Alphanumeric backlit LCD with 2 lines of 16
characters
Inputs and outputs
• 21 mA or the last mA value measured for the
instrument in hold
• 22 mA for the alarm with option to deactivate it
Relay
1 limit relay, with no potential. NO contact
1 limit or cleaning relay, free of potential NO
Contact
1 alarm relay, with no potential. NC Contact
Maximum load:
in CA < 24 V / < 3 A / < 72 VA
Maximum cable length
≤ 25 m
Power supply
230 or 24 VAC ±10 %, 45-65 Hz,
(115 VAC under demand)
Consumption 4 VA
Protection: Class II
Overvoltage category: II
EC Directives
Electrical security according to 2006/95/EC
Electromagnetic compatibility according to
2004/108/EC
Environmental conditions
Working temperature: 0 to 50 °C (32 to 122 °F)
Storage temperature: –20 to 65 °C (–4 to 149 °F)
Relative humidity < 80 % (non condensing)
Max. height 2.000 m. at 230 V; 3.000 at 24 V
As a result of constant improvements to our products sometimes differences may exist between this manual
and the instructions supplied with the instrument.
ENGLISH
2.1. Safety information
Please, read carefully this information before installing and using the instrument !
Pay attention to all danger and caution statements.
2.1.1. Use of hazard information
DANGER
Indicates a potentially or imminently hazardous situation that, if not avoided, will result in death
or serious injury.
WARNING
Indicates a potentially or imminently hazardous situation that, if not avoided, may result in death
or serious injury.
CAUTION
Indicates a potentially hazardous situation that, if not avoided, may result in minor or moderate injury.
Important note
Indicates a situation that, if not avoided, could lead to damage to the instrument. Important information that requires special emphasis.
Note
Information that supplements points in the main text.
Precautionary labels
Read carefully all labels and tags attached to the instrument.
This symbol references the instruction manual for operation or safety information.
This symbol indicates that a risk of electrical shock or electrocution exists.
This symbol indicates the connection for Protective Earth.
This symbol indicates ground connection.
This symbol identifies a fuse.
Electrical equipment marked with this symbol may not be disposed of in European public disposal systems after 12 August of 2005. In conformity with European local and national regulations (EU Directive
2002/96/EC), European electrical equipment users must now return old or end-of life equipment to the
Producer for disposal at no charge to the user.
Note: For return for recycling, please contact the equipment producer or supplier for instructions on how
to return end-of-life equipment, producer-supplied electrical accessories, and all auxiliary items for proper
disposal.
• Remember that the voltage across accessible
parts of the open instrument, may be dangerous
to life. Do not open the instrument when it is
connected to the power supply, there are areas
whose voltage could cause death.
• Always disconnect power to the instrument
before it is opened.
• Repair or adjustment of an opened instrument
under voltage shall be carried out only by
a qualified technician who is aware of the
hazards involved.
• Never work in an environment subject to
explosion hazards. The housing of the
instrument is not gas tight.
• The Company will not be responsible for any
physical damage caused by non authorised
work or manipulation.
• It is the responsibility of whoever uses this
instrument to consult and establish appropriate
safety and health practices and determine the
applicability of regulatory limitations prior to use.
• Before connecting the instrument to a power
supply unit, make sure that the mains voltage
lies within the range:
230 or 24 V AC ±10%, 45-65 Hz (standard
version).
115 V AC ±10%, 45-65 Hz (under demand).
Important notes
• Read carefully the manual of the instrument.
• Avoid direct sunlight over the instrument.
• Exclude the following environmental influences:
- vibrations
- atmospheric humidity higher than 80 %
- corrosive gases present
- temperature < 0 °C, or > 50 °C (< 32 °F, or >
122 °F).
- powerful electric and magnetic fields.
• Only use original accessories and spare parts.
• Have the instrument serviced only by the
Company Service.
2.2. General product information
Proper use
The si629 C is used for conductivity, salinity and temperature measurement in food industry, waste water,
in the environment, etc.
Only qualified personnel should conduct the tasks described in this section of the manual.
3.1.1. Assembly
Wall mounting
Open the case by unscrewing the 4 A screws.
25 mm
1 in
50 mm
2 in
A
50 mm
2 in
ENGLISH
115 mm
4.5 in
25 mm
1 in
Front viewSide viewRear view
For wall mounting of the instruments, use the B drill holes indicated on the scheme.
Pipe or column mounting
Use the pipe adaptor, PN LZU9120.99.
Install the pipe adaptor on the rear part of the instrument using both C drill
holes as indicated on the figure. Fit the unit with two clamps to the column.
To open the transparent front door, press with two
fingers the part marked with (
) in the scheme.
Cable glands.
On the lower part of the instrument there are 5
cable glands, 2 PG 7 and 3 PG 9.
PG 7 (2 units)
PG 9 (3 units)
3.1.2. Connections
When making any wiring connections to the instrument, any warnings and notes found throughout the
manual must be adhered to. For more safety information see “Safety information” on page 5.
DANGER
Always disconnect power to the instrument when making any electrical connections.
System functions
1,2 Voltage 230 or 24 VCA ± 10%.
(115 VCA upon request).
3 Ground connections, see
notes (
page 9).
4,5 Current output 4-20 mA (EC).
6,7 Input for temperature probe.
8 Cell cable shielding
9 to 12 Entrada para célula de 2 polos.
13,14 Limit 1 relay contacts.
15,16 Alarm relay contacts.
17 to 19 Limit 2 or Cleaning relay contacts.
DANGER
High-voltage wiring for the instrument is protected by a protective casing. The protective casing
Important
must remain in place unless a qualified installation technician is installing wiring for power.
When making any wiring connections to the instrument, any warnings and notes found throughout the
manual must be adhered to. For more safety information see “Safety information” on page 5.
DANGER
Always disconnect power to the instrument when making any electrical connections.
3.2.2. Connections
System functions
1 Ground connection, see Important
notes (page 12).
2,3 Power supply 230 or 24 VCA ± 10%.
(115 VCA upon request).
4,5 Alarm relay contacts.
6,7 Limit 1 relay contacts.
8,9 Limit 2 or Cleaning relay contacts.
10,11 Current output 4-20 mA (EC).
12 to 15 Input for 2 pole cell.
16 Cell cable shielding.
17,18 Input for temperature probe.
DANGER
High-voltage wiring for the instrument is protected by a protective casing. The protective casing
must remain in place unless a qualified installation technician is installing wiring for power.
it is recommended to connect the instrument to
ground using terminal 1.
It is also recommended to use shield cables
for the cell signal (triaxial cable), and the
temperature probe.
The external shield of the triaxial cable and
the temperature cable must be connected to
RED
VCA
A
L 2 / C
L
terminal 16.
DANGER
Relays:
- Limit the current up to 3 A by using
one fuse.
- Do not connect cables with voltage
higher than 24 V.
3.3. Cell cables
Compensation of the cable length
To minimize the effect of the cable resistance in a conductivity measurement, the cable length is compensated by the 4-wire system. With the Pt 1000 temperature sensor, the cable resistance has little importance.
However, in order to reduce the resistance of the conductor to a half, 2 cables have been connected to
the ends of the sensor.
Fit a jumper between terminals 9 and 10 (12 and 13 in panel mount instrument) and another between
the terminals 11 and 12 (14 and 15 in panel mount instrument).
3.4. Protective wiring of switching contacts
Relay contacts are subjected to electrical erosion.
Especially with inductive and capacitive loads, the service life of the contacts will be reduced.
For suppression of sparks and arcing, components such as RC combinations, nonlinear resistors, series
resistors and diodes should be used.
Typical protective wirings
AC applications with inductive load
DC applications with
inductive load
AC/DC with
capacitive load
RC
Load
RC
Contact
relay
Typical RC at 230 VAC: Capacitor 0.1 µF/630 V
Resistor 100 Ω/1 W
This page shows the instrument’s operation by blocks. It is intended to provide a quick idea about all the
instrument’s capabilities and how to gain access to them.
MEASURING 22.3°C
µS/cm
545
@25°
Security acces
code.
It limits the access
to calibration
or programming
of the instrument
CODE 000
Vary the underlined digit with
and accept with.
Authorised code = 100
by non authorised
personnel.
When the “Code” screen has been shown
for more than 30 sec. the instrument will
automatically return to MEASURE.
Instrument in “Hold” state
When being in the gray zone, the instrument is in hold state:
• Limit and cleaning relays are open.
(Alarm OFF).
• According to the configuration the current output is frozen at 21 mA or at the
mA corresponding to the last measured
value.
(*) When being in Test 4-20 the current is
the one programmed manually to be able
to carry out the test.
To quit the hold state it is necessary to return to Measure. The Current output 4-20
and the Relays will activate in 10 sec.
This process involves adjusting the read values by a
conductivity measuring system (instrument and cell) according to the values of standard solutions.
Calibration is very important for highly accurate readings.
The equipment is capable of one-, two- and three-point
calibration, and automatically recognises 147µS/cm,
1413 µS/cm and 12.88 mS/cm standards.
The calibration parameters are stored in the memory
until a new calibration is performed.
MEASURING 22.3°C
545
µS/cm
@25°
CODE 000
Introduce the
code 100.
One-point calibration
This form of calibration is acceptable when measuring
conductivity values around that of the used standard.
This is the most common type of calibration. In this type,
1413 µS/cm is the most commonly-used standard.
23.2°C
Standard 147 µS/cm
Two-point calibration
This type of calibration is recommended for work in high
or low conductivity regions where accuracy is required.
The 147µS/cm and 1413 µS/cm standards should be
used for low conductivity regions, and 1413 µS/cm and
12.88 mS/cm for high conductivity measurements.
Three-point calibration
Standard 1413 µS/cm
This type of calibration is recommended when the conductivity of the samples to be measured ranges from
low to high.
Notes:
When a calibration in 2 or 3 points is performed, start
with the standard with lowest conductivity. In this way, a
contamination is avoided.
During Calibration the instrument is in Hold state:
• Limit and cleaning relays contact are open.(Alarm OFF).
• Current output is frozen at the programmed value in
Hold.
To quit the Hold state it is necessary to return to MEASURE.
The Current output 4-20 and the Relays will activate in
10 sec.
For practical reasons, in calibration is recommended
to select the temperature manually even if you have
connected a CAT probe (Pt 1000/Pt 100).
23.2°C
Standard 12.88 mS/cm
P1=147,0 µS/cm
C
P2=1413,0 µS/cm
C
CALIBRATE
CAL. 23.2°C
142.6 µS/cm
23.2°C
CAL. 23.2°C
1364 µS/cm
=0,393 cm
1
=0,397 cm
2
-1
-1
to MEASURE
If you have a
cell without CAT,
manually enter the
temperature value.
Once the reading
is stable, the
display changes
automatically.
The instrument is supplied with the default configuration specified in Start-up, page 15.
To modify the default configuration and adapt it to specific applications follow the diagram below.
Limit.
Select the relay values.
Input “ON” (closed contact).
Output “OFF” (open contact).
Conductivity: between 0.0 µS &
200 mS.
Salinity: between 0.0 mg/l &
278 g/l
* LIMIT 2 / CLEANING
The option LIMIT 2 will only appear
if relay 2 is configured as a limit
relay.
Alarm
Selection of the time lag before
activating the alarm. Select between
1 and 99 seconds, minutes or hours.
0=deactivated.
Cleaning
T on: cleaning time. Min. value: 3
sec. (relay activated or cleaning).
To deactivate the cleaning function,
T on=0 must be programmed.
Toff: Cleaning deactivation time.
Min. value: 3 s (relay deactivated ).
Example: Ton: 3 sec., Toff: 1 h; it
will clean during 3 sec. each hour.
Post-cleaning time: 0 to 99 sec.
Output current.
Select de conductivity values
corresponding to the current output
(4 mA and 20 mA).
Conductivity: between 0.0 µS
& 200 mS.
Salinity: between 0.0 mg/l &
278 g/l t
Hold. Selection of the current output
when the instrument is in Hold
state: fixed at 21 mA or at the mA
corresponding to the last measured
value.
MEASURING 22.3°C
545
4 to 20 mA OUTPUT(*)
µS/cm
@25°
CODE 000
LLIMIT (*)
ALARM
CLEANING
HOLD
Continue at
the next page.
Enter code 100
Press until the desired option is reached.
ON - - - - - - OFF
1000 µS 800 µS
Vary the underligned digit with
and accept with
ALARM
01 min
CLEANING
Ton= 03 s Toff=01 h
4 mA 20 mA
STORING DATA
200 µS 2.0 mS
> 21 mA
last value
Vary with
(*) LIMIT and 4 - 20 mA OUTPUT: Allow the introduction of 5 digits. Place the decimal on the desired point.
Conductivity, salinity and temperature measurement
The value of the specific conductivity or salinity, the sample temperature in °C and the reference temperature appear simultaneously on the display.
If the Pt 1000 temperature probe is not connected it is necessary to inform the instrument about the
temperature of the solution using the arrow keys
Conductivity cells incorporate a Pt 1000 temperature sensor.
The si629 C allows readjusting the conductivity measured
value by modifying the reading that appears on the display. Previously the conductivity of the sample must have
been measured with a perfectly calibrated instrument.
During the readjustment the si629 C behaves as it was
calibrated with one buffer only.
Every time the si629 C is calibrated in the conventional
manner, the readjustment is lost.
MEASURING 18.3°C
12.15
INDIRECT CAL.
12.15 mS
INDIRECT CAL.
12.15 mS
P: 12.28mS
C: 0.700 cm
MEASURING 18.3°C
12.28
mS/cm
mS/cm
@25°
Press for more than 3 sec.
or
+
or
+
-1
@25
ENGLISH
Important: It is not possible to perform salinity readjustment.
To verify the correct functioning of the relays and 4 to 20 output, enter the options:
Manual Relay
Pressing
When releasing the
Test 4 to 20 mA
Select in the display, the µS/cm or mg/l value desired to simulate. The current output must be the
indicated in the display, according to the selected values in Programming Output 4 to 20, see page
20-21.
MEASURING 22.3°C
545
the selected relay is activated (except the alarm relay, which is deactivated).
(ON). When not pressing ENT anymore, it
deactivates (OFF).
Nota: During Manual control of relays
and Test 4 to 20 the instrument is in
Hold state:
• Limit and cleaning contact relays are
open. (Alarm OFF).
• Current output is frozen at the value
programmed in Hold, except the
option “Test 4-20” that maintains
the manually programmed current
output for carrying out the tests.
To quit the hold state it is necessary to
return to MEASURE.
OFF
25.0°C
4. Operation
4.11. Data Logger
The si629 C is able to store up to 200 data in memory. When the data logger is full, data will be stored
replacing the eldest ones. Data can be stored following two different criteria:
Interval: data are stored with the frequency programmed in Interval:
XX min.
MEASURING 22.3°C
µS/cm
545
@25°
Event: data are stored only if the values are higher o lower than the
programmed value, and with the selected frequency.
ENGLISH
CODE 000
DATA LOGGER
D. LOG. > View
Program
Erase
MEASURE
MEASURING 22.3°C
µS/cm
545
@25°
Enter code 100 and y accept with
Press until the desired option is reached.
Max 12-04 / 12:22
1250 µS/cm 25.2°C
VIEW > Max.
Min.
All
Press to select the
desired option.
It displays only the maximum stored reading.
Min 12-04 / 11:21
520 µS/cm 25.2°C
It displays only the minimum stored reading.
001 12-04 / 11:01
545 µS/cm
It displays all stored data. The first record will be
displayed, and then it will automatically go on
one by one every 1 sec.
Press
Press to stop the automatic view. The display
will be frozen at the last displayed record.
Press
Press
PROG. > Interval *
Event
Select the value and the unit (sec., min. or hours)
Start
Stop *
Date
Hoor
Press to select the desired option.
Select START to start the storage
of data.
Select STOP to end this option.
ERASE
25.2°C
to quit the View display.
to see data in increasing order.
to see data in decreasing order.