key
and exit calibration.
7. The unit calculates and compensates for the pH electrode
slope deviation corresponding to the values of the calibrated
buffers. After calibration, press and hold “Mea./Eff.” key for
about 5 seconds to display the new electrode efficiency and
offset.
d. Calibration with manual temperature compensation in the
pH NON-AUTOLOCK mode.
1. Turn the unit on. In pH mode, press “Clear” key for 5 seconds,
all LCD elements will lit up. The meter clears all calibration
values stored in internal memory.
2. Connect the pH electrode to the BNC connector of the unit.
3. Press “Mode” key for the LCD to display pH and the
AUTOLOCK annunciator is off. “MAN” icon will lit up, “pH” icon
is on. The "CAL" icon will begin to flash.
4. Rinse the pH probes in distilled water and immerse it in the
first buffer solution. Adjust the temperature reading to that of the
first buffer using the “Up” or “Down” keys (0.0 to 60.0 ℃)
before pressing “Stand” key. Then press and hold “Stand”
key for 2 seconds to calibrate. The unit immediately calibrates
the first point, the selected buffer remains lit up while the
remaining buffers start to flash. The unit is ready to be sloped
at the second buffer.

11
[Note: If the first buffer solution is 7.00 or 6.86 pH, at this
moment, press the “Mode” key, the unit will exit the calibration
mode. Single point calibration is complete.
If the first buffer solution is 1.68, 4.00, 4.01, 9.18, 10.01 or
12.46 pH, at this moment, the unit will automatically exit the
calibration mode. Single point calibration is complete.]
5. Repeat steps 5 of “Calibration with an ATC/Temp probe in
the pH NON- AUTOLOCK mode” for 2 to 5 point calibration.
6. The unit calculates and compensates for the pH electrode slope
deviation corresponding to the values of the calibrated buffers.
After calibration, press and hold “Mea./Eff.” key for about 5
seconds to display the new electrode efficiency and offset.
C. pH Measurements
To take pH measurements, 6177M/6177EU must be calibrated
before first use.
a. Measurement with an ATC/Temp probe in the pH-
AUTOLOCK mode.
1. Connect the pH electrode to the BNC connector and the
ATC/Temp probe to the ATC/Temp connector of the unit. The
“ATC” icon will lit up.
2. Press “Mode” key until “pH”, “AUTO”, “ATC”,“buffer”, “WAIT”
icons lit up.
3. Rinse the pH electrode and ATC/Temp probe with distilled
water and immerse in the sample to be measured. Remove
any air bubbles trapped around the probe by shaking or
stirring the probe.
4. Press the “Mea./Eff.” key. The “WAIT” icon will start flashing.
The unit is waiting for a stable reading. The display will track
the pH value as sensed by the pH electrode and the
ATC/Temp probe.
5. When the “WAIT” icon disappears and the “LOCK” icon
appears, the meter will not respond to further changes from
the sample. The pH value shown is the pH value of the sample
at the displayed sample temperature.
[Note: For samples that are inherently unstable, the unit will
not AUTOLOCK. In this case, use the pH NON- AUTOLOCK
mode for measurements.]
b. Measurement with manual temperature compensation in
the pH-AUTOLOCK mode.

12
1. Connect the pH electrode to the BNC connector of the unit.
The “MAN” icon will lit up. Set unit to display the sample
temperature by pressing the “Up” and “Down” keys (0.0 to
100.0 ℃).
2. Press “Mode” key until “pH”, “AUTO”, “MAN”,“buffer”, “WAIT”
icons lit up.
3. Repeat steps 3 to 5 of “Measurement with an ATC/Temp
probe in the pH- AUTOLOCK mode”.
c. Measurement with an ATC/Temp probe in the pH NON-
AUTOLOCK mode.
1. Connect the pH electrode to the BNC connector and the
ATC/Temp probe to the ATC/Temp connector of the unit. The
“ATC” icon will lit up.
2. Press “Mode” key until “pH”, “ATC”,“buffer” icons lit up.
3. Rinse the pH electrode and ATC/Temp probe with distilled
water and immerse in the sample to be measured. Remove
any air bubbles trapped around the probe by shaking or
stirring the probe.
4. Allow sufficient time for the display to stabilize. The instrument
will display the pH value of the sample at the displayed sample
temperature.
d. Measurement with manual temperature compensation in
the pH NON-AUTOLOCK mode.
1. Connect the pH electrode to the BNC connector of the unit.
The “MAN” icon will lit up. Set unit to display the sample
temperature by pressing the “Up” and “Down” keys (0.0 to
100.0 ℃).
2. Press “Mode” key until “pH”, “MAN”,“buffer” icons lit up.
3. Repeat steps 3 to 4 of “Measurement with an ATC/Temp
probe in the pH NON- AUTOLOCK mode”.
D. Temperature Measure
The 6177M/6177EU can measure temperature independently
with the ATC/Temp probe without using the pH electrode. Place
the ATC/Temp probe in the sample. The unit will display the
measured temperature.

13
E. mV Offset
1. Turn the unit on. In mV mode, press “Clear” key for 5
seconds, all LCD elements will lit up. The meter clears all
calibration values stored in internal memory.
2. Connect the ORP electrode to the BNC connector of the unit,
“MAN” and “mV” icons will lit up.The "WAIT" icon begins to
flash.
3. Rinse the ORP probe in distilled water and immerse it in the
standard solution. Then press and hold “Stand” key for 2
seconds to calibrate. The “CAL” and “RmV” icons will lit up.
According to the mV (RmV) value displayed, press the “Up”
and “Down” keys to adjust the display value to the same
value as the standard solution. Press the “Slope/Enter” key
to save and complete the calibration.
4. Press and hold “Mea./Eff.” key for about 5 seconds to
display the new electrode offset.
F. mV (RmV) Measurements
a. Measurement in the mV (RmV)-AUTOLOCK mode.
1. Connect the optional combination ORP electrode to the BNC
connector of the unit.
2. Press “Mode” key until “mV” or “RmV” icon, “MAN”, “AUTO”
icons lit up. The "WAIT" icon begins to flash.
3. Rinse electrode with distilled water and immerse it in sample
to be measured. Remove any air bubbles trapped around the
probe by shaking or stirring the probe.
4. Press the “Mea./Eff.” key. The “WAIT” icon will start flashing.
The unit is waiting for a stable reading. The display will track
the mV (Rmv) value as sensed by the ORP electrode.
5. When the “WAIT” icon disappears and the “LOCK” icon
appears, the meter will not respond to further changes from the
sample. The mV (RmV) value is the sample reading.
[Note: For samples that are inherently unstable, the unit will
not AUTOLOCK. In this case, use the mV (RmV) NON-
AUTOLOCK mode for measurements.]
b. Measurement in the mV (RmV) NON-AUTOLOCK mode.
1. Connect the optional combination ORP electrode to the BNC
connector of the unit.

14
2. Press “Mode” key until “mV” or “RmV” and “MAN” icons lit
up.
3. Rinse electrode with distilled water and immerse it in sample to
be measured.Remove any air bubbles trapped around the
probe by shaking or stirring the probe.
4. Allow sufficient time for the display to stabilize. The instrument
will display the mV (RmV) value of the sample.
G. Save, Recall and Delete Data
a. Saving readings to memory.
1. In the measure modes, press and hold “Slope/Enter” key
for 2 seconds to save data. The “ID” icon and number with
the corresponding site number will lit up for a brief moment
to indicate a successful data save.Saving is now complete.
2. If the “Full” icon is displayed, this means that all 750 data
saving sites are used up. No new data can be saved until
existing saved data are deleted.
b. Recalling readings from memory.
1. To recall saved data, press “Mode” key until the “Recall”
icon lit up. Press "Slope/Enter" key to go into “Recall”
mode.
2. Press the “Up” or “Down” keys to select the storage site
number.
3. Press “Mode” key to exit “Recall” mode.
c. Deleting data.
1. Press “Mode” key until the “Delete one” or “Delete ALL” icon
shows up. Then press the “Slope/Enter" key to go into the
corresponding “Delete one ” or “Delete ALL” mode.
2. In the “Delete ALL” mode, press the “Slope/Enter” and enters
the selection screen. Use the “Up” and “Down” key to select
yes/no for clearing all stored data.To clear all data, must
select yes and press the “Slope/Enter” key. “none” icon
shows up after data is completely deleted.
3. In the “Delete one” mode, use “Up” and “Down” key to select
data to be deleted. Then press “Slope/Enter” key to delete.
Deletion is now complete. The next set of saved data will
automatically move up a slot in the storage site.

15
4. Press “Mode” key to exit “Delete” mode.
H. pH Buffers
The temperature coefficient of pH calibration buffers 1.68, 4.00,
4.01, 6.86, 7.00, 9.18 , 10.01 and 12.46 pH are stored inside
the instrument. The buffers used to calibrate the instrument
must exhibit the same temperature characteristics as the
stored values.
Temperature coefficient of the pH buffers
°C
1.68
4.00
6.86
9.18
4.01
7.00
10.01
12.46
0
1.67
4.01
6.98
9.46
4.01
7.11
10.32
13.42
5
1.67
4.00
6.95
9.39
4.01
7.08
10.25
13.21
10
1.67
4.00
6.92
9.33
4.00
7.06
10.18
13.01
15
1.67
4.00
6.90
9.28
4.00
7.03
10.12
12.80
20
1.68
4.00
6.88
9.23
4.00
7.01
10.06
12.64
25
1.68
4.00
6.86
9.18
4.01
7.00
10.01
12.46
30
1.68
4.01
6.85
9.14
4.01
6.98
9.97
12.30
35
1.69
4.02
6.84
9.10
4.02
6.98
9.93
12.13
40
1.69
4.03
6.84
9.07
4.03
6.97
9.89
11.99
45
1.70
4.04
6.83
9.04
4.04
6.97
9.86
11.84
50
1.71
4.06
6.83
9.02
4.06
6.97
9.83
11.71
55
1.72
4.07
6.83
8.99
4.08
6.97
9.80
11.57
60
1.72
4.09
6.84
8.97
4.10
6.98
9.78
11.45
[Note: The actual reading of the instrument can differ from the
values shown by ±0.01 pH ]

16
ERROR DISPLAYS AND TROUBLESHOOTING
[Note: If the meter still does not perform normally after the above
measures are taken, call Jenco representative.]
Main
Display
Possible cause(s)
Corrective Action(s)
"Er1"
1. “Stand” was pressed
before the electrode and
ATC/Temp probe settled
to within +/-1.00 pH of the
buffer value.
2. pH electrode offset is
greater/less than +/-1.00
pH.
3. pH electrode is faulty.
1. Press “Clear” key, allow
sufficient time for the
electrode and ATC/Temp
probe to stabilize, re-press
“Stand” key to start the
calibration procedure.
2. Replace the buffer and/or
the pH electrode. Press
“Clear” key to recalibrate
meter.
3. Replace electrode.
"Er2"
1. “Slope/Enter” was
pressed before the
electrode and ATC/Temp
probe settled to within
30% of the buffer value.
2. Buffer 1.68, 4.00, 4.01,
9.18, 10.01 and 12.46 pH
is not correct.
3. pH electrode slope is off
by more than 30% of
ideal slope.
1. Allow sufficient time for the
electrode and ATC/Temp
probe to stabilize, re-press
“Slope/Enter” key to
continue the calibration
procedure.
2. Check if the correct buffer
is used.
3. Replace the buffer and/or
the pH electrode. Press
“Clear” key to recalibrate
meter.
"Er3"
In pH calibration mode,
temperature is out of the
0.0 to 60.0 °C range.
Bring the pH buffer
temperature within range.
"over"/
“undr”
1. Measured pH is out of
the -2.00 to 16.00 pH
range.
2. Measured mV (RmV) is
out of the –1999.9 to
1999.9 mV range.
3. Measured temperature is
out of the 0.0 to 100.0 °C
range.
1. Bring sample pH into the
correct measuring range.
2. Bring sample ORP into the
correct measuring range.
3. Bring sample temperature
into the correct measuring
range.

17
SPECIFICATIONS
Display
Range
Resolution
Accuracy
pH
-2.00 to 16.00 pH
0.01 pH
±0.01 pH
mV (RmV)
-1999.9 to 1999.9 mV
0.1 mV
±0.05% F.S.
Temperature
0.0 to 100.0 °C
0.1 °C
±0.2 °C
pH buffer recognition
1.68, 7.00, 4.01, 10.01,12.46
pH or 1.68, 6.86, 4.00, 9.18,
12.46 pH
pH Temperature compensation
AUTO/MAN 0.0 to 100.0 °C
pH Buffer Temperature range
0 to 60.0 °C
pH calibration
Up to 5 points
mV calibration
1 point. Offset ±150 mV
Input impedance
>1 x 1012 Ω
Temperature sensor
Thermistor, 10 k Ω at 25 °C
(6177M)
Thermistor, 30 k Ω at 25 °C
(6177EU)
Power
6 X 1.5 V AAA Batteries or
100 to 240 VAC adapter
Calibration Back-up
EEPROM
Memory
750 sets
Audio Feedback
All touch keys
End Point Sensing & Hold
Yes
Screen
Segmented LCD w/ backlight
Ambient Temperature Range
0 to 50 °C
Relative Humidity
Up to 90%
Case
IP54
Dimensions
150 x 210 x 45 mm
Weight
430 grams

18
WARRANTY
Jenco warrants this product to be free from significant deviations
in material and workmanship for a period of 1 year from date of
purchase. If repair or adjustment is necessary and has not been
the result of abuse or misuse, within the year period, please
return-freight-prepaid and the correction of the defect will be made
free of charge. If you purchased the item from our Jenco
distributors and it is under warranty, please contact them to notify
us of the situation. Jenco Service Department alone will
determine if the product problem is due to deviations or customer
misuse.
Out-of-warranty products will be repaired on a charge basis.
RETURN OF ITEMS
Authorization must be obtained from one of our representatives
before returning items for any reason. When applying for
authorization, have the model and serial number handy, including
data regarding the reason for return. For your protection, items
must be carefully packed to prevent damage in shipment and
insured against possible damage or loss. Jenco will not be
responsible for damage resulting from careless or insufficient
packing. A fee will be charged on all authorized returns.
NOTE: Jenco reserves the right to make improvements in design,
construction and appearance of our products without notice.

19
Jenco Instruments, Inc.
7968 Arjons Drive, Suite C
San Diego, CA 92126 USA
TEL: [phone]
FAX: [phone]
E-Mail: [email protected]; [email protected]
Website: www.jencoi.com
Jenco Electronics, Ltd.
6F., NO. 81, Sec.2, Chang-an E. Rd., Jhongshan District, Taipei
City 104, Taiwan
TEL: [phone]
FAX: [phone]
E-Mail: [email protected]
Website: www.jenco.com.tw
Shanghai Jenco Instruments, Ltd.
18 Wang Dong Zhong Road
Sijing Town, Songjiang
Shanghai, China
TEL: [phone]
FAX: [phone]
E-Mail: [email protected]
Website: www.jenco.com.cn