Delta OHM HD 9213-R1 Instruction Manual

HD 9213-R1

INSTRUCTION MANUAL

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HD 9213-R1

– 29 –

HD 9213-R1

ENGLISH

MICROPROCESSOR CONDUCTIVITY
METER - THERMOMETER

1 LCD Display
2 Battery symbol
3 Symbol indicating that the reading is in milliSiemens
4 Symbol indicating that the reading is in microSiemens
5 Key for selecting temperature reading in °C or °F
6 Key for enabling the calibration function
7 Key that increases the value to be set during the para-

meter setting phase

8 Symbol indicating that the temperature reading is in °F

9 Symbol indicating that the temperature reading is in °C
10 ON/OFF key for switching the instrument on and off
11 Key for selecting conductivity measurement
12 Key that decreases the value to be set during the para-

meter setting phase

13 Connector for the input of the conductivity and tempera-

ture probes, DIN 45326 8-pole male connector

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– 30 –

ON

OFF

RESET

ON

OFF

ENGLISH

– 31 –

Symbols lit

besides the numbers

Key

Description

All the symbols are lit for
a few seconds after swit­ching on

The battery symbol
flashes

K

Switches the instrument on and off.
The instrument switches itself off
automatically about 8 minutes after
the ON/OFF key has been pressed.
It is provided with an auto power off
function.

If the °C/°F key is held down simul­taneously with the ON/OFF key
when switching on, the AUTO
POWER OFF function is disabled
and power is supplied without inter­ruption. To switch off, press the
ON/OFF key. The battery symbol
flashes during this function.

When switching on, one of the
three messages appears after all
the symbols. The message that
appears indicates for what type of
calibration the instrument is set, or
what type was set previously.

Next appears one of the following
messages. The message that
appears indicates for what cell con­stant (0.1 - 1.0 - 10), if any, the
instrument is set, or what constant
was set previously.

+

°C

°F



CAL

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Symbols lit

besides the numbers

Key

Description

Key for selecting the temperature
reading in °C or °F.
The tsymbol indicates the unit
chosen.
When used in combination with
others, the key also carries out
other functions.

When this key is pressed, if a probe
for conductivity measurement is
connected, the instrument measu­res the conductivity of the liquid
being tested, giving a reading that
may be expressed in µS or in mS.
When used in combination with
others, the key also carries out
other functions.

When pressed during conductivity
measurement, this key enables the
automatic or manual calibration
function.

These keys increase 1or decrease

2

the value indicated on the
display when pressed during auto­matic or manual calibration, setting
of the cell constant factor, setting of
the reference temperature of the
measurement, setting of the tempe­rature compensation value, or cali­bration of the instrument.

µSmS°F °C

µSmS°F °C

µSmS°F °C

µSmS°F °C

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GENERAL INFORMATION

The HD 9213-R1 is normally supplied with the combined 4-electrode and
temperature probe SPT13.
The cell measurement area is bounded by a Pocan tube. A positioning
key, directs correctly the insertion of the tube into the probe. To clean the
probe, pull the tube along the probe axle. It is not possible to take mea-

surements without this tube.

The instrument may be fitted with 2-electrode conductivity probes with cell
constant 0.1 - 1 - 10; they may also be fitted with temperature measuring
probes of the series TP 9.. in various configurations and degrees of preci­sion.

FUNCTIONS

1 - AUTO POWER OFF DISABLE

To disable the automatic cut-out function, proceed as follows: switch on
the instrument with the ON/OFF key, holding down the °C/°F key until
all the symbols disappear, then release the °C/°F key. The Ksymbol
flashes.

2 - REFERENCE TEMPERATURE 20°C or 25°C

To set the reference temperature, proceed as follows: switch on the
instrument with the ON/OFF key, holding down the CAL key until all the
symbols disappear, then release the CAL key. Using the 1or 2key,
set the desired value r20 or r25, which stand for 20°C or 25°C. To quit
this routine, press the  key.

3 - SELECTING THE CELL CONSTANT

To select the cell constant for probes with 2 electrodes, proceed as fol­lows: switch on the instrument with the ON/OFF key, holding down the

 key until all the symbols disappear, then release the  key. One of

the messages c 0.1, c 1.0 or c 10 appears on the display. Using the

1

and 2keys, set the desired cell constant c 0.1, c 1.0 or c 10 which

stand for cell constant 0.1 or 1 or 10.
To quit this routine, press the  key.

CALIBRATION CODES OF THE TEMPERATURE PROBES

The instrument has 5 codes, 3 of which are used for calling calibrations
while 2 are calibration procedures. They are identified as follows:

C1: The instrument operates with the original calibration performed in the

Delta Ohm workshop. It cannot be altered.

C2: The instrument operates with temperature calibration of the instrument

alone, performed with a suitable simulator.

C3: The instrument takes measurements and operates with a certain tem-

perature probe; the calibration of instrument and probe is the one that
gives the most precise results.

C6: Procedure for calibrating the temperature section of the instrument,

performed with a suitable calibrator.

C8: Procedure for calibrating the instrument together with a certain tempe-

rature probe. The two points on the scale are calibrated with a calibra­tion furnace.

PROCEDURE FOR ENABLING AND CALLING ONE OF
THE THREE STORED CALIBRATIONS

To select codes C1, C2 or C3, proceed as follows: switch on the instru­ment with the ON/OFF key, holding down the  key and the CAL key until
all the symbols disappear. The message CAL then appears, followed by
00; using the 1and 2keys, set the desired code, that is C1, C2 or C3.
Confirm by pressing the CAL key. The Ksymbol flashes and the CAL
message remains fixed for a few seconds; the instrument then switches off
and the procedure is complete.

PROCEDURE FOR CALIBRATING THE TEMPERATURE
SECTION OF THE INSTRUMENT AND FOR STORING
CALIBRATION

To calibrate the instrument temperature code C6, proceed as follows:
switch on the instrument with the ON/OFF key, holding down the  key
and the CAL key until all the symbols disappear. The message CAL then
appears, followed by 00; using the 1and 2keys, set the code C6.
Press the CAL key.

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Simulate 0°C at the instrument input with a suitable simulator; using the

1

and 2keys, set on the display the correct value which corresponds to the
first calibration point.
Next simulate the second calibration point and set the correct value on the
display using the 1and 2keys. Press the CAL key to store the calibration
performed.

PROCEDURE FOR CALIBRATING THE INSTRUMENT
WITH ITS TEMPERATURE PROBE AND FOR STORING
THE DATA

To calibrate the instrument with its temperature probe, code C8, proceed
as follows: switch on the instrument with the ON/OFF key, holding down
the  key and the CAL key until all the symbols disappear. The message

CAL then appears, followed by 00; using the 1and 2keys, set the code
C8.

Connect the desired temperature probe to the instrument; insert it in the
calibration furnace at 0°C corresponding to the first calibration point, then
set the correct value on the display using the

1

and 2keys.
Insert the temperature probe in the calibration furnace for the second cali­bration point, then set the correct value corresponding to the second cali­bration point on the display, using the

1

and 2keys.

Press the CAL key to store the calibration performed.

CALIBRATING THE CONDUCTIVITY SECTION OF THE
INSTRUMENT

The instrument is able to recognize two standard calibration solutions: a

0.1 - mole solution of KCl and a 0.01 - mole solution of KCl. These solu­tions are on sale in specialized shops or they may be prepared by fol­lowing the procedures given below. Calibration is automatic when using
one of these two solutions.

Manual calibration is possible using a standard solution with a diffe­rent conductivity from the solution used in automatic calibration.

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PREPARATION OF STANDARD CALIBRATION
SOLUTIONS

Dry the potassium chloride (KCl) at 105...120°C (221...248°F) for two
hours. For a 1-mole solution, dissolve 74.555 g KCl in one litre of demine­ralized water with conductivity less than 3 µS/cm. For a 0.1-mole solution,
dissolve 7.456 g KCl in one litre of demineralized water with conductivity
less than 1 µS/cm. For a 0.01-mole solution, add 100 millilitres of 0.1-mole
solution to 900 millilitres of demineralized water with conductivity less than
1 µS/cm.

c

0.01 M 0.1 M 1 M

T

18°C 1.225 mS/cm 11.19 mS/cm 98.24 mS/cm
19°C 1.251 mS/cm 11.43 mS/cm 100.16 mS/cm
20°C 1.278 mS/cm 11.67 mS/cm 102.09 mS/cm
21°C 1.305 mS/cm 11.91 mS/cm 104.02 mS/cm
22°C 1.332 mS/cm 12.15 mS/cm 105.94 mS/cm
23°C 1.359 mS/cm 12.39 mS/cm 107.89 mS/cm
24°C 1.386 mS/cm 12.64 mS/cm 109.84 mS/cm
25°C 1.413 mS/cm 12.88 mS/cm 111.80 mS/cm

AUTOMATIC CALIBRATION

Automatic calibration is possible with a 0.1-mole (or 0.01-mole) solution of
KCl. The temperature of the solution must be between 15°C (59°F) and
30°C (86°F), otherwise the error signal “E3” appears.

a) Switch on the instrument by pressing the ON/OFF key.
b) Immerse the conductimetry cell in the sample solution so that the elec-

trodes are covered.

c) Shake the probe gently so that any air inside it will escape.
d) Press the CAL key. The conductivity value of the solution at the probe

temperature appears on the display. For example 1278 µS at 20°C
(68°F) and the µS (or mS) symbol flashes.

e) Press the CAL key again to confirm the value displayed (or adjust this

value with the 1and 2keys before pressing CAL again). The µS (or
mS) symbol stops flashing.

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Note: when leaving calibration mode the value on the display may increase
or decrease. This happens only if the temperature of the liquid is different
from 20°C (25°C) (which is the temperature at which the conductivity values
are normalized). In fact, when the temperature is different from 20°C (25°C)
the instrument indicates the conductivity value with the temperature com­pensation made according to the αTcoefficient, set by the user, which may
be considerably different from the value of the calibration solution.

f) Rinse the probe in water. If measurements are later made at low con-

ductivity, we advise rinsing it in distilled or bidistilled water.

At this point the instrument is calibrated and ready for use.

MANUAL CALIBRATION

Manual calibration is possible using solutions with any conductivity. Howe­ver it is necessary to know the conductivity of the solution at the tempera­ture at which calibration is to be carried out. Follow these instructions:

a) Immerse the conductimetry cell in the solution with known conductivity

so that the electrodes are covered with liquid. Switch on the instrument
by pressing the ON/OFF key.

b) Press the αTkey. The temperature coefficient used for calculating the

temperature compensation in conductivity measurements is displayed.
Using the 2key, bring the value displayed to 0.00. In this way the tem­perature compensation in conductivity measurement is excluded.

c) Take the temperature reading by pressing the °C/°F key. On the basis of

the temperature determine the conductivity of the calibration solution, for
example by looking it up in a table that indicates conductivity as a func­tion of temperature.

d) Press the  key. Press the CAL key. The µS (or mS) symbol flashes. If

the conductivity of the calibration solution is close to that used in auto­matic calibration, the instrument proposes this value. Using the

1

and

2

keys, set the conductivity value determined at point c. If the conducti­vity of the calibration solution is very different from the one used in auto­matic calibration, “E1” (slope >150% of the rated value) or “E2” (slope
<30% of the rated value) is displayed. In both cases it is sufficient to
press the 1or 2key to cancel the error signal. Using the same keys,
set the conductivity value determined at point c.

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e) Press the CAL key again to confirm the value displayed. The µS (or mS)

symbol stops flashing. Rinse the probe with water. If measurements

are later made at low conductivity, we advise rinsing it in distilled
or, better, bidistilled water.

At this point the instrument is calibrated and ready for use.

TEMPERATURE COMPENSATION

The temperature coefficient αTis the percentage measurement of the varia­tion of conductivity with temperature and is expressed in %/°C (or %/°F).
The electric conductivity of a metal decreases as the temperature increases,
while it increases in a liquid. There therefore arises the problem that the
conductivity of two liquids cannot be directly compared if the measurement
has not been made at the same standard reference temperature, which in
chemical measurements is 20°C (25°C). If the measurement is taken at a
temperature different from 20°C (25°C), an approximate assessment of the
conductivity of the liquid at 20°C (25°C) may be obtained by means of tem­perature compensation, defined by the following formula (see also fig. 3.1):

where:  = temperature expressed in °C

 = conductivity at temperature  (°C)
20 = conductivity at 20°C (25°C)

α

T

20 = temperature coefficient expressed in %/°C

Unfortunately the formula does not give good results if the temperature is
appreciably different from 20°C (25°C) because αTis not constant, but a
non-linear function of the temperature and the conductivity. Also, it is not
generally known before taking the measurement, unless it can be found on
tables referring to the liquid to be examined. αTmay be experimentally
determined by taking two measurements, one at 20°C (25°C) and another
at the temperature , having previously excluded temperature compensa­tion (in the HD 9213-R1 this may be done by setting αTat 0.00, see the
next paragraph). The formula for calculating αTis the following:

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 = 20

α

T

100

1 +

(

 - 20)

100

20

(

- 20)

α

T

x

=

 - 20

For the definition of the variables see the figure

Definition of the temperature coefficient

In the HD 9213-R1 temperature compensation is automatic and therefore it
is sufficient to set the temperature coefficient αTof the liquid with the fol­lowing procedure:

SETTING THE TEMPERATURE COEFFICIENT

α

T

To set the temperature coefficient αT,proceed as follows:
Switch on the instrument by pressing the ON/OFF key, choose the measu­ring unit °C or °F, then press the CAL and °C/°F keys simultaneously;
using the 1and 2keys, set the desired coefficient value between 0.00
and 4.00. Then press the °C/°F key to store the chosen value of αT. The
value of αTmay be set independently in either °C or °F.

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– 39 –











20

20 





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– 40 –

Concentra- Conductivity

Substance

tion 104S•cm

-1

NaOH 5 1969 2.01
(15°C) 10 3124 2.17

15 3463 2.49
20 3270 2.99
30 2022 4.50
40 1164 6.48

KOH 25 .2 5403 2.09
(15°C) 29 .4 5434 2.21

33 .6 5221 2.36
42 .0 4212 2.83

NH

3

0. 10 2 .51 2.46

(15°C) 1. 60 8 .67 2.38

4. 01 10 .95 2.50

8. 03 10 .38 2.62

16. 15 6 .32 3.01

30. 5 1 .93 –

HF 1 .5 198 7.20

4 .8 593 6.66

HCI 24 .5 2832 5.83

5 3948 1.58
10 6302 1.56
20 7615 1.54
30 6620 1.52
40 5152 –

H

2SO4

5 2085 1.21
10 3915 1.28
20 6527 1.45
40 6800 1.78
50 5405 1.93
60 3726 2.13
80 1105 3.49

100 .14 187 0.30

HNO

3

6 .2 3123 1.47

12. 4 5418 1.42
31 .0 7819 1.39
49 .6 6341 1.57
62 .0 4964 1.57

H

3PO4

10 566 1.04

(15°C) 20 1129 1.14

40 2070 1.50
45 2087 1.61
50 2073 1.74

NaCl 5 676 2.17

10 1211 2.14
15 1642 2.12
20 1957 2.16
25 2135 2.27

Concentra- Conductivity

Substance

tion 10

4

S•cm

-1

Na2SO

4

5 409 2.36
10 687 2.49
15 886 2.56

Na

2CO3

5 456 2.52
10 705 2.71
15 836 2.94

KCl 5 690 2.01

10 1359 1.88
15 2020 1.79
20 2677 1.68
21 2810 1.66

KBr 5 465 2.06
(15°C) 10 928 1.94

20 1907 1.77

KCN 3 .25 507 2.07

6 .5 1026 1.93

NH

4

Cl 5 918 1.98

10 1776 1.86
15 2586 1.71
20 3365 1.61
25 4025 1.54

(NH4)2SO

4

5 552 2.15

(15°C) 10 1010 2.03

20 1779 1.93
30 2292 1.91

NH

4NO3

5 590 2.03

(15°C) 10 1117 1.94

30 2841 1.68
50 3622 1.56

CuSO

4

2 .5 109 2.13

5 189 2.16
10 320 2.18
15 421 2.31

CH3COOH

15.84–
10 15 .26 1.69
15 16.19 1.74
20 16 .05 1.79
30 14 .01 1.86
60 4 .56 2.06

Temperature

coefficient

%/°C

Temperature

coefficient

%/°C

Conductivity and corresponding temperature coefficients of certain substances (25°C)

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HOW TO MEASURE CONDUCTIVITY

a) Connect the connector of the conductimetry cell to the instrument

paying attention to the polarization mark. Immerse the probe in the
solution so that the electrodes are covered. Shake the probe gently

so that any air inside it will escape.

b) Switch on the instrument by pressing the ON/OFF key. If the instrument

has not been calibrated, proceed to do so.

c) Set the temperature coefficient.
d) Press the  key to measure the conductivity of the liquid with reference

to the temperature of 20°C or 25°C. If you wish to measure the absolute
conductivity (that is without temperature compensation) just set αTat

0.00.

e) After use rinse the probe with clean or, better, distilled water.

MEASURING CONDUCTIVITY WITH 2-ELECTRODE
PROBES

The instrument may be fitted with 2-electrode probes with or without a
Pt100 temperature sensor and cell constant K 0.1, 1 or 10 • cm-1.
The measuring range of these cells is indicated in the diagram below:

1 10 100 10 100 1000

µS / cm mS / cm

0.1

K=10

K=1.0

K=0.1

APPLICATIONS OF CONDUCTIVITY MEASUREMENTS

It must always be remembered that the conductivity of a liquid is proportio­nal to the total amount of dissolved substances and not to one specific
substance. Despite this there are many applications of conductivity, espe­cially for quality controls.

CHECKING IMPURITIES IN WATER

The most frequent applications are in the demineralization of water, by
distillation, ionic exchange or inverse osmosis. Of course it is not possible
to measure impurities that do not contribute to conductivity, such as sand,
oil, micro-organisms, etc. Good distilled water should have a conductivity
of less than a few µS.
An interesting application is the determination of impurities in sugar. Sugar
is not an electrolyte and does not contribute to a variation of conductivity if
it is dissolved in demineralized water, but impurities do.

DETERMINING THE CONCENTRATION OF A SOLUTION

If there is only one electrolyte in a solution, its concentration may be deter­mined by measuring the conductivity. For example, the graphs above show
the conductivity trend of a number of electrolytes as a function of concen­tration. If the curve that gives the conductivity as a function of concentra­tion shows a maximum value, the concentration cannot be determined for
certain because for a given conductivity value there are two concentration
values. In this case the solution must be dissolved so at so obtain a certain
value. If the solution contains more than one type of electrolyte, the con­centration of the individual components cannot be determined unless parti­cular conditions are present. For example, an acid or a strong base contri­bute much more than a salt to the increase in conductivity. Typical exam­ples: regulation of detergent in industrial washing, regulation of degreasing
baths, regulation of galvanic baths, checking milk, checking fertilizer in irri­gation systems, etc.

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– 43 –

Conductivity of dilute solutions.

Conductivity of high concentration solutions.

CHECKING CONDUCTIVITY IN MULTI-ELECTROLYTE
SOLUTIONS

A conductimetry control often allows the chemical-physical variation of a
solution to be detected. In oceanography the total saline content may be
determined by means of conductivity measurements. In lake or river water
a variation in conductivity is often the sign of pollution due to industrial
waste water. The hardness of the feeding water for boilers, cooling towers,
steam generators, etc. may be determined approximately by means of
conductivity measurements. (In Italy it is sufficient to multiply the conducti­vity at 20°C by 0.7 to obtain the quantity of equivalent salinity expressed in
ppm of CaCO3). In the food industry the concentration of various saline
solutions for preserving foodstuffs may be determined by measuring con­ductivity.

SALINITY OF THE SOIL

It is a known fact that for different types of plants, flowers and cereals there
are optimum soil salinity values. Conductivity measuring allows indirect

determination of the salinity of the soil.

The method adopted by the Italian Society of Science of the Soil is the fol­lowing:
Take a sample of soil, dry it in the air and riddle it at 2 mm. Dissolve it in 5
times its volume of demineralized water. Stir for about 30 minutes. Let the
liquid rest for a few minutes and take the measurement with an electrode
immersed in the liquid just over the soil sediment. The conductivity found
must be expressed in µS/cm at the temperature of 20°C. The salinity of the
soil is calculated with the formula:

where: S = salinity of the soil in gr/100 of soil

20= conductivity expressed in µS at 20°C

The measured values allow the regulation of the dose of fertilizer in the irri­gation water.

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– 44 –

0.32 • 20

S

=

1000

ERROR INDICATION

OL: Overload warning.
E1: The solution used for conductivity calibration is wrong because the

slope calculation gives a value >150% of the rated value.

E2: The solution used for conductivity calibration is wrong because the

slope calculation gives a value <30% of the rated value.

E3: The temperature of the calibration solution is not between 15°C

(59°F) and 30°C (86°F). Calibration is inadmissible outside this range.

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– 45 –

(mS•cm-1)

10

2

10

5

10

3

10

6

10

4

10

7

10 10

4

0.1 1 10 100

0.1 1 10 100

Resistance (Ω•cm)

Conductivity (µS•cm-1)

Correspondence between electric resistance and conductivity

METHOD OF USE

*

Ensure that the measuring area is not live. The instrument is not insula­ted; during measurement with non-insulated probes ensure that it does
not come in contact with live surfaces with a voltage of more than 24V.
This could be dangerous for the instrument but especially for the opera­tor who could receive an electric shock.

*

Do not expose the probes to gases or liquids which could corrode the
material with which the probes are covered. Ensure that the type of
material with which the probe is made (POCAN - Alumina/Platinum) is
compatible with the environment in which the measurement is to be
taken.

*

Do not bend or deform the probes as this could cause irreparable damage.

*

Always use the most suitable probe for the measurement to be taken.

*

Be careful with the range of use of the probe, measurements at limit
values are possible only for short periods.

*

In order to obtain a reliable measurement, avoid too sudden variations in
temperature.

*

Measurements on non metal surfaces require a great deal of time on
account of their low heat conductivity.

*

Always clean the probe carefully after use.

*

The instrument is resistant to water but it is not watertight and should not
therefore be immersed in water. If it should fall into the water, take it out
immediately and check that no water has infiltrated.

*

Avoid taking measurements in the presence of high frequency sources,
microwaves or large magnetic fields, as the results would not be very
reliable.

LOW BATTERY WARNING AND BATTERY REPLACEMENT

If the battery voltage falls below a certain level, the

H

symbol appears on
the display. From that moment there remains about 1 hour autonomous
operation. The battery should be replaced as soon as possible, otherwise,
if the voltage falls even further, the data shown are no longer correct; the
battery symbol disappears. The battery used is an ordinary 9V zinc-carbon
battery, IEC6LF22.

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– 46 –

To change the battery, unscrew the cross-headed screw on the door of the
battery compartment,

open the door,

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– 47 –

take out the old battery and put in the new one.

After replacing it, close the door, inserting the tag on the door into the slot
provided, then fasten the retaining screw on the door.

Ensure that the instrument is switched off before changing the bat­tery. When disposing of the old battery, place it in the special refuse col-

lection, in this way you will help protect nature.

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– 48 –

FAULTY OPERATION WHEN SWITCHING ON AFTER
CHANGING THE BATTERY

If the instrument does not switch on or off after changing the battery,
repeat the battery changing procedure, waiting for a few minutes to allow
the circuit condenser capacities to be completely discharged, then insert
the battery.
Check that the battery you are using is really efficient; sometimes unused
batteries have not been recently manufactured so, due to the auto-dischar­ge phenomenon, their voltage level is insufficient for correct operation of
the instrument.

WARNINGS

- If the instrument is not to be used for a long time the battery must be

removed.

- If the battery is flat it must be replaced immediately.

- Take steps to avoid leakage of liquid from the battery.

- Use good quality leakproof batteries.

MAINTENANCE

Storage conditions

- Temperature: -20...+60°C.

- Humidity: less than 85% relative humidity.

- Do not store the instrument in places where:

1) There is a high degree of humidity

2) The instrument is exposed to direct sunlight

3) The instrument is exposed to a source of high temperature

4) There are strong vibrations

5) There is steam, salt and/or corrosive gas.

The instrument body is made of plastic so it must not be cleaned with
detergents which can spoil plastic.

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– 49 –

BLOCK DIAGRAM

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– 50 –

AMPLIFIER

(LINEARIZED OUTPUT)

A/D

CONVERTER

MICROPROCESSOR LCD

Pt100

SQUARE WAVE

GENERATOR

KEYBOARD E PROM

2

LOW BATTERY

DETECTOR

FOUR RANGE

AMPLIFIER

POWER SUPPLY

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– 51 –

ARRANGEMENT OF COMPONENTS

U9

U8

R

52

R 28

R 29

R 30

R 31

C 22

R 53

R 33

R1

C 17

C

19

R7

U1

Q2

Q3

R

13

C5

16C14
R

C 1 3

C 1 3

C 8

C1

11

C2

R

R7

C 25

12R

C 9

12R

U3

C 1 2

R 15

R

14

R4 7

R

49

C

24

R

44

R4 8

R3 6

R

35

R3

C 1 0

R8

R9

R 20

C 9

4 B

R4

U4

R4 2

U7

Q3 Q4

R

17

U5

2R3

R

23

O1

R

24R22

R 25

R

34

R

38

C 1 8

C 2 3

U12

U11

U6

R 26

R 50

R 45

R

27

R 19

D2

R 18

C28

R4

R6

R5

Q6

R

52

R

51

R 52

C32

C31

ENGLISH

– 52 –

ARRANGEMENT OF COMPONENTS

C11

R46

C34A

Y1

U10

C27

C26

BT1

Q1

JP2

C20

C16

C30

C29

C21

C6

C7

C3

C4

U2

JP1

R43

R41

R37

R39

R40

R38

GUARANTEE

This instrument is strictly inspected before being sold. However if there
should be any defect due to manufacture and/or transport, apply to the
dealer from whom you bought the instrument.
The guarantee period is 2 (two) years from the date of purchase. During
this period all defects found by us will be repaired free of charge, exclu-

ding those due to incorrect use and careless handling.
The probes are not covered by the guarantee, as they can be irrepara­bly damaged after only a few minutes of incorrect use.

TECHNICAL CHARACTERISTICS

- Display: LCD with 3

1

⁄2 digits, height 8 mm.

- Measuring ranges and instrument resolution:

0... 199.9 µS resolution 0.1 µS

0... 1999 µS resolution 1 µS

0... 19.99 mS resolution 0.1 mS.

Measuring range with combined 4-electrode and temperature probe:

from 5 µS to 20 mS with automatic change of scale, temperature from
0°C to 90°C.
Compatibility of the combined probe with 4 electrodes: the electrodes are
made of platinum. The isolating part is of POCAN. The temperature sen­sor is of platinum. Measuring range with 2-electrode probe and cell
constant:

0.1: from 0.1 µS to 1 mS
1: from 10 µS to 10 mS

10: from 100 µS to 20 mS
temperature 0°C to 100°C.
Temperature measuring range with probes of the TP9.. series: from

-50°C to 200°C.

- Instrument precision: ±0.5% full scale ±0.5% of reading for conductivity;
±0.2°C ±0.5% of reading plus probe error for tem­perature.

- Temperature compensation αT: automatic between t = 0.00 and t 4.00%/°C.

- Automatic calibration between: 15°C and 30°C; above and below these

values the symbol E3 appears.

- Conversion frequency: 1 second.

- Functions: Autorange, automatic/manual calibration, auto power off,

instrument calibration on EEPROM, low battery signal.

ENGLISH

– 53 –

- Instrument working temperature: 0...50°C.

- Working temperature of the combined probe SPT13, made of Pocan, with

4 electrodes: 0...90°C.

- Working temperature of the epoxy probe with 2 electrodes: 0...50°C.

- Storage temperature: -20...+60°C.

- Relative humidity: 10...85% R.H.

- Power supply: 9V battery, IEC6LF22, duration about 100 hours with

zinc/carbon battery.

- Connections: DIN 45326 round male connector on the instrument, female

connector in the probes.

- Instrument case: ABS Bayer NOVODUR, grey colour 7553CF.

- Dimensions instrument: 42x185x23 mm, weight 130 grams.

- Kit dimensions: 430x240x55 mm, weight 850 grams.

ORDER CODES

- HD 9213-R1: Kit composed of the instrument complete with zinc/carbon

battery, SPT13 combined probe with 4 electrodes, instruc­tions manual, case.

- SPT13: Combined Pocan temperature/conductivity probe with 4

electrodes for HD 9213-R1.

- HD 9213S: Combined temperature/conductivity probe with 4 electro-

des for HD 9213.

- SPT01: Combined epoxy conductivity and temperature probe with

2 electrodes, cell constant 0.1.

- SPT1: Combined epoxy conductivity and temperature probe with

2 electrodes, cell constant 1.

- SPT10: Combined epoxy conductivity and temperature probe with

2 electrodes, cell constant 10.

- TP9A: Immersion temperature probe with Pt100 sensor, precision

class A.

- TP9AP: Penetration temperature probe, Pt100 sensor, precision

class A.

- HD 8712: Conductivity calibration solution 12.880 µS/cm at 25°C;

0.1 mol/l.

- HD 8714: Conductivity calibration solution 1.413 µS/cm at 25°C;

0.01 mol/l.

ENGLISH

– 54 –

ENGLISH

– 55 –

∅

2,7

➛

➛

150

➛

➛

TP9A

-70...+400°C

COD. DIMENSIONS

SENSOR

WORKING

RANGE

∅

2,7

➛

➛

150

➛

➛

K = 0,1

SPT01

(0,1 µS...1 mS)

(0...50°C)

K = 1

SPT1

(10 µS...10 mS)

(0...50°C)

K = 10

SPT10

(100 µS...200 mS)

(0...50°C)

TP9AP

-70...+400°C

72

120

2

12

L=1.5 m

D=5

72

120

2

12

L=1.5 m

D=5

72

120

4,6

12

L=1.5 m

D=5,5

61

K = 0,7

SPT13

(5 µS...20 mS)

(0...90°C)

50

156

16

20

L=1.5 m

D=5

∅ 12

∅ 17

K = 3

HD 9213S

(5 µS...20 mS)

(0...60°C)

80

95

∅ 18

GUARANTEE CONDITIONS

All our appliances have been subjected to strict tests and are guaranteed for 24 months from date of pur­chase. The Company undertakes to repair or replace free of charge any parts which it considers to be inef­ficient within the guarantee period. Complete replacement of the instrument is excluded and no requests for
damages are recognized, whatever their origin. Repairs are carried out in our own Technical Service
Department. Transport expenses are borne by the buyer. The guarantee does not include: accidental

breakages due to transport, incorrect use or neglect, incorrect connection to voltage different from
that contemplated for the instrument, probes, sensors, electrodes and all accessories. Furthermore

the guarantee is not valid if the instrument has been repaired or tampered with by unauthorized third par­ties, or adjusted for faults or casual checking. The guarantee is valid only if all parts of the guarantee card
have been filled in. Any instruments sent for repairs must be accompanied by their guarantee certificate. For
all disputes the competent court is the Court of Padua.

CE CONFORMITY

Safety EN61000-4-2, EN61010-1 level 3
Electrostatic

discharge

EN61000-4-2 level 3

Electric fast
transients

EN61000-4-4 level 3

Voltage variations EN61000-4-11
Electromagnetic

interference IEC1000-4-3
sucseptibility

Electromagnetic
interference EN55020 class B
emission

DELTA OHM SRL
VIA G. MARCONI, 5 - 35030 CASELLE DI SELVAZZANO (PD) - ITALY
TEL. [phone] r.a. - FAX [phone]
e-mail: [e-mail] - Web Site: www.deltaohm.com

SIT CALIBRATION

CENTRE N° 124