IQ Scientific Instruments IQ160 User manual

1
Waterproof Handheld Meters
IQ160 pH Meter
IQ170 pH/mV/Temperature/Conductivity
TDS/Salinity Meter
IQ340 Conductivity Meter
IQ350 Conductivity/TDS/Salinity Meter

2
Conductivity Calibration
Quick Start Guide
Model IQ170, IQ340 and IQ350
Connect probe to meter.
Put probe in first cali-
brating solution.
Press ON/OFF to turn
on meter.
If necessary, press
CON until COND icon
is seen on the display.
Press CAL.The conductivity value
will flash. Press the ▲
or ▼key until the
display matches the
calibrating solution.
Press ENTER
Rinse probe in
deionized water
and place in
sample.

1
pH Calibration
Quick Start Guide
Model IQ160 and IQ170
Connect probe to me-
ter.
Put probe in first
calibrating buffer.
Press ON/OFF to
turn on meter.
If necessary, press
pH until pH icon is
seen on the display.
Press CAL.If necessary, press
the ▲or ▼key
until display
matches first buffer
value.
Press ENTER and
wait until the large
number display stops
flashing.
When complete,
meter will display
the next stored
buffer value. CAL 2
will be displayed
Rinse probe in deion-
ized water and place
in second calibrating
buffer.
If necessary, press
the ▲or ▼key
until display
matches second
buffer value.
Press ENTER and
wait until the large
number display stops
flashing.
Rinse probe in
deionized water and
place in sample.
1

2
INTRODUCTION
IMPORTANT NOTICE
SAFETY PRECAUTIONS
IF THE METER IS USED IN A MANNER OTHER THAN AS DESCRIBED,
THE SAFETY AND
PERFORMANCE OF THE METER CAN BE IMPAIRED.
IF THE SEAL ON THE BACK OF THE METER IS TAMPERED WITH, THE
WARRANTY IS
IMMEDIATELY VOIDED.
The IQ160 pH meter and IQ170 multi-parameter meter accept both traditional
style glass sensor electrodes with BNC connectors and non-glass pH probes
with ISFET (Ion Sensitive Field Effect Transistor) silicon chip sensors. The
IQ170 multi-parameter meter, and the IQ340 and IQ350 meters accept
conductivity probes.
Throughout this manual, non-glass pH probes with silicon chip sensors will be
referred to as “ISFET” probes. Glass sensor pH electrodes will be referred to
as “BNC” probes. The pH meters have a standard BNC connector for
attachment of glass sensor pH electrodes and a separate connector for ISFET
probes.
The pH meters are designed to use only one pH electrode (either a BNC pH
probe or an ISFET pH probe) at a time. The meter automatically identifies
which type of electrode is attached when the meter is turned on. If both
ISFET and BNC probes are attached at the same time, errors may occur.
Always turn off the meter when changing electrodes. NOTE: Both pH and
conductivity probes can be attached simultaneously to the model IQ170.
ESTIMATED LIFE OF AN ISFET SENSOR pH PROBE
Depending upon the application, the expected life of an ISFET probe is
approximately 18 months. The reference electrode contains a KCl gel, which
becomes increasingly diluted with usage and time. The reference is sealed
and is not refillable. When it becomes difficult to calibrate (pH buffer value
does not stop flashing during calibration or takes an excessively long time to
stop flashing), the probe should be replaced. A probe that is dirty,
miscalibrated, or has reached the end of its useful life will give an error
message E06 on the meter display. Your ISFET probe is warranted to be free
from manufacturing defects for six (6) months from the date of
purchase.

3
Table of Contents
Quick Start Guide — Conductivity Calibration. . . . . . . . . . . . . . . . . . . . . i
Quick Start Guide — pH Calibration. . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Section 1: Techniques and Tips for Best Performance. . . . . . . . . . . . . . . 4
Section 2: Specifications. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Section 3: Instrument Features. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Section 4: Keypad Functions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Section 5: Probes and Connections. . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Section 6: Probe Cleaning. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Section 7: pH Calibration (Model IQ160 and IQ170 Only). . . . . . . . . . . . . 22
Section 8: Conductivity and TDS Calibration
(Model IQ170, IQ340, and IQ350 only). . . . . . . . . . . . . . . . . . . . . . . . .
26
Section 9: Setup Functions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
pH Resolution. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
2 or 3 Point pH Calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
Stabilization Lock. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
Temperature Display in oC or oF. . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
Manual Temperature Compensation for Glass Electrodes. . . . . . . . . . . 35
Conductivity Temperature Compensation Coefficient. . . . . . . . . . . . . . 37
Reviewing Conductivity and TDS Calibration Points. . . . . . . . . . . . . . . 38
Conductivity Temperature Normalization . . . . . . . . . . . . . . . . . . . . . 40
TDS Conversion Factor. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
Setting TDS Units . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
Setting Salinity Units. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
Sound. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
Clear Glass pH, Conductivity, and TDS Calibration Points. . . . . . . . . . . 48
Section 10: Troubleshooting Guide. . . . . . . . . . . . . . . . . . . . . . . . . . . . 49
Section 11: Error Codes. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52
Conductivity Probe Cell Constants. . . . . . . . . . . . . . . . . . . . . . . . . . . 45
Meter Automatic Shutoff Time. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47

4
SECTION 1:
Techniques and Tips for Best Performance
DO
DO: (ISFET non-glass probe ONLY) Soak the probe in pH 7.00 buffer for
at least five minutes if the probe is new or has been stored dry for an ex-
tended period. This will hydrate the sensor and dissolve any reference mate-
rial, which may have crystallized on the sensor surface. NOTE: If a probe is
in regular use, pre-soaking is not necessary
DO: (ISFET non-glass probe ONLY) Clean the probe regularly with a
toothbrush and mild detergent.
DO: (ISFET non-glass probe ONLY) STORE THE PROBE DRY with the black
protective cap covering the probe tip. No electrode storage solution is re-
quired.
DO: (BNC probe ONLY) Store the probe in electrode storage solution.
DO: Always begin each measuring session with a two-point calibration. Up-
date often with one-point, two-point or three point calibrations.
DO: Use fresh buffers and deionized rinse solution.
DO: Use buffer solutions with pH values no greater than three pH units apart.
Buffers should bracket the anticipated values of the samples to be measured.
DO: Use deionized water to rinse residual buffer and sample solutions from
the probe after calibration and measurement.
DO: Calibrate at the same temperature as the sample solution. Although the
meter has automatic temperature compensation, best results will be achieved
if the calibration buffers and sample are the same temperature.
DO: Keep the connectors clean and dry. Dirty or damp connectors can cause
unstable readings.

5
DO NOT
DO NOT: change pH probe types (switch between BNC and ISFET probes)
while the meter is turned on. Always turn off the meter before changing
probes.
DO NOT: simultaneously use ISFET and BNC probes. Only have one type of
probe attached to the pH meter at a time. NOTE: Both pH and conductivity
probes can be simultaneously attached to the IQ170 multi-parameter meter.
DO NOT: store an ISFET probe in solution or use for long-term pH measuring
applications. Unlike BNC electrodes, stainless steel ISFET electrodes should
be stored dry. Extended immersion will shorten the life of the probe.
DO NOT: leave an ISFET probe uncapped for long periods of time. Always
place the protective cap over the probe tip when finished measuring.
DO NOT: allow oil, fat, food particles, starch, protein, or other materials to
remain on the probe tip after use.
DO NOT: use a sharp metal object (needle, pin, etc.) to clean the sensor
surface.
DO NOT: take readings in direct sunlight. Direct sunlight may cause unsta-
ble readings or difficulty in calibration. Call IQ Scientific Instruments or your
Authorized Dealer for optional light shields.
DO NOT: use the probe in an environment that will damage the sensor, such
as hydrofluoric acid or abrasive samples.
DO NOT: use the probe in environments that will damage the epoxy materi-
als used in the probe tip. Avoid acetone, toluene, methylene chloride, xylene,
and other strong organic solvents.
DO NOT: use in environments with static electricity. Electrostatic discharge
may permanently damage the probe.
DO NOT: expose the ISFET probe to repeated temperature extremes (60 oC
or higher). Do not use the probe for applications that require the probe to
cycle between hot and room temperature samples.
DO NOT: put any other active measurement devices in buffers or samples
while measuring pH or conductivity. Even if another device is not actually
turned on, AC power interference can still occur.

6
SECTION 2: Specifications
Table 1: Specifications
pH mV Temperature Conductivity TDS Salinity
Range 0.00 – 14.00 Autoranging
±199.9 mV
±1999 mV
-5.0 to 105.0 °C
20.0 to 199.9 °F
Autoranging
0.00 to 19.99 µS
20.0 to 199.9 µS
200 to 1999 µS
2.00 to 19.99 mS
20.0 to 199.9 mS
Autoranging
0.00-9.99 ppm
10.0-99.9 ppm
100-999 ppm
1.00-9.99 ppt
10.0-99.9 ppt
100-200 ppt
Will also display in mg/L
0.00-199.9 mg/l
200-1999 mg/l
2.00-19.99 g/l
20.0-50 g/l
0-42 ppt
Resolution 0.01 pH Autoranging
0.1 and 1
0.1 °C
0.1 °F
0.01 µS
0.1 µS
1 µS
0.01 mS
0.1 mS
0.01 ppm
0.1 ppm
1 ppm
0.01 ppt
0.1 ppt
1 pt
0.1 mg/l
1 mg/l
0.01 g/l
0.1 g/l
0.1 ppt
Accuracy ±0.01 pH ±0.1 mV ±0.5 °C ± 1% full scale or ±1
digit
± 1% full scale or ±1 digit +/- 0.1 ppt
(-2 to 35 °C)
Calibration Up to three points
With automatic
buffer recognition
1.68,4.01, 6.86,
7.00, 9.18, 10.01,
12.45
None Offset in 0.1 °C
increments
Up to five points Up to five points None (derived from
conductivity)

7
Sound:
Sounds will occur as follows:
• Three short beeps any time measurement stability is
reached during calibration mode, regardless of the
Stabilization Lock setting.
• Three short beeps when stabilization is reached when
in Stabilization Lock ON mode. The READY icon will
illuminate. (NO beep if Stabilization Lock is in the OFF
mode)
• Two long beeps if an error condition occurs. An error
code will be displayed.
• Audible click on key tap.
Automatic Ranging of mV Display
From -199.9mV to +199.9mV the meter will display 0.1
resolution. From 200mV to 1999mV the meter will display 1
mV resolution.
Automatic Ranging of Conductivity, TDS and Salinity
values.
Auto ranges between the five display ranges.
Automatic Detection of Cell Constant. The meter will
automatically detect the cell constant of a conductivity
electrode.
Auto Power off: Will automatically power off 20 minutes
after last key press.
LED Display Light:
LED light goes on when the light button is pressed. Light stays
on for 2 minutes after the last keystroke.
Conversion factor for TDS: User adjustable.

8
Temperature Compensation:
Glass pH Temperature Compensation
If the meter is in the glass pH mode and a temperature
probe is plugged in to the 3.5mm phono jack, the
meter defaults to Automatic Temperature
Compensation (ATC). If no temperature probe is
detected it defaults to Manual Temperature
Compensation at 25 °C.
ISFET pH Temperature Compensation
ISFET pH is always automatically temperature
compensated using the thermistor built-in to the probe.
Conductivity Temperature Compensation
The internal temperature sensor in the conductivity
probe is used for conductivity temperature
compensation. The Conductivity automatic temperature
compensation coefficient is user selectable. Default is
2% per degree C.
NOTE ON pH ATC: Automatic Temperature Compensation
(ATC) for pH only occurs when using an ISFET pH probe (built-
in temperature sensor) or when a BNC pH electrode is used
with the separate temperature plug attached. After calibration
is complete and the meter is in the pH mode, the pH values
displayed will be temperature compensated. If no
temperature plug is attached when using a BNC electrode,

9
The table below shows the pH values of buffers at various
temperatures.
Nominal
Value
25 oC 0 oC 5 oC 10 oC 20 oC 30 oC 40 oC 50 oC
1.68 1.67 1.67 1.67 1.67 1.68 1.69 1.71
4.01 4.00 4.00 4.00 4.00 4.01 4.03 4.06
6.86 6.98 6.95 6.92 6.87 6.85 6.84 6.83
7.00 7.12 7.09 7.06 7.01 6.99 6.97 6.97
9.18 9.46 9.40 9.33 9.23 9.14 9.07 9.02
10.01 10.32 10.25 10.18 10.06 9.97 9.89 9.83
12.45 13.42 13.21 13.00 12.63 12.29 12.04 11.70
Table 2: Temperature Compensation Tables

10
13
12
14
15
16
1
2
3 4
5
22
6
7
9
11
17
18
19
20
21
23
SECTION 3: INSTRUMENT FEATURES
Display Features
Item
No.
Description IQ160 IQ170 IQ340 IQ350
1 ISFET probe indicator. ISFET is displayed when
the meter has detected the presence of an ISFET
probe. (Model IQ160, Model IQ170)
• •
2 Indicates that the meter is receiving input from the
pH probe. Will be displayed in both pH and mV
reading modes. (Model IQ160, Model IQ 170)
• •
3 The meter is in the Conductivity reading mode
(Model IQ170, IQ340, IQ350)
• • •
4 The meter is in the Salinity reading mode (Model
IQ170, Model 350)
• •
5 The meter is in the TDS reading mode (Model
IQ170, Model IQ350)
• •
6 TDS or Salinity value is in mg/L or g/L (Model
IQ170, IQ350)
• •
7 TDS or Salinity value is in ppm (Model IQ170,
IQ350)
• •
8 TDS or Salinity value is in ppt (Model IQ170,
IQ350)
• •
9 The displayed value is a mV value • •
10 The displayed value is a pH value • •
11 The Conductivity value is in mS • • •
10
8

11
12 The Conductivity value is in µ S • • •
13 The Salinity value is in % • •
14 The pH, Conductivity, TDS or Salinity value is
automatically temperature compensated.
• • • •
15 Indicates the meter is in a calibration mode.
When calibrating pH, indicates the current
point of a multiple point calibration.
• • • •
16 The Temperature value is in oF • • • •
17 The Temperature value is in oC • • • •
18 Low battery power indicator • • • •
19 Meter is in SETUP mode • • •
20 Temperature value • • • •
21 Main Display value • • • •
22 Stable reading (Endpoint) in pH, Conductivity,
TDS or Salinity
• • • •
23 The display is in HOLD mode • • • •
Item
No.
Description IQ160 IQ170 IQ340 IQ350

12
Model IQ170 shown
SECTION 4: Keypad Functions

13
Table 4: Keypad Functions
Key Action
ON/OFF Turns on/off meter
pH Displays pH
mV Displays mV
Light Turns on light for two minutes
TDS Displays estimated TDS. If no
Conductivity probe is attached, will not go
into TDS mode.
COND Displays Conductivity. If no Conductivity
probe is attached, will not go into
conductivity mode.
SAL Displays Salinity. If no Conductivity
probe is attached, will not go into Salinity
mode.
HOLD Toggles HOLD mode. Readings “frozen”
until HOLD key pressed again to release
display. Only operates in measurement
modes.
CAL Puts into the pH calibration mode. If the
meter is in the Conductivity or TDS mode
it will put it in the Conductivity or TDS
calibration mode.
▲Scrolls pH buffer values when in pH
calibration mode. Scrolls values in COND
or TDS calibration mode. Used to view
setup screens.
▼Scrolls pH buffer values when in pH
calibration mode. Scrolls values in COND
or TDS calibration mode. Used to view
setup screens.
SETUP Enters setup mode
ENTER Used to confirm values to begin
calibration.
IQ160
•
•
•
•
•
•
•
•
•
•
IQ170
•
•
•
•
•
•
•
•
•
•
•
•
•
IQ340
•
•
•
•
•
•
•
•
•
IQ350
•
•
•
•
•
•
•
•
•
•
•

14
SECTION 5: Probes and Connections
IQ170 multi-parameter meter
1. Conductivity
probe connector
2. BNC Connector for
glass pH electrode
3. Phono jack for glass pH elec-
trode temperature sensor
4. ISFET pH
probe connector
Connector
dust caps
IQ160 pH Meter
IQ340 and IQ350
Conductivity Meters
CAUTION: Do not operate meter with both an ISFET and a
BNC probe attached.

15
Probe connections
Glass and ISFET pH probes
The Model IQ160 and IQ170 meters accept two different
types of pH sensing technologies, ISFET pH probes and glass
electrodes (BNC probes). The meters automatically identify
whether a BNC or ISFET pH probe is attached when the meter
is first turned on. Do not attach both types of pH probe at the
same time. The meter is designed to use only one type of pH
probe at a time. Always turn off the meter when changing
probes.
pH and Conductivity Probes
The Model IQ170 multi-parameter meter allows both a pH
probe (either glass or ISFET) and a conductivity probe to be
connected simultaneously.
1. Conductivity Probe.
The IQ170, IQ340 and IQ350 meters accept conductivity
probes of different cell constants. The cell constant is
automatically detected by the meter.
2. BNC Connector for Probes.
The IQ160 and IQ170 multi-function meter accepts any
pH, ORP, or Ion Selective Electrode with BNC connector.
Be sure that both the receptacle on the meter and the
connector on the probe are clean and dry; wet or dirty
connections may cause unstable readings.
3. Temperature Probe Connector for use with BNC
Probes.
The temperature probe uses a 3.5 mm phono jack. When
a temperature probe is connected, the meter will
Automatically Temperature Compensate (ATC) pH values.
Contact IQ Scientific Instruments for temperature probes
or pH electrodes with built-in temperature sensors.
4. ISFET pH Probe Connector.
The Model IQ160 and IQ170 multi-function meter accepts
ISFET non-glass pH probes. The temperature sensor is
built-in to the ISFET probe so a separate temperature
probe is not required

16
The ISFET probe connector and conductivity probe connector
are keyed differently to prevent attaching a probe to the
wrong connector.
All of the connectors, including the 3.5mm phono jack are
sealed to protect flooding of the interior meter in the event of
submersion.
NOTE: If the meter is submerged, the interior of the 3.5mm
phono jack may fill with water although the interior of the
meter itself is sealed. If the 3.5 mm phono jack is flooded, it
must be dried immediately. Best solution is to invert the me-
ter to allow any water to run out of the connector.
Automatic pH Probe Detection (Model IQ160 and IQ170
only). If the instrument does not detect the presence of an
ISFET probe, it defaults to glass pH electrode mode and reads
pH from the BNC connector.
Automatic Conductivity Probe Detection (Model IQ170,
IQ340 and IQ350): If a conductivity probe is detected,
conductivity measurement and calibration is enabled. The cell
constant of the conductivity probe is automatically detected.
The following cell constants are recommended for the
following applications:
Automatic Detection of Cell Constant. (Model IQ170,
IQ340 and IQ350). The meter will automatically detect the
cell constant of a conductivity electrode. No user setup is
required.

17
Temperature probe for use with glass pH (Model
IQ160 and IQ170): IQ Scientific Instruments BNC probes
have a built-in temperature sensor and the probe cable has
a “Y” with a BNC connector and a 3.5mm phono jack. If the
instrument detects the presence of a temperature probe
plugged into the 3.5mm phono jack, the meter defaults to
ATC for the glass pH measurement.
ISFET pH: IQ Scientific instruments’ silicon chip pH sensor
(ISFET) probes have a built-in temperature sensor. If an
ISFET pH probe is detected, the BNC and the 3.5mm phono
jack are disabled and the ISFET probe pH measurement and
calibration is enabled. The internal temperature sensor in the
ISFET probe is used for pH temperature compensation.
ISFET pH is always automatically temperature compensated
(ATC).
Cell Constant (k) Recommended Range Application Notes
K 0.3 0 to 100,000 µS General purpose. Dirty
samples.
Altem body, anti-
fouling flush tip.
Stainless steel contacts
K 0.5 0 to 100,000 µS General purpose Graphite body.
K 1 0 to 120,000 µS High accuracy Glass body, platinum
bands
K10 0 to 200,000 µS High conductivity
samples, brackish
water, seawater
Epoxy body, platinum
bands
Table 5: Cell Constants

18
SECTION 6: Probe Cleaning
Cleaning and Reconditioning ISFET
(non-glass) Probes
Recommended cleaning solution for any probes used in
samples containing protein: IQ Scientific Instruments pepsin-
based cleaning solution, Part #PCS50.
Cleaning with Detergent
CAUTION: Do not use metal
objects such as pins or
paperclips to clean the sensor.
The sensor can be permanently
damaged with aggressive
abrasion of the sensor surface.
Reconditioning with Warm Buffer
ISFET probes are designed to be stored dry and have a
virtually unlimited shelf life; however an extended period of
dry storage can crystallize the KCl gel at the reference
junction. Heat pH 7.00 buffer to between 45 oC and 60 oC
(115 oF and 140 oF). Soak the probe for 2 minutes. Place the
probe in room temperature pH 7.00 buffer and allow to cool.
CAUTION: Do not use the probe as a
thermometer to determine if the buffer is
above 60 oC. Sudden immersion in
excessively hot water may permanently
damage the probe.
This manual suits for next models
3
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