JENCO 6308CST User manual

Operation Manual
MODEL 6308CST
Conductivity/Salinity/Temperature
Transmitter/Controller
6308CST

1
CONTENTS
GENERAL INTRODUCTION......................................................................................... 2
ASSEMBLY...................................................................................................................2
A. Mounting Procedure............................................................................................2
B. Cleaning The Meter..............................................................................................3
DISPLAY & KEY FUNCTIONS..................................................................................... 3
A. Display................................................................................................................3
B. Operational Keys Description............................................................................... 4
REAR CONNECTORS..................................................................................................5
TURNING ON/OFF THE METER.................................................................................. 6
MODEL 6308CST MODES............................................................................................6
A. Measure Mode.....................................................................................................6
B. Calibration/Setting Mode...................................................................................... 8
1. Password check page.................................................................................... 9
2. User setting page........................................................................................... 9
3. Conductivity calibration page.......................................................................1 0
4. Conductivity (or salinity) control settings page.......................................... 12
5. Current out page..........................................................................................13
6. Temp./RS485/password settings page.......................................................... 13
CONTROLLING THE RELAYS...................................................................................14
A. Isolation Voltage................................................................................................14
B. Output Load.......................................................................................................14
C. Relay Action, Relay Setpoint& Hysteresis Value................................................. 14
D. Conductivity/Salinity Relays...............................................................................15
E. Temperature Relays...........................................................................................15
4 - 20 mA OUTPUT.....................................................................................................15
A. Isolation Voltage................................................................................................15
B. Output Load.......................................................................................................16
C. Conductivity/Salinity Linear Output.................................................................... 16
RS485 INTERFACE OPERATION..............................................................................16
A. Introduction.......................................................................................................16
B. Preparing The Meter...........................................................................................17
PROBE HANDLING AND MAINTENANCE................................................................ 17
A. Handling The Probe...........................................................................................17
B. Storing The Probe..............................................................................................17
ERROR DISPLAYS AND TROUBLESHOOTING.......................................................18
SPECIFICATIONS...................................................................................................... 18
WARRANTY............................................................................................................... 20

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GENERAL INTRODUCTION
The Jenco model 6308CST (Conductivity, Salinity and Temperature) system is a rugged
microprocessor based meter assembled in a watertight ¼ DIN case, designed for use in
laboratories and process control applications.
The model 6308CST microprocessor allows the user to easily recalibrate the parameters for the
probes. The conductivity system requires only a single calibration. The microprocessor also
performs a self-diagnostic routine every time you turn on the unit providing you with basic
information about the stability of the meter.
The system simultaneously displays conductivity, salinity, temperature, cell constant, relay
status and mA output in one graphic LCD screen. The LCD also includes a backlight for low-lit
environments. This system uses a four-wire type probe for the conductivity and a precise
thermistor for temperature, providing you with accurate readings for all your measurements.
The model 6308CST is equipped with three relays: two programmable high/low control relays for
conductivity/Salinity and one programmable high/low control relay for temperature. All relays are
hysteresis driven and configurable to EDGE mode. The system also has an isolated 4-20 mA
analog output, offset and span configurable for conductivity/salinity display.
The model 6308CST is using the standard RS485 MODBUS RTU protocol, which can easily let
the user log all data (from multiple model 6308 or 6309) with an PC.
ASSEMBLY
Carefully unpack the meter and accessories. Inspect for damages made in shipment. If any
damage is found, notify your Jenco representative immediately. All packing materials should be
saved until satisfactory operation is confirmed.
A. MOUNTING PROCEDURE
1. Make a cutout on any panel,
with a thickness of 1/16 in.
(1.5 mm) to 3/8 in. (9.5mm).
2. Remove the mounting
assembly from the controller
and insert the controller into
the cutout.
3. Replace the mounting bracket
assembly onto the controller
and secure the controller to
the mounting panel.
3.66"
0.04
0.00
93.00mm
1.00
0.00
93.00mm
3.66"
0.00
0.00
1.00
0.04
0.04"R(1.0mm) MAX.
PANEL CUTOUT DIMENSIONS

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Warning: If the equipment is used in a manner not specified by the manufacturer, the
protection provided by the equipment may be impaired.
B. Cleaning The Meter
1. Be sure to remove the power before attempting to clean the meter.
2. Use a lint free cloth and clean water or neutral detergent.
3. Wipe the outer surface of the meter only.
4. Wipe-dry the meter before powering again.
DISPLAY & KEY FUNCTIONS
A. Display
Figure 1
1. CELL CONSTANT-
Actual cell constant of the probe computed
from the last cell constant calibration.
2. CURRENT OUT-
This will display the actual output of the
isolated 4-20 mA output.
3.
-
This will be displayed if Calibration/Setting
pages are password locked meaning the
user can’t change the values unless the
correct 4 digit number has been entered.
4. H1 or L1-
This is the status of conductivity/salinity
RELAY 1, if this is displayed then the relay
is ON. (H stands for high action control and
L stands for low action control).
5. H2 or L2-
This is the status of conductivity/salinity
RELAY 2, if this is displayed then the relay
is ON.
6. H3 or L3-
This is the status of the temperature
RELAY 3, if this is displayed then the relay
is ON.
7. Conductivity or Salinity display.
8. Temperature display.

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B. Operational Keys Description
Figure 2
NO.
Key
Description
1
MODE-
In the measure mode, pressing this key will change the display to conductivity
or salinity.
In the Calibration/Setting mode, pressing this key will move to the next digit of
the current active parameter.
In the Calibration/Setting mode, pressing this key for two seconds will move the
user back to the previous parameter.
2
CAL/VIEW-
Pressing this key for about two seconds, during normal display mode will switch
to Calibration/Setting mode.
During Calibration/Setting mode, pressing this key will switch to the next
available Calibration/Setting page. Pressing this key at the last User/Calibration
page will return the user to the normal display mode.
3
UP-
During Calibration/Setting mode, pressing this key will increment the current
blinking digit of the active parameter.
4
DOWN-
During Calibration/Setting mode, pressing this key will decrement the current
blinking digit of the active parameter.
5
ENTER-
During Calibration/Setting mode, pressing this key will save the current
modified parameter and move to the next parameter.

5
6
LIGHT-
Pressing this key will turn on or turn off the backlight of the LCD.
The backlight will automatically turn off if there is no key activity within two
minutes.
REAR CONNECTORS
Figure 3
For wiring the probes, relays, analog output, RS485 and power cord, please see proper wiring
instructions indicated below. Be sure the AC plug is not plugged-in. Remember that the unit is
ON once the user plugs in the power cord to an AC power supply.
1. Connect the AC line to the rear of the meter. The model 6308CST can be used with 115 or
230 VAC 50/60 Hz. Power consumption is 6 watts. Make sure the EARTH connector is
connected to the earth lead of the AC power line.
2. Connect the proper load to the output relays. Make sure that the load does not exceed
the relay rating, 5 Amp at 115 VAC and 2.5 Amp at 230 VAC.
3. Set the proper load to the 4-20 mA-output connector. Make sure that the load impedance
is less than 500 Ohms.
[Note: MAKE SURE YOU CONNECT THE AC POWER CORD TO THE CORRECT AC
TERMINALS. CONNECTING INCORRECTLY MAY DAMAGE THE UNIT
PERMANENTLY.]

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TURNING ON/OFF THE METER
By just plugging the unit to a correct AC voltage, the unit will be ready for use. There is no
Power key so unplugging and plugging the unit will turn OFF or turn ON the unit respectively.
After the unit is turned on, it will perform some basic self-diagnostics and will display “OK” or
“BAD”. If you received any “BAD” messages turn OFF the unit and turn it ON again. (See
ERROR DISPLAYS AND TROUBLESHOOTING).
If the message persists then you might need to call your Jenco distributor. (See WARRANTY)
After the self-diagnostic is completed, the temperature reading will be shown on the lowest part
of the screen and the user is ready to make conductivity or salinity measurements.
MODEL 6308CST MODES
A. Measure Mode
Turning ON the unit will always display in the conductivity measure mode.
This meter is designed to provide 3 distinct measurements:
1. Temperature
Current temperature of the solution, which is always displayed.

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2. Compensated Conductivity
A conductivity reading adjusted to a calculated value which would have been read if the
sample had been at the user reference temperature.
The conductivity of solutions of ionic species is highly dependent on temperature, varying
as much as 3% for each change of 1°C (Temperature Coefficient (TC) = 3%/°C). In
addition, the temperature coefficient itself varies with the nature of the ionic species
present.
Because the exact composition of a natural media is usually not known, it is best to report
a conductivity at a particular temperature, e.g. 10.2 mS/cm at 15 °C. However in many
cases, it is also useful to compensate for the temperature dependence in order to
determine the measurement at a glance if gross changes are occurring in the ionic content
of the medium over time. For this reason, the model 6308CST allows the user to output
conductivity in either raw or compensated form. If the user Temperature Coefficient (TC) is
set to 0.00% then an uncompensated conductivity is output to the screen. If the TC is
not zero then the model 6308CST uses the temperature, TC, raw conductivity and the
reference temperature to display the compensated conductivity.
The calculation is carried out as in the equation below:
Compensated conductivity = conductivity/(1+TC*(T- RT))
Where: TC = Temperature Coefficient
T = Solution temperature
RT =Reference Temperature
3. Salinity
Salinity is the ratio of the mass of dissolved matter to the mass of solution. This is
expressed in ppt (parts per thousand).
Temperature and conductivity (or salinity) are always simultaneously displayed in the
graphic LCD screen in measure mode. The user can select conductivity or salinity reading
by pressing the “MODE” key in measure mode.

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B. Calibration/Setting Mode
Pressing the “CAL/VIEW” key for about two seconds during the measure mode will bring-
up the first page of six pages of the Calibration/Setting mode. Pressing “CAL/VIEW” key
will switch to the next page. At the last page, press “CAL/VIEW” key again will return the
user to measure mode.
Below is a simple flowchart showing the path of the “CAL/VIEW” key:
The user can change any blinking words or digit by pressing the “UP” or “DOWN” keys.
For options in digit format, the user needs to press the “MODE” key to move to the next
digit. If the user is satisfied with the selection made, press the “ENTER” key to save the
changes and move to the next option. If the user does not need to change the current
blinking option just press the “ENTER” key to move to the next selection.

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1. Password check page
a. Screen illustration
The user will only see this page if the unit is password locked.
To change any settings or calibration, the user needs to unlock the system to remove the
“PASSWORD LOCKED” message by entering the correct 4-digit password.
The user can still view all the pages of Calibration/Setting mode if the system is
password locked by just pressing the “CAL/VIEW” key on this page. If the unit is
“PASSWORD LOCKED”, going to Calibration/Setting mode will not affect the function
of the relays.
[Note: If the unit is not locked then every time the user enters the Calibration/Setting
mode the relays and analog out will be frozen.]
2. User setting page
a. Screen illustration
The user will only see this page if the unit is not password locked. This page is just a
warning, telling the user that all relays are frozen and that the user can calibrate and
change the settings.

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[NOTE: FROZEN means all the relays and the analog out will maintain their last status
until the user returns to normal display mode.]
3. Conductivity calibration page
a. Screen illustration
1) BASE CELL K : 0.475- This is the basic probe cell constant.
2) RANGE- The user can choose 3 different ranges for conductivity, and an additional 3
ranges if he/she wants the relay controls to be in salinity. Whichever the user chooses,
he/she can still view the reading in salinity or conductivity but the relay control &
current out will always be what the user chooses here. Choosing mS/cm or uS/cm
range will let the conductivity readings affect the relays set point and the current out.
Choosing ppt will let the salinity readings affect the relays and the current out.
Conductivity and salinity have the same range limit except for the units displayed.
3) REF. TEMP.- If the Temperature Coefficient (TC) is not zero then the model 6308CST
will use the value here to calculate and display the compensated conductivity or
salinity. The displayed value will be the value as if the temperature is the Reference
Temperature. The normal reference temperature is between 15 to 25 °C but the user
can actually select between 10 to 29 °C in this option.
4) TEMP. COEFF.- This will be used in the conductivity mode if the user wants the
displayed value to be compensated. Setting this option to 0.00% will disable
compensation. The user can select between 0.00% to 4.99%.
5) C@ 25 °C- If the user is calibrating the Cell Constant, the user must enter the
conductivity value of the standard solution at 25 °C.
b. Before calibration remember to do the following:
1) Use properly stored standard solutions and a clean calibration container.
2) Rinse the probe with de-ionized or distilled water (wipe dry) before immersing into
standard solutions.
3) After immersing into the solution, let the reading stabilize for about 1 minute and shake

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the probe lightly to remove any air bubbles.
4) To minimize errors, perform the calibration as close as possible to the selected
reference temperature.
c. Conductivity calibration
1) Clean the probe thoroughly.
2) Wait for about 30 minutes after the user turned on the meter to stabilize the circuitry
before calibrating the probe.
3) Choose a calibration solution closest in ion concentration to the sample being
measured.
4) Select the correct Range for the standard solution.
5) Input the temperature coefficient of the standard solution. Most standard salt
calibration solution has a TC between 1.91% to 2.00%. If the TC is not available use
the default of 1.91%.
6) During calibration the user reference temperature is disregarded. The reference
temperature is fixed at 25 °C since this temperature is the most popular reference
temperature for all if not most standard solutions.
7) Immerse the probe into the solution. Shake the probe lightly to remove air bubbles
from the probe. Do not let the probe touch any part of the container and allow at least
1 minute so the conductivity and temperature reading will stabilize.
8) Press the "ENTER" key to capture the stable reading and freeze the reading. The
model 6308CST will blink the first digit to tell the user can now input the standard
solution value.
9) Input the standard solution value by using the "UP" and "DOWN" keys (to
increment/decrement the blinking digit), the "MODE" key (to select another digit).
Press the “ENTER” key to calculate and save the new cell constant.
10) The model 6308CST is now ready for conductivity/salinity measurements.
d. Conductivity, salinity measurements
1) Clean the probe thoroughly.
2) Move to Conductivity calibration page.
3) Set the range to the approximate range of the solution.
4) If the user wants a compensated reading, input the closest Temperature Coefficient of
the sample or use the default of 1.91%. Set the Temperature Coefficient to 0.00% if the
user wants just the raw uncompensated conductivity.
5) If the Temperature Coefficient is not 0.00%, the user needs to select a reference

12
temperature or sets it to the default of 25 °C.
6) Move the display to the measure mode.
7) Immerse the probe into the solution. Shake the probe lightly to remove air bubbles
from the probe. Do not let the probe touch any part of the container and allow at least
1 minute so the temperature reading will stabilize.
8) Read the display. Press the "MODE" key to toggle between conductivity and salinity
reading.
4. Conductivity (or salinity) control settings page
a. Screen illustration
1) HI RELAY 1- The control type for this relay is changeable. The user can choose “HI”-
type or “LO”-type. In HI-type, RELAY 1 will turn ON if the conductivity or salinity is
greater than the RELAY 1 setting. In LO-type, RELAY 1 will turn ON if the
conductivity or salinity is less than the RELAY 1 setting which is modified by the
hysteresis value.
Use “UP” and “DOWN” to change the RELAY 1 type then press “ENTER” key to
save. After selecting the RELAY 1 type, the user can now select the RELAY 1
setting.
Use “UP” and “DOWN” keys to change the blinking digit. Use the “MODE” key to
select another digit and the “ENTER” key to save the new setting.
2) LO RELAY 2- The control type for this relay is changeable. The user can choose
“HI”-type or “LO”-type control. In HI-type, RELAY 2 will turn ON if the conductivity or
salinity is greater than the RELAY 2 Setting. In LO-type, RELAY 2 will turn ON if the
conductivity or salinity is less than the RELAY 2 setting which is modified by the
hysteresis value.
Use “UP” and “DOWN” to change the RELAY 2 type then press “ENTER” key to
save. After selecting the RELAY 2 type, the user can now select the RELAY 2
setting.

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Use “UP” and “DOWN” keys to change the blinking digit. Use the “MODE” key to
select another digit and the “ENTER” key to save the new setting.
3）HYS.- This is the actual value of the hysteresis.
5. Current out settings page
a. Screen illustration
1) 4 mA OUT- This value will be used in conjunction with 20 mA to plot the current
output. (See section 4 - 20 mA OUTPUT.)
2) 20 mA OUT- This value will be used in conjunction with the 4 mA value to plot the
output. (See section 4 - 20 mA OUTPUT.)
6. Temp./RS485/password settings page
a. Screen illustration
1) RELAY 3- The temperature has only one relay to control. The user needs to set what
control type it will use, HIGH or LOW type. In HIGH-type, RELAY 3 will turn ON if the
temperature is greater than the RELAY 3 setting. In LOW-type, the RELAY 3 will turn
ON if the temperature is less than the RELAY 3 setting which is modified by the
hysteresis value.

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2) SET POINT- This is the RELAY 3 control set point.
3) HYSTERESIS- This is the actual value of the hysteresis. The user can change this
value from 0.1 to 19.9 °C.
4) PARITY- This option would let the user choose if the current RS-485 type is “EVEN”,
“NONE” or “ODD”.
5) RS485-RTU ID- This is the unique ID/Address for the unit. If the user is connecting
multiple model 6308CST or other Jenco models for logging purposes then this
ID/Address must be unique for each connected unit. This ID/Address is the same
address that must be used by the PC program to communicate with this unit.
6) PASSWORD- The meter allows the user to set a four digit password. At the
Temp./RS485/password settings page, press "MODE" key. The number starts to
blink. Use "UP" or "DOWN" key to select the desired digit. Press "ENTER" key to
save password.
[Important note: The password must be entered at password check page to change
settings.
The user is responsible for remembering the password number, otherwise the user
would not be able to calibrate or change all the settings.]
CONTROLLING THE RELAYS
A. Isolation Voltage
The maximum isolation voltage of the relay output contacts is 1500 VDC. The voltage
differential between the relay output contacts and the load should not exceed 1500 VDC.
B. Output Load
The current through the relay output contacts should not exceed 5 Amp at 115 VAC and 2.5
Amp at 230 VAC in order not to cause permanent damage to the relay contacts. This rating
is specified for resistive loads only.
C. Relay Action, Relay Setpoint & Hysteresis Value
If the relay control type is set to HI, the relay will turn ON at (RELAY SETPOINT), and will
turn OFF at [(RELAY SETPOINT - (hysteresis value)].
If the relay type is set to LO, the relay will turn OFF at [(RELAY SETPOINT) + (hysteresis
value)], and will turn ON at (RELAY SETPOINT).
Relay Action
Effective RELAY-ON Set point
Effective RELAY-OFF Set point
HIGH
S.P.
S.P. - H.V.
LOW
S.P.
S.P.+ H.V.
H.V. = Hysteresis value (Dead Band)
S.P. = Relay Set point

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Figure 4
[Note : Setting any hysteresis value to zero may cause jitter and possibly damage the
relay(s).]
D. Conductivity/Salinity Relays
There are two independent relay channels for conductivity or salinity display which have
independent set point and HIGH or LOW control type (see Figure 4.). The hysteresis value
will be used by both conductivity/salinity relays.
The action of the conductivity/salinity relays is dependent on set point, relay control type
(HIGH or LOW), hysteresis value and the current conductivity or salinity display (See figure
4.)
E. Temperature Relay
One relay channel is available for temperature display which has independent set point and
HIGH or LOW action (see figure 4) setting and hysteresis value.
The action of the temperature relay is dependent on set point, relay action type (HIGH or
LOW), hysteresis value and the current temperature display.
[Note: The user can set the SET POINT from 0.0 to 199.9 °C, but be reminded that the
range of the temperature is –10.0 to 120 °C.]
4 - 20 mA OUTPUT
A. Isolation Voltage
The maximum isolation voltage of the 4-20 mA output is 500 VDC. The voltage differential
between the 4-20 mA output and the load should not exceed 500 VDC.

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B. Output Load
The maximum load is 500 Ω. Output current inaccuracies may occur for load impedance in
excess 500 Ω.
C. Conductivity/Salinity Linear Output
The analog output will produce a linear analog output if the user selects this option (see
figure 5). The analog output will be dependent on the conductivity/salinity_4 mA setting,
conductivity/salinity_20 mA setting and the current conductivity/salinity display.
Figure 5 Conductivity/salinity linear output
The conductivity/salinity linear analog output is based on the following equation:
Where :
mA (c) = analog output
D(c) = current conductivity or salinity display
C(4) = conductivity or salinity user setting for 4 mA
C(20) = conductivity or salinity user setting for 20 mA.
[Note: The absolute difference of the 4mA and 20mA settings must be greater or equal to
10 LSD (Least Significant Digit) of the user range.
If the absolute difference is smaller than 10 LSD the current output will display “ERROR”.]
RS485 INTERFACE OPERATION
A. Introduction
This meter is using the standard RS485 MODBUS RTU protocol. Please read the
“protocol.doc” in the accompanying disk to help programming an application that will
communicate with the meter. There is also a simple demo program in the disk that the
user can install to see the protocol in action.

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B. Preparing The Meter
The meter's RS485 MODBUS RTU interface requires 2 ordinary (preferably awg 24)
unshielded twisted pair wires connected in a daisy-chain configuration.
PROBE HANDLING AND MAINTENANCE
A. Handling The Probe
To ensure accurate and repeatable results:
1. The probe must be clean before making any measurements. If measuring low conductivity
solutions, extra ordinary cleanliness may be necessary.
2. The cell plates of the probe must totally submerged in the solution. The probe chamber must
be free of trapped air or particulates. The user may need to tap the probe gently to dislodge
any air bubbles.
3. Ideally, when immersed into a sample, the probe should be at least 1/4 inch or 1 cm away
from any object, including the sides and bottom of the container.
4. Stirring may be necessary for high accuracy readings.
5. If possible, isolate the solution container from ground potentials.
6. Electrical fields and stray currents caused by stirrer motors, heaters, etc., can interfere with
the measurements. The user should determine the effects of these and make the necessary
corrections either by shielding or by disconnecting those units that cause trouble.
7. Always rinse the probe carefully before using it in another solution.
8. Never store a dirty or contaminated probe.
B. Storing The Probe
1. Always rinse the probe thoroughly with de-ionized or clean tap water to remove
contaminants before storing it.
2. For short-term storage, it is recommended to immerse the probe into deionized water to
keep the plates wet. For long-term storage, after rinsing the probe thoroughly, the exterior
body should be wiped dry before storing it.

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ERROR DISPLAYS AND TROUBLESHOOTING
LCD display
ATC display
Mode
Possible cause(s) [Action(s)]
"TER.R" "OVE.R" Conductivity
Calibration
a. Temperature > 120.0°C.
[Bring solution to a lower
temperature.]
[Replace temperature probe.]
b. No temperature sensor.
[Use a temperature probe.]
"TER.R" "UND.R"
Conductivity
Calibration
Temperature < -10.0 °C.
[Bring solution to a higher
temperature.]
"OVE.R"
-10.0 to 120.0 °C
Conductivity
Calibration
Reading over user specified range.
[Change range to higher level]
"LER.R" -10.0 to 120.0 °C Conductivity
Calibration
Compensated Calibration exceeds
temperature limit.
[Increase or decrease the solution
temperature]
EEPROM : BAD Power-on
Unit has failed its EEPROM test.
[Turn meter OFF and back to ON
again.]
[Return for service. (see Warranty)]
ROM: BAD Power-on
Unit has failed its ROM test.
[Turn meter OFF and back to ON
again.]
[Return for service. (see Warranty)]
RAM: BAD Power-on
Unit has failed its RAM test.
[Turn meter OFF and back to ON
again.]
[Return for service. (see Warranty)]
SPECIFICATIONS
Conductivity
Range
Basic Cell K
Resolution
Accuracy
0 to 4750 uS/cm
0.475
1 uS/cm
0.5% ± 1 LSD
0.48 to 47.50 mS/cm
0.475
0.01 mS/cm
0.5% ± 1 LSD
4.8 to 200.0 mS/cm
0.475
0.1 mS/cm
0.5% ± 1 LSD
Salinity
Range
Basic Cell K
Resolution
Accuracy
0.0 to 2.5 ppt
0.475
0.1 ppt
0.5% ± 1 LSD
0.2 to 30.9 ppt
0.475
0.1 ppt
0.5% ± 1 LSD
2.6 to 70.0 ppt
0.475
0.1 ppt
0.5% ± 1 LSD
Temperature
Range
Resolution
Accuracy
-10.0 to 120.0 °C
0.1 °C
±0.3 °C

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Conductivity
Reference Temperature 10 °C to 29 °C (user selectable)
Temperature Coefficient 0.00 to 4.99% (user selectable)
Temperature Compensation Automatic
Temperature
Temperature sensor Thermistor, 10 kΩat 25 °C
4 - 20 mA Output
Current output range 4 - 20 mA (isolated)
Current output scale user programmable
Maximum load 500 Ω
Accuracy ±0.1 mA
Isolation voltage 500 VDC
Controller
Relays 3 (high or low) programmable relays
Control type ON/OFF control
Relay output 5 A at 115 VAC or 2.5 A at 220 VAC
GENERAL
Keys Audio feedback in all keys
Security protect 4-digit password
Communication RS485 (modbus)
Power: 115 VAC or 230 VAC 50/60 Hz
Power consumption 6 watts
Ambient temperature range 0.0 to 50.0 °C
Display: 128 x 64 graphic LCD w/backlight
Case IP65 ¼ DIN case, depth 148 mm
Weight 950 g