TPS MC-81 User manual

Congratulations !
You have purchased the latest in handheld Conductivity-Salinity-pH-
Temperature instrumentation. We trust that your new MC-81 will give you
many years of reliable service.
The MC-81 is a breeze to operate. This manual has been designed to help you
get started, and also contains some handy application tips. If at any stage you
require assistance, please contact either your local TPS representative or the
TPS factory in Brisbane.
The manual is divided into the following sections:
1. Table of Contents
Each major section of the handbook is clearly listed. Sub-sections have also
been included to enable you to find the information you need at a glance.
2. Introduction
The introduction has a diagram and explanation of the display and controls
of the MC-81. It also contains a full listing of all of the items that you
should have received with your MC-81. Please take the time to read this
section, as it explains some of items that are mentioned in subsequent
sections.
3. Main Section
The main section of the handbook provides complete details of the MC-81,
including operating modes, calibration, troubleshooting, specifications, and
warranty terms.
4. Appendices
Appendices containing background information and application notes are
provided at the back of this manual.
TPS Pty Ltd
4 Jamberoo Street
Springwood, Brisbane,
Australia, 4127
Phone :[phone]
International :61 7 32 900 400
Fax :[phone]
International :61 7 3808 4871
Email :[email protected]
Web Site :www.tpssite.com.au
Model MC-81
Conductivity-Salinity-
pH-Temp. Meter
Handbook Version : 1.1
Date : 16-Sep-99
Author : MS

Page 1
Contents
1. INTRODUCTION...................................................................................................2
1.1 MC-81 Display and Controls......................................................................................................2
1.2 Unpacking Information................................................................................................................4
1.3 Specifications..............................................................................................................................5
2. DISPLAY FORMATS AND READOUT MODES.....................................................6
2.1 Display Formats..........................................................................................................................6
2.2 Readout Modes for Dual Display format....................................................................................6
2.3 Readout Modes for Large Display format..................................................................................7
3. CONDUCTIVITY CALIBRATION...........................................................................8
3.1 Calibration Procedure.................................................................................................................8
3.2 Conductivity Calibration Notes...................................................................................................9
3.3 Conductivity Calibration Messages............................................................................................9
4. SALINITY CALIBRATION ...................................................................................10
4.1 Calibration Procedure...............................................................................................................10
4.2 Salinity Calibration Notes.........................................................................................................11
4.3 Salinity Calibration Messages..................................................................................................11
5. PH CALIBRATION..............................................................................................12
5.1 Calibration Procedure...............................................................................................................12
5.2 pH Calibration Notes ................................................................................................................13
5.3 pH Calibration Messages.........................................................................................................13
6. TEMPERATURE CALIBRATION.........................................................................14
6.1 Temperature Calibration...........................................................................................................14
6.2 Calibration Notes......................................................................................................................14
6.3 Calibration Messages...............................................................................................................15
6.4 Manual Temperature Setting....................................................................................................15
7. BATTERY SAVER FUNCTION............................................................................16
8. SELECTING BUFFERS FOR AUTO BUFFER RECOGNITION............................17
9. INITIALISING THE MC-81...................................................................................18
10. TROUBLESHOOTING ....................................................................................19
10.1 General Error Messages.....................................................................................................19
10.2 Conductivity and Salinity Troubleshooting..........................................................................20
10.3 pH and mV Troubleshooting ...............................................................................................22
10.4 Temperature Troubleshooting.............................................................................................23
11. WARRANTY ...................................................................................................24
12. APPENDICES.................................................................................................26
12.1 Soil Salinity Information.......................................................................................................26
12.2 pH, Conductivity & Salinity Measurement of Soil & Potting Mix........................................28
12.3 Water Classification Types..................................................................................................30
12.4 Care, Cleaning and Maintenance of Conductivity Electrodes............................................31
12.5 Replatinising Conductivity Electrodes.................................................................................32
12.6 pH Electrode Fundamentals................................................................................................33
12.7 Checking the reference junction of a pH electrode............................................................35
12.8 Determining if an instrument or pH electrode is faulty .......................................................36
12.9 Instrument software version number. .................................................................................36

Page 2
1. Introduction
1.1 MC-81 Display and Controls
¬
-
°
±
®
¯

Page 3
¬Display
16 character alpha-numeric display. “Dual Display” Mode shows your
choice of Conductivity + pH, Salinity + pH, Conductivity + Temperature,
Salinity + Temperature, or pH + Temperature simultaneously. A unique
“Large Digit” mode nearly doubles the size of the digits. See section 2.1.
User-friendly prompts and error messages are also provided.
-
Press to calibrate conductivity, salinity, pH and temperature modes. See
sections 3.1, 4.1, 5.1, and 6.1.
Also used to set manual temperature compensation value for pH when the
conductivity sensor is unplugged. See section 6.4.
Also used to select buffers for automatic buffer recognition. See section 8.
®
Press to change modes between Conductivity/Salinity, pH, and Temperature.
Press and hold down this key for 2 seconds to toggle between Conductivity
and Salinity modes. See section 2.2.
¯
Press to switch the MC-81 on and off.
Press and hold down this key for 3 seconds to invoke the Battery Saver
mode. See section 7.
°and ±
Press to toggle the MC-81 between Large Display mode and Dual Display
mode. See section 2.1.
The and keys are also used to set the manual temperature
compensation value if the temperature probe is unplugged. See section 6.4.
NOTE: To initialise the unit and reset the memory, press and hold down the
key while switching the MC-81 on. See section 9.

Page 4
1.2 Unpacking Information
Before using your new MC-81, please check that the following accessories have
been included: Part No
1. MC-81 pH-mV-Temperature Instrument................121131
2. Combination pH Electrode.....................................121207
3. K=1/ATC/Temperature Electrode, plastic body......122201
4. pH6.88 Buffer, 200mL...........................................121306
5. pH4.00 Buffer, 200mL...........................................121381
6. 2.76mS/cm Conductivity Standard, 200mL............122306
7. 2ppK TDS Standard, 200mL..................................122307
8. 9V Battery .............................................................130026
9. MC-81 Handbook..................................................130050
Options that may have been ordered with your MC-81:
1. k=10/ATC/Temperature Electrode, plastic body.....122220
2. 36ppK Salinity Standard, 1L..................................122304
3. Low volume, k=1/ATC/Temp sensor, glass body ...122216
4. NiCad Rechargeable battery and charger................130007
5. Hard Plastic Carry Case .........................................130057

Page 5
1.3 Specifications
Ranges Resolution Accuracy
pH 0 to 14.00 pH 0.01 pH ±0.01 pH
Conductivity k=1 cell 0 to 20.00 mS/cm
k=10 cell 0 to 200.0 mS/cm 0.01 mS/cm 0.1 mS/cm ±0.2%
Salinity k=1 cell 0 to 10.00 ppK
k=10 cell 0 to 100.0 ppK 0.01 ppK 0.1 ppK ±0.3%
Temperature -10.0 to 120.0 oC
(Sensor limit 60 oC) 0.1 oC±0.2 oC
pH Input Impedance :>3 x 1012 Ω
pH Asymmetry Range :-1.00 to 1.00 pH
pH Slope Range :85.0 to 105.0%
Conductivity Sensor Span Range :75 to 133 %
Temperature Sensor Offset Range :-10.0oC to +10.0oC
Temperature Compensation :pH :0 to 120.0 oC, automatic or manual
Cond. :0 to 50.0 oC, automatic only
Auto Standard Recognition :pH :pH4.00, pH6.88 or 7.00, pH9.23
Cond. :k=1 cell :2.76mS/cm,
k=10 cell:2.8mS/cm, 58.0mS/cm
Salinity:k=1 cell :2.00ppK
k=10 cell:2.0 ppK, 36.0ppK
Display :16 Character alphanumeric LCD, with full
text prompts and error messages.
Power :9V Alkaline Battery for 70 hours operation.
Optional NiCad battery/charger pack
available.
Battery Saver :On :Auto switch-off after 5 minutes
Off :Continuous use
Dimensions :158 x 80 x 31 mm
Mass :Instrument only:Approx 200g
Full Kit :Approx 2.0 kg
Environment :Temperature :0 to 45 oC
Humidity :0 to 90 % R.H.

Page 6
2. Display Formats and Readout Modes
2.1 Display Formats
The MC-81 has two display formats:
1. Dual Display format
2. Large Display format
Press the or keys to toggle between these two formats.
NOTE: The digits in Large Display format are made by combining the two
rows of the display. The result is a small gap approximately half way
up the digits.
2.2 Readout Modes for Dual Display format
Press the key to roll through the readout modes.
1. Conductivity/Salinity & pH
Displays Conductivity or Salinity and pH readings simultaneously.
eg : 2.76mS or : 2.00 ppK
7.00 pH 7.00 pH
Press and HOLD the key for 3 seconds to alternate between Conductivity
and Salinity readout in this mode.
The Large Display format is not available from this mode.
Calibration is not available from this mode.
2. Conductivity/Salinity & Temperature
Displays Conductivity or Salinity and Temperature readings simultaneously.
eg : 2.76mS or : 2.00 ppK
25.0oC25.0oC
Press and HOLD the key for 3 seconds to alternate between Conductivity
and Salinity readout in this mode.
NOTE: If the temperature of the solution exceeds 120.0 oC, or the temperature
sensor inside the conductivity electrode is faulty, the temperature
reading on the bottom line is replaced by “OVRoC”, to signify the
over-range condition.

Page 7
3. pH & Temperature
Displays pH and Temperature readings simultaneously.
eg : 7.00 pH
25.0oC
If the temperature probe is unplugged, the manual temperature setting is
displayed with 1oC resolution.
eg : 7.00 pH
25oC
4. Temperature only
Displays just the temperature reading.
eg: 25.0oc
If the temperature probe is unplugged, the manual temperature setting is
displayed with 1oC resolution.
eg: 25oc
2.3 Readout Modes for Large Display format
In Large Display format, the readout modes are:
1. Conductivity/Salinity
Displays just the Conductivity or Salinity reading in large digits.
Press and HOLD the key for 3 seconds to alternate between Conductivity
and Salinity readout in this mode.
2. pH
Displays just the pH reading in large digits.
3. Temperature
Displays just the temperature reading in large digits. If the temperature probe
is unplugged, the manual temperature setting is displayed with 1oC resolution,
eg : Man 25 oC
NOTE: The decimal point is replaced by a ∗if calibration has failed for that
parameter. (see sections 3.1, 4.1, 5.1, and 6.1), if the unit is initialised
(see section 9), or if the unit has lost its factory calibration (see section
10.1).

Page 8
3. Conductivity Calibration
3.1 Calibration Procedure
1. NOTE 1: A ∗in place of a decimal point indicates the mode is not calibrated.
2. NOTE 2: For correct calibration and measurement, the white plastic cover
must be in place covering the cell. It sets the volume of liquid to be measured.
3. Press the key if the meter is not already switched on.
4. Press the key until the meter is in Conductivity mode (see section 2.2).
5. Plug the Conductivity electrode into the Cond socket.
6. Rinse the Conductivity electrode in distilled water.
Shake off as much water as possible. Blot the outside of the electrode dry.
DO NOT BLOT THE ELECTRODE WIRES.
7. Zero Calibration
Let the electrode dry in air.
When the reading has stabilised at or near zero, press and hold the key for
2 seconds.
The ∗will not be removed after a zero calibration.
8. Standard Calibration
Allowable Conductivity standards are 2.76mS/cm for the standard k=1
electrode and 2.8mS/cm & 58.0mS/cm for the optional k=10 electrode. The
standard should be selected according to your range of interest.
Place the electrode into a sample of Conductivity standard, so that it is
immersed at least to the vent hole in the white plastic cover. The white plastic
cover MUST be in place for correct readings.
DO NOT place the electrode directly into the bottle of standard. Discard the
used sample of standard after use. It is advisable to use a narrow sample
vessel to minimise the use of standard solution.
When the reading has stabilised, press and hold the key for 2 seconds to
calibrate.
The ∗will now be replaced by a decimal point, if calibration was successful.
9. The MC-81 is now calibrated for Conductivity and is ready for use. When
taking sample measurements, the white plastic cover MUST be in place for
correct readings. The electrode must be immersed at least to the level of the
vent hole in the cover.

Page 9
3.2 Conductivity Calibration Notes
1. A Zero calibration should be performed at least monthly. In low conductivity
applications (where a zero error is particularly significant) a zero calibration
may have to be done weekly.
2. A Standard calibration should be performed at least weekly. Of course, more
frequent calibration will result in greater confidence in results.
3. Conductivity and Salinity calibration data is stored separately in memory.
Ensure that the MC-81 has been correctly calibrated for the mode in which it
will be used. The MC-81 does not require re-calibration when alternating
between Conductivity and Salinity modes, providing the instrument has been
correctly calibrated for both.
4. All calibration information is retained in memory when the MC-81 is
switched off, even when the battery is removed.
3.3 Conductivity Calibration Messages
1. If a Zero calibration has been successfully performed, the MC-81 will display
the following message.
Zero
Cal. OK
2. If a Standard calibration has been successfully performed, the MC-81 will
display the following message, and then the span of the electrode.
eg: Span then: Span
Cal. OK 100.0%
3. If a Standard calibration has failed, the MC-81 will display the following
message, and then the failed span value of the electrode.
eg: Span then: Span or: Unknown
Cal.Fail 60.0% Standard
Note that the decimal point is replaced by a ∗when a Standard calibration
fails.

Page 10
4. Salinity Calibration
4.1 Calibration Procedure
1. NOTE 1: A ∗in place of a decimal point indicates the mode is not calibrated.
2. NOTE 2: For correct calibration and measurement, the white plastic cover
must be in place covering the cell. It sets the volume of liquid to be measured.
3. Press the key if the meter is not already switched on.
4. Press the key until the meter is in Salinity mode (see section 2.2).
5. Plug the Conductivity electrode into the Cond socket.
6. Rinse the Conductivity electrode in distilled water. Shake off as much water
as possible. Blot the outside of the electrode dry. DO NOT BLOT THE
ELECTRODE WIRES.
7. Zero Calibration
Let the electrode dry in air.
When the reading has stabilised at or near zero, press and hold the key for
2 seconds.
The ∗will not be removed after a successful zero calibration.
8. Standard Calibration
Allowable Salinity standards are 2.00 ppK for the standard k=1 electrode and
2.0 ppK & 36.0 ppK for the optional k=10 electrode. The standard should be
selected according to your range of interest.
Place the electrode into a sample of Salinity standard, so that it is immersed at
least to the vent hole in the white plastic cover. The white plastic cover
MUST be in place for correct readings.
DO NOT place the electrode directly into the bottle of standard. Discard the
used sample of standard after use. It is advisable to use a narrow sample
vessel to minimise the use of standard solution.
When the reading has stabilised, press and hold the key for 2 seconds to
calibrate.
The ∗will now be replaced by a decimal point, if calibration was successful.
9. The MC-81 is now calibrated for Salinity and is ready for use. When taking
sample measurements, the white plastic cover MUST be in place for correct
readings. The electrode must be immersed at least to the level of the vent hole
in the cover.

Page 11
4.2 Salinity Calibration Notes
1. A Zero calibration should be performed at least monthly. In low Salinity
applications (where a zero error is particularly significant) a zero calibration
may have to be done weekly.
2. A Standard calibration should be performed at least weekly. Of course, more
frequent calibration will result in greater confidence in results.
3. Salinity and Conductivity calibration data is stored separately in memory.
Ensure that the MC-81 has been correctly calibrated for the mode in which it
will be used. The MC-81 does not require re-calibration when alternating
between Salinity and Conductivity modes, providing the instrument has been
correctly calibrated for both.
4. All calibration information is retained in memory when the MC-81 is
switched off, even when the battery is removed.
4.3 Salinity Calibration Messages
1. If a Zero calibration has been successfully performed, the MC-81 will display
the following message.
Zero
Cal. OK
2. If a Standard calibration has been successfully performed, the MC-81 will
display the following message, and then the span of the electrode.
eg: Span then: Span
Cal. OK 100.0%
3. If a Standard calibration has failed, the MC-81 will display the following
message, and then the failed span value of the electrode.
eg: Span then: Span or: Unknown
Cal.Fail 60.0% Standard
Note that the decimal point is replaced by a ∗when a Standard calibration
fails.

Page 12
5. pH Calibration
5.1 Calibration Procedure
1. Press the key if the meter is not already switched on.
2. Press the key until the meter is in pH mode. (See section 2.2)
3. Plug the pH electrode into the pH socket. For automatic temperature
compensation, plug the Conductivity sensor into the Cond socket. If the
Conductivity sensor is not connected, then the MC-81 will use manual
temperature compensation.
4. Ensure that temperature has already been calibrated, or manually set (see
sections 6.1 and 6.4). NOTE: If the decimal point in the temperature reading
is replaced by a ∗, then the temperature readout is not calibrated.
5. Remove the wetting cap from the pH electrode.
6. Rinse the pH and Conductivity electrodes in distilled water and blot them dry.
7. Ensure that you are using the buffers which have been selected for automatic
buffer recognition. See section 8for a detailed explanation.
Place both electrodes into a small sample of pH6.88 (or pH7.00) buffer, so
that the bulb and reference junction are both covered. DO NOT place the
electrodes directly into the buffer bottle. Discard the used buffer after use.
8. When the reading has stabilised, press and hold the key for 2 seconds to
calibrate. If a 1 point calibration has been performed, the ∗will not be
removed until a full 2 point calibration has been performed.
9. Rinse the pH and Conductivity electrodes in distilled water and blot them dry.
10.Place both electrodes into a small sample of pH4.00, pH9.23 or pH10.00
Buffer, so that the bulb and reference junction are both covered. DO NOT
place the electrodes directly into the buffer bottle. Discard the used buffer
after use.
NOTE: pH9.23 and pH10.00 buffers are highly unstable. Avoid using
these buffers if possible. Discard immediately after use.
When the reading has stabilised, press and hold the key for 2 seconds to
calibrate. The ∗will now be replaced by a decimal point, if calibration was
successful.
11.The MC-81 is calibrated for pH and is ready for use.

Page 13
5.2 pH Calibration Notes
1. A 1-point calibration should be performed at least weekly. In applications
where the electrode junction can become blocked, such as dairy products,
mining slurries etc, a 1-point calibration may have to be done daily.
2. A full 2-point calibration should be performed at least monthly. Of course,
more frequent calibration will result in greater confidence in results.
3. All calibration information is retained in memory when the MC-81 is
switched off, even when the battery is removed.
4. The MC-81 displays the value of the pH buffer that it has attempted to
recognise at calibration. Ensure that the buffer value displayed corresponds to
the buffer that you are using.
5.3 pH Calibration Messages
1. If a 1-point calibration has been successfully performed, the MC-81 will
display the following message, and then display the asymmetry of the
electrode.
eg: 1 Point then: Asy
6.88 OK 0.10 pH
2. If a 1-point calibration has failed, the MC-81 will display the following
message, then the failed asymmetry value of the electrode.
eg: 1 Point then: Asy Hi or: Asy Lo
6.88Fail 1.50 pH -1.50 pH
3. If a 2-point calibration has been successfully performed, the MC-81 will
display the following message, and then the asymmetry and slope of the
electrode.
eg: 2 Point then: Asy then: Slope
4.00 OK 0.10 pH 95.0%
4. If a 2-point calibration has failed, the MC-81 will display the following
message, and then the failed slope value of the electrode.
eg: 2 Point then: Slope Hi or: Slope Lo then: Check
4.00Fail 130.0% 70.0% Buffers

Page 14
6. Temperature Calibration
The temperature readout must be calibrated or manually set before attempting pH
calibration. The decimal point is replaced by a ∗if the reading is not calibrated.
6.1 Temperature Calibration
1. Press the key if the meter is not already switched on.
2. Press the key until the meter is in Temperature mode.
3. Plug the Conductivity sensor into the Cond socket.
4. Place the probe into a beaker of room temperature water, alongside a good
quality mercury thermometer. Stir the sensor and the thermometer gently to
ensure an even temperature throughout the beaker. The temperature sensor is
inside the stainless tip of the sensor, but better temperature response is
achieved by immersing the sensor to at least the level of the vent hole in the
white plastic cover.
5. When the reading has stabilised, press and hold the key for 2 seconds.
6. The reading from the probe is now displayed on the top line, and the value
you are going to set is on the bottom line.
eg: 25∗∗0 oC
↑↑ 26.0↓↓
7. Press the and keys until the bottom line shows the same temperature
as the mercury thermometer.
8. Press the key to calibrate the temperature readout.
Alternatively, press the key to abort temperature calibration.
6.2 Calibration Notes
1. Temperature calibration information is stored in memory when the meter is
switched off, even if the battery is removed.
2. Temperature does not need to be re-calibrated unless the Conductivity sensor
is replaced or the meter is initialised.

Page 15
6.3 Calibration Messages
1. If a temperature calibration has been successfully performed, the MC-81 will
display the following message and then the offset value of the probe.
eg: Temp then: Offset
Cal. OK 1.0oC
2. If a temperature calibration has failed, the MC-81 will display the following
message, and then the failed offset value of the probe.
eg: Temp then: Offset
Cal.Fail 10.5oC
6.4 Manual Temperature Setting
1. Press the key if the meter is not already switched on.
2. Press the key until the meter is in Temperature mode.
3. Manual temperature setting is only available if the Conductivity sensor is not
connected.
4. Press and hold the key for 2 seconds.
5. The display should now look like this:
Man.Temp
↑↑ 25.0↓↓
6. Press the and keys until the bottom line shows the temperature which
you wish to set. This value should be the same as the temperature of the
solution you are measuring.
Press the key to set the temperature.

Page 16
7. Battery Saver Function
The MC-81 is equipped with a battery saver function. If no button has been
pressed for five minutes, the unit beeps and flashes the display for 20 seconds,
and then shuts off. This function can be disabled for continuous use.
To enable or disable the battery saver function:
1. Press the key if the meter is not already switched on.
2. With the meter already switched on, press and HOLD the key for 3
seconds.
3. The display should now look like this:
Either: :ON ↑↑↓↓ or: :OFF ↑↑↓↓
9.00V 9.00V
4. In this mode, use the or keys to toggle the battery saver function on or
off.
NOTE: The display also shows the battery volts. This gives the operator an idea
of how much battery life is remaining. The symbol flashes when the
battery volts drops below 7.50 volts. At 6.00 volts the meter turns itself
off.
5. When you have set the battery saver function to the desired position, press the
key to return to normal measurement mode. The setting is kept in memory
when the meter is switched off, even if the battery is removed.

Page 17
8. Selecting Buffers for Auto Buffer Recognition
The MC-81 is factory set to automatically recognise pH4.00, pH6.88 and pH9.23
buffers. However, some users may prefer to use pH7.00 instead of pH6.88 and
pH10.00 instead of pH9.23. The following procedure describes how to set which
of these buffers are automatically recognised at calibration.
1. Switch the meter OFF with the key.
2. Press and HOLD the key while switching the meter back on.
3. Release the key when the message, “Select Buffer” is displayed.
4. The display will now show the currently selected primary buffer.
Use the or keys to alternate between pH6.88 and pH7.00 buffers.
5. Press the key to save the primary buffer.
6. The display will now show the currently selected high pH buffer.
Use the or keys to alternate between pH9.23 and pH10.00 buffers (the
display shows pH10.0 for the latter but this buffer is stored as pH10.00).
7. Press the key to save the high pH buffer.
8. The buffer recognition setting is kept in memory when the meter is switched
off, even if the battery is removed. The buffers are re-set to pH6.88 and
pH9.23 during initialisation.
NOTE: pH6.88 buffer is a DIN 19266 and NBS Primary-standard pH solution.
Its use is highly recommended for the most accurate possible results. If
pH7.00 buffer is used, ensure that it is manufactured to 0.01pH
accuracy. pH7.00 buffer has a buffer capacity less than half that of
pH6.88 buffer and is therefore much less stable.

Page 18
9. Initialising the MC-81
If the calibration settings of the MC-81 exceed the allowable limits, the unit may
need to be initialised to factory default values. This action may be required if one
or both of the sensors are replaced.
To initialise the MC-81:
1. Switch the MC-81 off, by pressing the key.
2. Press and hold the key while switching the MC-81 the on with the
key.
3. The following messages should be displayed:
Memory then: You MUST then: TPS MC81
Reset ! Re-Cal. Con Sal pH
4. The meter then displays Conductivity and pH. Note that the decimal points
have been replaced with a ∗, to indicate that the unit requires re-calibration.
NOTE: When the MC-81 is initialised, the automatically recognised buffers are
re-set to pH4.00, pH6.88 and pH9.23. See section 8if you prefer to use
pH7.00 instead of pH6.88 and pH10.00 instead of pH9.23.

Page 19
10. Troubleshooting
10.1 General Error Messages
Error Message Possible Causes Remedy
Factory
Cal. Fail
See
Handbook
The EEPROM chip which
contains the factory calibration
information has failed.
The unit must be returned to
TPS for service.
•Conductivity and Salinity
readings will be accurate after
a full two point calibration.
•pH readings will be accurate
after a 2-point calibration (use
manual temperature
compensation).
•Temperature readings may be
up to ±5oC incorrect.
Memory
Failed
Calib.
Lost
Memory
Reset !
You MUST
Re-Cal.
User calibration settings have
been lost or corrupted. Re-calibrate the instrument.
Both a Zero and a Standard
calibration will be required for
Conductivity and Salinity (see
sections 3.1 and 4.1). A full 2
point calibration will be
required for pH (see section
5.1) and a 1 point calibration
for temperature (see section
6.1).
Meter displays the
word OFF, and
switches off.
Battery is below 6.00 volts. Replace the battery.
Meter will not turn
on. Battery is exhausted. Replace the battery.
Flashing
symbol. Battery is below 7.50 volts. Replace the battery soon. Note
that the unit will switch itself
off when the battery falls below
6.00 volts.