Hanna Instruments HI700221-1,HI700222-1,HI710221-1,HI710222-1 Instruction manual

HI700 / HI710 Series
Process,
Panel-mounted,
Microprocessor-based,
Conductivity and TDS Controllers
www.hannainst.com
Dear Customer,
Thank you for choosing a Hanna Instruments product.
This instruction manual has been written for the following products:
HI700221-α
EC controller with dual setpoint, ON/OFF and PID controls, analog
output.
HI700222-α
EC controller with dual setpoint, ON/OFF and PID controls, RS485
port.
HI710221-α
HI710222-α
EC and TDS controller with dual setpoint, ON/OFF and PID controls,
analog output.
EC and TDS controller with dual setpoint, ON/OFF and PID controls,
RS485 port.
α = 1 means 115 Vac, 50/60 Hz power supply
α = 2 means 230 Vac, 50/60 Hz power supply
Please read this instruction manual carefully before using the instrument. It will provide
you with the necessary information for the correct use of the instrument, as well as a
precise idea of its versatility.
If you need additional technical information, do not hesitate to e-mail us at:
[email protected].
All rights are reserved. Reproduction in whole or in part is prohibited without the written consent of the copyright owner,
Hanna Instruments Inc., Woonsocket, Rhode Island, 02895, USA.
TABLE OF CONTENTS
PRELIMINARY EXAMINATION. . . . . . . . . . . . . . . . . . . . . . . . . . . 4
GENERAL DESCRIPTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
FUNCTIONAL DESCRIPTION. . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
MECHANICAL DIMENSIONS. . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
SPECIFICATIONS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
INSTALLATION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
SETUP MODE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
CONTROL MODE. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
IDLE MODE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
ANALOG OUTPUT. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
RS 485 COMMUNICATION. . . . . . . . . . . . . . . . . . . . . . . . . . . 28
CALIBRATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
LAST CALIBRATION DATA. . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
FAULT CONDITIONS AND SELFTEST PROCEDURES. . . . . . . . . . . . . . . . 44
EXTERNAL FUNCTIONS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
STARTUP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49
EC VALUES AT VARIOUS TEMPERATURES. . . . . . . . . . . . . . . . . . . . 50
PROBE MAINTENANCE. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51
ACCESSORIES. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52
3
PRELIMINARY EXAMINATION
Remove the instrument from the packing material and examine it carefully. For further
assistance, please contact your local Hanna Instruments Office or email us at tech@
hannainst.com.
Note
Save all packing materials until you are sure that the instrument functions correctly.
Any damaged or defective items must be returned in their original packing materials
together with the supplied accessories.
GENERAL DESCRIPTION
HI700 and HI710 series are real time microprocessor-based EC or TDS controllers. They
provide accurate measurements, flexible ON/OFF or proportional control capabilities,
analog input and output, RS485 port, dual setpoint and alarm signal.
The system is composed of a case inside which the signal conversion circuitry, the
microprocessor circuitry and the output power drivers are contained.
MAIN FEATURES OF DIFFERENT MODELS
• Display: large LCD with 4 ½ 17 mm digits and 3 ½ 10 mm digits.
• LEDs: four LEDs are provided for signaling the energizing of relay 1 and 2 (yellow
LEDs) and alarm relays (a green and a red LED).
• Relays: 1 or 2 output relays for low conductivity or high conductivity dosage (COM, NO
and NC contacts) and 1 output relay for alarm condition (COM, NO and NC contacts).
• RS485 isolated communication link (HI700222 and HI710222 only).
• Calibration and Setup procedures allowed only through an unlock password.
• Calibration: 2 points with Hanna Instruments EC and TDS calibration solutions.
• Four different EC working ranges (0 to 199.9µS; 0 to 1999µS; 0 to 19.99mS; 0
to 199.9mS).
• Four different TDS working ranges (0 to 100.0ppm; 0 to 1000ppm; 0 to 10.00ppm;
0 to 100.0ppm) for HI710 models.
• Possibility to switch to TDS measurements with conversion factor from 0.00 to 1.00
(HI710 models only).
• Temperature compensation of the Hanna Instruments standard solutions.
4
• Temperature compensation of the EC and TDS reading with temperature coefficient
ß selectable from 0 to 10%/°C.
• Manual temperature setting when the temperature probe is not inserted or temperature
exceeds the upper range.
• Last calibration data internally recorded (non-volatile EEPROM memory): calibration
date and time, cell constant, calibration solution values.
• Input: 4-ring EC/TDS probe with cell constant 2.0 ± 10%, or 4-20mA analog input
from a transmitter.
• Output (HI700221 and HI710221 only):
- isolated 0-1 mA, 10 K maximum load (optional);
- isolated 0-20 mA, 750  maximum load (optional);
- isolated 4-20 mA, 750  maximum load (optional);
- isolated 0-5 VDC, 1 K minimum load (optional);
- isolated 1-5 VDC, 1 K minimum load (optional);
- isolated 0-10 VDC, 1 K minimum load (optional).
• Real time clock.
5
FUNCTIONAL DESCRIPTION
FRONT PANEL
1.
2.
3.
4.
5.
Liquid Crystal Display
SETUP key
CFM key
CAL key
 key
6. CAL DATA key
7.  key
8. LCD key
9.  key
10. LEDs
6
enters setup mode
confirms current choice (and skips to the next item)
initiates and exits calibration mode
increases the blinking digit/letter by one when selecting a parameter. Advances forward
while in last calibration data viewing mode. Increases the temperature setting when
temperature probe is not inserted
last calibration data viewing (enters and exits)
decreases the blinking digit/letter by one when selecting a parameter. Reverts backward
while in last calibration data viewing mode. Decreases the temperature setting when
temperature probe is not inserted
exits from setup and reverts back to normal mode (in idle or control phases with the
measurement on the display). During EC/TDS calibration, it alternates EC/TDS buffer
value and current cell constant on the display. In HI710 models only, it switches
between EC and TDS reading
moves to the next digit/letter (circular solution) when selecting a parameter. Same
as  key during last calibration data viewing mode
REAR PANEL
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
11.
12.
6-pin RS485 terminal
(HI700222 and HI710222 only)
Analog Output
(HI700221 and HI710221 only)
Power Supply
Alarm Terminal
Contact 2 - Second Dosing Terminal
Timer
Hold
Contact 1 - First Dosing Terminal
Pt 100 Temperature Sensor connector
EC/TDS probe connector
Power supply output for external transmitter
4-20 mA input from external transmitter
Unplug the meter before any electrical connection.
MECHANICAL DIMENSIONS
FRONT VIEW
SIDE VIEW
7
SPECIFICATIONS
Ranges
0.0 to 199.9 μS, 0 to 1999 μS
0.00 to 19.99 mS, 0.0 to 199.9 mS
0.0 to 100.0 ppm, 0 to 1000 ppm (HI710* only)
0.00 to 10.00 ppt, 0.0 to 100.0 ppt (HI710* only)
-10.0 to 100.0 °C
Resolution
0.1 μS, 1 μS, 0.01 mS, 0.1 mS
0.1 ppm, 1 ppm (HI 710 models only)
0.01 ppm, 0.1 ppm (HI 710 models only)
0.1 °C
Accuracy
(@20 °C/68 °F)
±0.5 % F.S. (EC and TDS)
±0.5 °C (0 to 70 °C), ±1 °C (outside)
Typical EMC Deviation
±2 % F.S. (EC and TDS) / ±0.5 °C
EC Calibration
Automatic or manual at 1 point
Temperature
Compensation
Automatic or manual, -10 to 100 °C with adjustable
temperature coefficient from 0.00 to 10.00%/ °C
TDS Factor (HI710 only) Adjustable from 0.00 to 1.00
Outputs
Analog: isolated 0-1 mA, 0-20 mA and 4-20 mA;
0-5 Vdc, 1-5 Vdc and 0-10 Vdc; or digital: RS485
Analog Input
4-20 mA
Setpoint Relay
2 contact outputs SPDT, 5A-250 Vac, 5A-30 Vdc
(resistive load). Fuse protected: 5A, 250V FUSE
Alarm Relay
Contact output SPDT, 5A-250 Vac, 5A-30 Vdc
(resistive load). Fuse protected: 5A, 250V FUSE
Power Supply
230 ±10% Vac or 115 ±10% Vac, 50/60 Hz
Power Consumption
15 VA
Over Current Protection
400 mA 250V FAST FUSE
Environment
0 to 50 °C (32 to 122 °F); RH max 95%
Installation Category
II
Enclosure
Single case ½ DIN
Dimensions
Panel cutout: 140 x 140 mm
Instrument: 144 x 144 x 170 mm
Weight
Approximately 1.6 kg. (3.5 lb.)
* Note: actual TDS range for HI710 models depends on TDS factor set.
8
INSTALLATION
HI700 and HI710 series offer a
multitude of possibilities, from
single and dual setpoints to
ON/OFF or PID dosage, isolated
outputs with user-selectable
zoom, bi-directional RS485,
recorder outputs in mAmps and
Volts. Use the 3-wire Pt 100
temperature sensor to compensate for the cable resistance
and have a precise automatic
temperature compensation of the
measurements in long distance
applications. See the diagram
for a recommended installation.
9
• Power Supply: Connect a 3-wire power cable to the terminal
strip, while paying attention to the correct live (L), earth (PE)
and neutral (N) terminal connections.
Power: 115 Vac -100 mA / 230 Vac - 50 mA.
Live Contact: fused inside 400 mA.
PE leakage current 1 mA; this contact must be connected to ground.
• Conductivity input: the default input is from conductivity probe. Connect the EC probe
to the terminals #10 on page 7. Connect the cable shield to pin 1, and the other
four wires according to the following table:
Color
Pin #
GREEN
2
WHITE
3
RED
4
BLUE
5
• Pt 100 Terminals: these contacts (#9 on page 7) connect the Pt 100 temperature
sensor for automatic temperature compensation of measurement. The HI7639
EC/TDS probe has a built-in 3-wire Pt 100 sensor to be connected according to the
following table:
Color
Pin #
GRAY
6
BROWN
7
YELLOW
8
If using a different Pt 100, separated from the conductivity probe, connect the cable
shield to pin 9, and the other wires as explained below.
In the case of a 2-wire sensor connect the Pt 100 to pins
6 and 8, and short pins 7 and 8 with a jumper wire.
Note
10
If the Pt 100 has more than 2 wires, connect the two wires of one end to pins 7 and
8 (pin 7 is an auxiliary input to compensate for the cable resistance) and one wire
from the other end to pin 6. Leave the fourth wire unconnected, if present.
If the meter does not detect the temperature probe, it will switch automatically to manual
temperature compensation with the temperature adjustable through the up and down
arrow keys. The “°C” symbol will blink on the LCD.
Note
All external cables to be connected to the rear panel should be
ended with cable lugs.
• Analog output: Connect an external recorder with a 2-wire
cable to these terminals (#2 on page 7) paying attention
to the correct polarity. A wide variety of output signals,
either in V or in mA, is available to fit most standards.
• Contact 1 and 2: Connect the dosing devices to these terminals (#5 and #8 on
page 7) in order to activate and deactivate them according to the selected control
parameters.
• mA Input: to switch to mA input signal from a conductivity
transmitter (e.g. HI8936, HI98143 or HI98144 series) see
setup procedure (code 6). Connect the two signal wires from the
transmitter to terminals #12 on page 7, paying attention to the
correct polarity.
An unregulated 10 to 30 VDC - 50 mA max. power supply output
(#11 on page 7) is provided to power the transmitter, if needed.
Once the installation is completed, select the appropriate working range, the reference
temperature (20 or 25 °C) and perform conductivity or TDS calibration as described in
this instruction manual. Set the control parameters according to the process.
11
SETUP MODE
HI700 and HI710 offer a multitude of possibilities from ON/OFF or PID dosage to
analog recorder output and from alarm to selftest features.
The Setup Mode allows the user to set all needed characteristics of the meter.
The setup mode is entered by pressing SETUP and entering the password when the
device is in idle or control mode.
Generally speaking, if the password is not inserted the user can only
view the setup parameters (except for password) without modifying
them (and the device remains in control mode). An exception is
certain setup items, or flags, which can activate special tasks when
set and confirmed.
Each setup parameter (or setup item) is assigned a two-digit setup code which is entered
and displayed on the secondary LCD.
The setup codes can be selected after password and CFM are pressed. When CFM is
pressed, the current setup item is saved on EEPROM and the following item is displayed.
Whenever LCD is pressed, the device reverts back
to control mode. The same is true when CFM is
pressed on the last setup item.
The possible transitions in setup mode are the
following:
ENTERING THE PASSWORD
• Press SETUP to enter the setup mode. The LCD will display “0000” on the upper part
and “PAS” on the lower. The first digit of the upper part of the LCD will blink.
• Enter the first value of the password by
the or keys.
• Then confirm the displayed digit with
one.
and move to the next
• When the whole password has been inserted, press CFM to confirm
it.
12
Note
The default password is set at “0000”.
• The LCD will display “SET” on the upper part and
“c.00” on the lower, allowing the user to edit setup
parameters (see table below).
• Enter the code of the parameter you want to set, using the arrow keys as per the
password procedure above (e.g. 41).
• Confirm the code by pressing CFM and the default or the previously memorized value
will be displayed with the first digit blinking.
Note
When the password is not inserted or a wrong password is confirmed, the display will
only show the previously memorized value, without blinking (read only mode). In this
case, the value cannot be set. Press LCD and start again.
• Enter the desired value using the arrow keys and then press CFM.
• After confirmation, the selected parameter is displayed.
The user can scroll through the parameters by pressing
CFM.
In order to directly set another parameter, press
SETUP again and enter the code or scroll to it by
pressing CFM.
The following table lists the setup codes along with
the description of the specific setup items, their valid values and whether password is
required to view that item (“PW” column):
13
Code
Valid Values
Default
PW
00 Factory ID
0 to 9999
0000
no
01 Process ID
0 to 99
00
no
02 Control enable/
disable
0: C.M. disabled
1: C.M. enabled
0
no
03 Range
(depends on mode)
1: 0.0-199.9 μS (or 100.0 ppm)
2: 0-1999 μS (or 1000 ppm)
3: 0.00-19.99 mS (or 10.00 ppt)
4: 0.0-199.9 mS (or 100.0 ppt)
4
no
04 Reference Temperature
20 °C or 25 °C
25°C
no
2.00
no
05 Temperature Coefficient 0.00 to 10.00 %/ °C
06 Input Selection
0: conductivity probe
1: 4-20 mA input signal
0
no
07 Temperature
compensation
ATC: Automatic
User: Manual
ATC
no
08 TDS Factor (HI710
only)
0.00 to 1.00
0.50
no
11 Relay 1 mode
(M1)
0: disabled
1: ON-OFF high setpoint
2: ON-OFF low setpoint
3: PID, high setpoint
4: PID, low setpoint
0
no
12 Relay 1 setpoint (S1)
0.5 to 99.5% full scale
25% f.s.
no
13 Relay 1 hysteresis (H1) 0 to 5% f.s.
1% f.s.
no
14 Relay 1 deviation (D1)
0.5 to 10% f.s.
1% f.s.
no
15 Relay 1 reset time
0.1 to 999.9 minutes
999.9
no
16 Relay 1 rate time
0.0 to 999.9 minutes
0.0
no
21 Relay 2 mode (M2)
same as relay 1
0
no
22 Relay 2 setpoint (S2)
0.5 to 99.5% full scale
75% f.s.
no
1% f.s.
no
23 Relay 2 hysteresis (H2) 0 to 5% f.s.
14
24 Relay 2 deviation (D2)
0.5 to 10% f.s.
1% f.s.
no
25 Relay 2 reset time
0.1 to 999.9 minutes
999.9
no
26 Relay 2 rate time
0.0 to 999.9 minutes
0.0
no
Code
Valid Values
Default PW
30 Relay 3 high alarm (HA)
0.5 to 99.5% full scale
HA-Hys≥A+Hys,Hys=1.5%f.s.
HA≥S1 or HA≥S2
95%
f.s.
no
31 Relay 3 low alarm (LA)
0.5 to 99.5% full scale
LA+Hys+HA-Hys
Hys=1.5%fs,LA+S1 or LA+S2
5% f.s.
no
32 Proportional control
mode period
1 to 30 min
5
no
33 Maximum relay ON time
(after which an alarm
mode is entered)
10 to 9999 min
60
no
34 Alarm mask time
00:00 to 30:00
00:00
no
0: 0-1mA
1: 0-20 mA
2: 4-20 mA
3: 0-5 VDC
4: 1-5 VDC
5: 0-10 VDC
2
no
0 to 100% full scale
(O_VARMIN T O_VARMAX-5% f.s.)
0
no
40 Analog output selection
41 Analog output
lower limit (O_VARMIN)
42 Analog output
0 to 100% full scale
100%
upper limit (O_VARMAX) (O_VARMIN T O_VARMAX - 5% f.s.) f.s.
no
60 Current day
01 to 31
from
RTC
no
61 Current month
01 to 12
from
RTC
no
62 Current year
1998 to 9999
from
RTC
no
63 Current time
00:00 to 23:59
from
RTC
no
71 Baud rate (RS485)
1200, 2400, 4800, 9600
9600
no
72 Cleaning timer
0 to 19999 days
0
no
73 Initial cleaning day
01 to 31
01
no
74 Initial cleaning month
01 to 12
01
no
15
Note
Code
Valid Values
Default
PW
75 Initial cleaning year
1998 to 9999
1998
no
76 Initial cleaning time
00:00 to 23:59
00:00
no
77 Cleaning ON interval
0 to 19999 minutes
0
no
90 Display selftest
0: off
1: on
0
yes
91 Keyboard selftest
0: off
1: on
0
yes
92 EEPROM selftest
0: off
1: on
0
yes
93 Relays and LEDs
selftest
0: off
1: on
0
yes
94 Watchdog selftest
0: off
1: on
0
yes
99 Unlock password
0000 to 9999
0000
yes
The process controller automatically checks to ensure that the entered data matches
other related variables. If a wrong configuration is entered, “ERROR” blinks on the LCD
to prompt the user. The correct configurations are the following:
If M1=
/ 0 then S1≤HA, S1≥LA;
If M2=
/ 0 then S2≤HA, S2≥LA;
If M1= 1 then S1-H1≥LA;
If M1= 2 then S1+H1≤HA;
If M1= 3 then S1+D1≤HA;
If M1= 4 then S1-D1≥LA;
If M2= 1 then S2-H2≥LA;
If M2= 2 then S2+H2≤HA;
If M2= 3 then S2+D2≤HA;
If M2= 4 then S2-D2≥LA;
If M1= 1 and M2 = 2
16
then S1-H1≥S2+H2, S2≥LA, HA≥S1;
If M1 = 2 and M2 = 1 then S2-H2≥S1+H1, S1≥LA, HA≥S2;
If M1 = 3 and M2 = 2 then S1≥S2+H2, S2≥LA, HA≥S1+D1;
If M1 = 2 and M2 = 3 then S1+H1≤S2, S1≥LA, HA≥S2+D2;
If M1 = 4 and M2 = 1 then S1≤S2–H2, S1–D1≥LA, HA≥S2;
If M1 = 1 and M2 = 4 then S1–H1≥S2, S2–D2≥LA, HA≥S1;
If M1 = 3 and M2 = 4 then S1≥S2, S2–D2≥LA, HA≥S1+D1;
If M1 = 4 and M2 = 3 then S2≥S1, S1–D1≥LA, HA≥S2+D2;
where the minimum deviation (D1 or D2) is 0.5% of the maximum range value.
Note
Note
When a wrong setup value is confirmed, the controller does
not skip to the next setup item but remains in the current item
displaying a flashing “ERROR” indicator until the parameter
value is changed by the user (the same is also true for the
setup code selection).
In some circumstances, the user cannot succeed in setting a parameter to a desired value
if the related parameters are not changed beforehand; e.g. to set a EC high setpoint to
10.0 mS the high alarm must be set to a value greater than 10.0 mS first.
17
CONTROL MODE
The control mode is the normal operational mode for these meters. During control mode
the meter fulfills the following main tasks:
• converts information from EC/TDS and temperature inputs to digital values;
• controls relays and generates the analog outputs as determined by the setup configuration, displays alarm condition;
In HI710 models it is possible to switch between EC and TDS reading pressing “LCD”.
The TDS value is obtained multiplying the EC measurement by the TDS factor set through
setup. The HI700 models display EC only.
The status of the meter is shown by the LED’s on the right.
STATUS
LEDs
Alarm LED (green) Relay LED (yellow) Red LED
Control
Alarm
OFF
----
ON
OFF
ON
ON
OFF
ON
ON or OFF
OFF
ON
ON
OFF
ON or OFF
Blinking
Meter exits control mode by pressing SETUP or CAL and confirming the password. Note
that this command generates a temporary exit. To deactivate the control mode definitively,
set CONTROL ENABLE to “0” (item # 02).
RELAY MODES
Once enabled, the relays 1 and 2 can be used in four
different modes:
1) ON/OFF, high setpoint (low conductivity dosage);
2) ON/OFF, low setpoint (high conductivity dosage);
3) PID, low setpoint (low conductivity dosage);
4) PID, high setpoint (high conductivity dosage).
An upper boundary is imposed for dosage time when relays are energized continuously,
i.e. when relay works in
ON/OFF mode or also in PID mode but in the latter case only if the relay is always ON. This
parameter can be set through setup procedure. When the maximum boundary is reached,
an alarm is generated; device stays in alarm condition until relay is de-energized.
ON/OFF CONTROL MODE
Either for mode 1 or 2 (high or low conductivity dosage) the user has to define the
following values through setup:
• relay setpoint (µS/mS/ppm value);
• relay hysteresis (µS/mS/ppm value).
18
Connect your device to the COM and NO (Normally Open) or NC
(Normally Closed) terminals.
The ON relay state occurs when relay is energized (NO and COM
connected, NC and COM disconnected).
The OFF relay state occurs when relay is de-energized (NO and
COM disconnected, NC and COM connected).
The following graphs show relay states along with EC measured value (similar graph
can be derived for TDS control).
As shown below, a high setpoint relay is activated when the measured EC exceeds the
setpoint and is deactivated when it is below the setpoint value minus hysteresis.
ON
OFF
Setpoint –
Hysteresis
Setpoint
EC
Such a behavior is suitable to control a high conductivity dosing pump.
A low setpoint relay as can be seen from the following graphs is energized when the
EC value is below the setpoint and is de-energized when the EC value is above the sum
of setpoint and the hysteresis. The low setpoint relay may be used to control a low
conductivity dosing pump.
ON
OFF
Setpoint
Setpoint +
Hysteresis
EC
P.I.D. CONTROL MODE
PID control is designed to eliminate the cycling associated with ON/OFF control in a
rapid and steady way by means of the combination of the proportional, integral and
derivative control methods.
With the proportional function, the duration of the activated control is proportional to
the error value (Duty Cycle Control Mode): as the measurement approaches setpoint,
the ON period diminishes.
The following graph describes the EC/TDS process controller behavior. Similar graph
may apply to the controller.
19
t0
t0+Tc
t0+2Tc
t0+3Tc
During proportional control the process controller calculates the relay activation time
at certain moments t0, t0+Tc, t0+2Tc etc. The ON interval (the shaded areas) is then
dependent on the error amplitude.
With the integral function (reset), the controller will reach a more stable output around
the setpoint providing a more accurate control than with the ON/OFF or proportional
action only.
The derivative function (rate action) compensates for rapid changes in the system reducing
undershoot and overshoot of the EC or TDS value.
During PID control, the ON interval is dependent not only on the error amplitude but even
on the previous measurements.
Definitely PID control provides more accurate and stable control than ON/OFF controllers
and it is best suitable in system with a fast response, quickly reacting to changes due
to addition of low or high conductivity solution.
An example of how the response overshoot can be improved with a proper rate action
setting is depicted in the following graphic.
EC
RATE ACTION COMPENSATES FOR RAPID CHANGES
t
PID TRANSFER FUNCTION
The transfer function of a PID control is as follows:
Kp + Ki/s + s Kd = Kp(1 + 1/(s Ti) +s Td)
with Ti = Kp/Ki, Td = Kd/Kp,
where the first term represents the proportional action, the second is the integrative
action and the third is the derivative action.
20
Proportional action can be set by means of the Proportional Band (PB). Proportional Band
is expressed in percentage of the input range and is related to Kp according to the following:
Kp = 100/PB.
Controller
output
0
Error
Proportional Band
The proportional action is set through the setup procedure as “Deviation” in percent of
full scale of the selected range.
Each setpoint has a selectable deviation: D1 for setpoint1 and D2 for setpoint2.
Two further parameters must be provided for both setpoints:
Ti = Kp/Ki, reset time, measured in minutes
Td = Kd/Kp, rate time, measured in minutes.
Ti1 and Td1 will be the reset time and rate time for setpoint1, while Ti2 and Td2 will
be the reset time and the rate time for setpoint2.
TUNING A PID CONTROLLER
The proportional, integrative, derivative terms must be tuned, i.e. adjusted to a particular
process. Since the process variables are not typically known, a “trial and error” tuning
procedure must be applied to get the best possible control for the particular process.
The target is to achieve a fast response time and a small overshoot.
Many tuning procedures are available and can be applied to the EC/TDS controllers. A
simple and profitable procedure is reported in this manual and can be used in almost
all applications.
The user can vary five different parameters, i.e. the setpoint (S1 or S2), the deviation
(D1 or D2), the reset time, the rate time and the proportional control mode period Tc
(from 1 to 30 minutes).
21
Note
User can disable the derivative and/or integrative action (for P or PI controllers) by
setting Td = 0 and/or Ti = MAX (Ti) respectively through the setup procedure.
SIMPLE TUNING PROCEDURE
The following procedure uses a graphical technique of analyzing a process response
curve to a step input.
1. Starting from a solution with an EC or TDS value quite different from the dosed liquid,
turn on the dosing device at its maximum capacity without the controller in the loop
(open loop process). Note the starting time.
2. After some delay (T0) the EC or TDS starts to vary. After more delay, the EC or TDS
will reach a maximum rate of change (slope). Note the time that this maximum slope
occurs and the EC or TDS value at which it occurs. Note the maximum slope in EC or
TDS per minute. Turn the system power off.
3. On the chart draw a tangent to the maximum slope point until intersection with the
horizontal line corresponding to the initial EC or TDS value. Read the system time
delay Tx on the time axis.
4. The deviation, Ti and Td can be calculated from the following:
• Deviation = Tx * max. slope (EC/TDS)
• Ti = Tx / 0.4 (minutes)
• Td = Tx * 0.4 (minutes).
5. Set the above parameters and restart the system with the controller in the loop. If the
response has too much overshoot or is oscillating, then the system can be fine-tuned
slightly increasing or decreasing the PID parameters one at a time.
22
Note
Connecting an external device (e.g. chart recorder) to the controller, the procedure is
easier and doesn’t need the use of hand plotting the process variable (EC or TDS).
ALARM RELAY
The alarm relay functions in the following manner:
FS•C = NO (Normally Open)
Energized Relay
COM
FS•O = NC (Normally Closed)
De-energized Relay
During alarm condition, the relay is de-energized. When not in alarm condition, the
relay is energized.
Example: High alarm set at 1400 µS
Low alarm set at 600 µS
An hysteresis will eliminate the possibility of continuous sequences
‘energizing/de-energizing’ of the alarm relay when the measured value is close to the
alarm setpoint. The alarm hysteresis amplitude is 1.5% of full scale.
Moreover the alarm signal is generated only after a user selectable time period
(alarm mask) has elapsed since the controlled value has overtaken one alarm threshold.
This additional feature will avoid fake or temporary alarm conditions.
Note
If the power supply is interrupted, the relay is de-energized as if in alarm condition to
alert the operator.
In addition to the user-selectable alarm relays, all EC/TDS controllers are equipped with
the Fail Safe alarm feature.
23
The Fail Safe feature protects the process against critical errors arising from power
interruptions, surges and human errors. This sophisticated yet easy-to-use system
resolves these predicaments on two fronts: hardware and software. To eliminate problems
of blackout and line failure, the alarm function operates in a “Normally Closed” state
and hence alarm is triggered if the wires are tripped, or
when the power is down. This is an important feature
since with most meters the alarm terminals close only
when an abnormal situation arises, however, due to line
interruption, no alarm is sounded, causing extensive
damage. On the other hand, software is employed to set
off the alarm in abnormal circumstances, for example,
if the dosing terminals are closed for too long a period.
In both cases, the red LED’s will also provide a visual
warning signal.
The Fail Safe mode is accomplished by connecting the external alarm circuit between
the FS•C (Normally Open) and the COM terminals. This way, an alarm will warn the
user when EC exceeds the alarm thresholds, during power down and in the case of a
broken wire between the process meter and the external alarm circuit.
Note
In order to have the Fail Safe feature activated, an external power supply has to be
connected to the alarm device.
CONTROL THROUGH ANALOG OUTPUT
Models HI700221 and HI710221 have a proportional analog signal (selectable
among 0-1mA, 0-20mA, 4-20mA, 0-5VDC, 1-5VDC and 0-10VDC) at the analog output
terminals. With this output, the actual output level amplitude is varied, rather than the
proportion of ON and OFF times (duty cycle control). A device with analog input (e.g. a
pump with a 4-20 mA input) can be connected to these terminals.
24
IDLE MODE
Idle mode is entered through setup code 2.
During idle mode the device performs the same tasks as when it is in control mode except
for the relays. The alarm relay is activated (no alarm condition), the control relays are
not activated while the analog output remains activated.
When the instrument is in idle mode the red and green status LEDs are on.
Idle mode is useful to disable control actions when the external devices are not installed
or when the user detects unusual circumstances.
Control actions are stopped as soon as the user
presses SETUP and enters the password.
In order to reactivate the control mode, use code
02 of setup (see “Setup” section). Otherwise, the
meter remains in idle mode.
25
ANALOG OUTPUT
HI700221 and HI710221 models are provided with the analog output feature.
The output is isolated and can be a voltage or a current.
With the recorder, simply connect the common port to
the ground output and the second port to the current
output or voltage output (depending on which parameter is being used) as depicted aside.
The type (voltage or current) and the range of the output
analog signal is selectable through the jumpers on the power board.
Configurations of the switch are as follows:
Output
0-5 VDC, 1-5 VDC
Switch 1
OFF
Switch 2
ON
Switch 3
––
Switch 4
––
0-10 VDC
ON
OFF
––
––
0-20 mA, 4-20 mA
––
––
ON
––
0-1 mA
––
––
OFF
––
Choice between different ranges with the same configuration (for example 0-20 mA
and 4-20 mA) is achieved via software by entering the setup mode and selecting code
40 (see Setup Mode section for exact procedure).
Factory default is switches 1 and 3 closed (ON) and switches 2 and 4 open (OFF), i.e.
0-20 mA, 4-20 mA and 0-10 VDC.
In any case, contact the nearest Hanna Instruments Customer Service Center for changing
of the default configuration.
By default the minimum and maximum values of analog output correspond to the
minimum and maximum of the selected range of the meter. For example, for the
HI700221 with a selected 0 to 1999 µS range and analog output of 4-20 mA, the
default values are 0 and 1999 µS corresponding to 4 and 20 mA, respectively
output matching a different EC or TDS range, for example, 4 mA = 30 mS and
20 mA = 50 mS.
To change the default values, the setup mode must be entered. Setup codes for changing
the analog output minimum and maximum are 41 or 42, respectively. For the exact
procedure, refer to the setup mode section in the manual.
26
Note
The analog output is factory calibrated through software. The user may
also perform the calibration procedure as explained in the following. It is
recommended to perform the output calibration at least once a year.
Note
Note
Analog output resolution is 1.5‰ f.s. with 0.5% f.s. accuracy.
The analog output is “frozen” when entering the setup or calibration mode
(after password confirmation).
27
RS 485 COMMUNICATION
HI700222 and HI710222 are provided with an RS485 port.
RS485 standard is a digital transmission method that allows long lines connections.
Its current-loop system makes this standard suitable for data transmission in noisy
environments.
Data transmission from the instrument to the PC is possible with the HI92500 Windows®
compatible application software offered by Hanna Instruments.
HI92500 offers a variety of features such as logging selected variables or plotting the
recorded data. It also has an on-line help feature to support you throughout the operation.
HI92500 makes it possible for you to use the powerful means of the most diffused
spreadsheet programs (Excel©, Lotus 1‑2‑3© etc.). Simply run your favorite spread
sheet and open the file downloaded by HI92500. It is then possible to elaborate the
data with your software (e.g. graphics, statistical analysis).
To allow our users access to the latest version of Hanna Instruments PC compatible
software, we made the products available for download at http://software.hannainst.
com. Select the product code and click Download Now.
After download is complete, use the setup.exe file to install the software.
SPECIFICATIONS
The RS485 standard is implemented in with the following characteristics:
Data rate:
up to 9600 bps
Communication:
Bi-directional Half-Duplex
Line length:
up to 1.2 Km typ. with 24AWG cable
Loads:
up to 32 typ.
Internal termination:
none
Excel© Copyright of “Microsoft Co.”
Lotus 1-2-3© Copyright of “Lotus Co.”
Windows® registered Trademark of “Microsoft Co.”
28
CONNECTIONS
The connections for the 6-pin RS485 terminal provided (#1 on page 7) are as
follows:
There is an internal short between the two A pins and between the two B pins.
The instrument has no internal line termination. To terminate the line, an external
resistor equal to the characteristic line impedance (typically 120Ω) must be added at
both ends of the line.
Up to 32 units can be connected to the same RS485 line, with a total line length of up
to 1.2 Km using 24AWG cable.
To minimize electromagnetic interferences, use shielded or twisted pair cable to connect
the units.
Each unit is identified by its process ID number (setup item “01”).
The controller acts as a “slave” device: it only answers to commands received from a
“master” device (e.g. an industrial PC) connected to the line.
As additional feature, the controller is also provided with two
pins (5V and 0V) in order to apply the Fail Safe Open Line
protection method. To avoid erroneous readings in OpenLine conditions, pull-up and pull-down resistors should be
connected as shown.
29
The Fail-Safe resistors are connected only to one unit in the line, and their value depends
on the application and characteristic impedance of the connection cable.
The RS485 port is optoisolated from measuring circuit and power line. The analog output
and RS485 port have the same ground.
RS485 PROTOCOL
The commands sent to the controller must have the following format:
• 2-digit process ID number
• 3-character command name
• Parameters (variable length, may be null)
• End of command (always the CR character,
Hex 0D)
A maximum time interval of 20 ms is allowed between two consecutive characters of
a command.
It is possible to send commands to change the controller settings or to simply ask
information on the controller status.
Following is the complete list of commands available:
30
Command
Parameter
Description
CAR
null
Request calibration data
GET
NN
Request setup item NN
K01
null
Same as CFM +
K02
null
Same as LCD+CAL+SETUP keys
KCD
null
Same as CAL DATA key
KCF
null
Same as CFM key
KCL
null
Same as CAL key
KDS
null
Same as LCD key
KDW
null
Same as key
KRG
null
Same as
KST
null
Same as SETUP key
KUP
null
Same as key
MDR
null
Request firmware code
ECR
null
Request EC reading
(in control or idle mode only)
TDR
null
Request TDS reading
(HI710 models only, available in
control or idle mode only)
RNG
null
Request measure Range
(in control or idle mode only
TMR
null
Request temperature reading
PWD
NNNN
Send the 4-digit password
NNPC1C2C3C4C5
Set setup item NN to the
PC1C2C3C4C5 value
P=+ if value is greater than 0
P=- if value is less than 0
C1 can be 0 or 1 only
C2C3C4C5 can be 0÷9 or blank
(the command is not available if
the controller is in setup mode)
SET
+CAL keys
key
31
Note
If the controller is not in control or idle mode and the temperature reading is requested
through the TMR command, the controller answers with the last acquired reading when
it was in control or idle mode.
Note
After a recognized PWD command is received, the controller allows a maximum of 1
minute without receiving data, after which it locks again and a new PWD command is
needed to perform password protected operations.
Following are examples of commands for setup items:
1) “03 SET 22-01200<CR>”
This command sets the setup item 22 (relay 2 setpoint) of a EC controller, identified
by the process ID number 03, to the +12.00 mS value.
2) “01 SET 33+005 ◊◊<CR>”
This command sets the setup item 33 (max. relay ON time) of a controller, identified
by the process ID number 01, to 5 minutes. The “◊” character means blank.
Once the controller has received a command, it answers with its 2-digit process ID
number followed by:
• ACK (Hex 06)
If the controller recognizes the received command and performs the requested
task;
• STX (Hex 02) , Data , ETX (Hex 03)
If the received command is a request of data;
• NAK (Hex 15)
If the received command is not recognized (e.g. the syntax is wrong);
• CAN (Hex 18)
If the controller cannot answer the request (e.g. the password was not sent,
the controller is in setup mode, the setup item is not available in that model,
etc.)
Note
32
The controller answers to the GET command with the same data format explained in
the SET command.
Following are examples of answers:
1) “03<STX>+01200<ETX>”
The controller with process ID number 03 says that its current setpoint is +12.00
mS.
2) “01<STX>UE71022225<ETX>”
The controller with process ID number 01 says that it is a HI710222 model with
firmware release 2.5.
The minimum delay between the last received character and first character of the
answer is 15 ms.
When the controller answers to the ECR, TDR and TMR commands, the reading is sent
as ASCII string followed by a character indicating the control and alarm status of the
controller. This character can assume the following values:
• “A”, control and alarm are ON;
• “B”, control and alarm are ON, and need update controller setup
(GET commands);
• “C”, control is ON and alarm is OFF;
• “D”, control is ON and alarm is OFF, and need update controller setup
(GET commands);
• “N”, control and alarm are OFF;
• “M”, control and alarm are OFF, and need update controller setup
(GET commands);
For example, a possible answer to the TMR command is:
“03<STX>10.7C<ETX>”
meaning that the current temperature reading is 10.7°C, the control action is active, no
alarm condition is present and controller setup is updated on PC.
“03<STX>10.7D<ETX>”
meaning that the current temperature reading is 10.7°C, the control action is active,
no alarm condition is present and controller setup is modified (must update controller
setup for PC - GET command for setup items).
33
If asking for last calibration data and the controller was never calibrated, it answers
with “0”; e.g. “01<STX>0<ETX>”.
If the controller was calibrated, it answers with “1” followed by the calibration data.
The Data field of the answer has the following format:
1<Date><Time><CellCostant>
• Date:
DDMMYY (e.g. “170400” for April 17,2000)
• Time:
HHMM (e.g. “1623” for 4:23 pm)
• Cell Costant: ASCII string (e.g. “1200”)
The items in the Data field are separated by blanks.
SETTING THE BAUD RATE
The transmission speed (baud rate) can be selected with the up and down keys; then
press the CFM key to store the new settings.
Available baud rates are: 1200, 2400, 4800 and 9600 bps.
34
CALIBRATION
The controller is factory calibrated for temperature as well as for the analog input and
outputs.
The user should periodically calibrate the instrument for EC or TDS. For greatest accuracy,
it is recommended that the instrument is calibrated frequently.
Before beginning normal operation,it is recommended to standardize the probe with
the Hanna Instruments calibration solution close to the expected sample value and
inside the selected range.
EC CALIBRATION
Range
Calibration point(s)
0.0 to 199.9 μS
84.0 μS
0 to 1999 μS
1413 μS
0.00 to 19.99 mS
5.00 - 12.88 mS
0.0 to 199.9 mS
80.0 - 111.8 mS
The user should select the appropriate range to calibrate (setup code 03). Calibration
must be performed for each range used.
The temperature probe should also be connected to the process meter. The meters are
equipped with a stability indicator. The user is also guided with indications on the display
during the calibration procedure.
Initial Preparation
Pour a small quantity of the calibration solution (e.g. 1413 µS) into a beaker. If possible,
use a plastic beaker to minimize any EMC interference.
For accurate calibration use two beakers containing the same solution, the first one for
rinsing the probe, the second one for calibration. By doing this, contamination between
the solutions is minimized.
To obtain accurate readings, use the calibration solution in the selected range and closer
to the values to be measured.
35
Offset Calibration
• To perform the EC calibration enter the calibration
mode, by pressing CAL and entering the password.
• After the correct password is entered, the control
actions stop and the primary LCD will display the first
calibration value, with the “CAL” indicator blinking.
The secondary LCD displays the temperature.
Note
If the wrong password is entered the system reverts
back to normal operation, displaying EC values.
• 0 is the default value for the 1st calibration point. Dry the conductivity probe and
leave it in air.
• Only when the reading is stable the “CAL” indicator
will stop flashing (after about 30 seconds) and the
“READY” and “CFM” indicators will start blinking.
• Press CFM to confirm the calibration point; the primary
LCD will display the second expected buffer value.
If the zero calibration cannot be performed,
“ERROR” will blink.
Cell constant calibration
• Select the solution value on the primary
display by pressing  or  if the selected
range has two possibilities (e.g. 5.000 and
12.880 mS).
• Immerse the EC/TDS probe with the temperature sensor in the selected solution. The
level of solution must be higher than the holes of the probe sleeve. Tap the probe
repeatedly on the bottom of the beaker and stir to ensure that no air bubbles are
trapped inside the sleeve.
• When the reading is stable, “CAL” will stop flashing
(after about 30 seconds) and the “READY” and
“CFM” indicators will blink.
• Press CFM to confirm the calibration point; if the
reading is close to the selected solution, the meter
stores the reading.
If the reading is not close to the selected solution,
“ERROR” will blink.
36
Note
A 2-point calibration is always suggested. However the EC calibration can also be performed at 1 point. To calibrate offset only, just press CAL after confirmation (with CFM)
of the zero reading; the meter will return to normal operational mode. To have the cell
constant calibrated first, press the up or down arrow keys after entering the calibration
procedure to skip to the next possible calibration buffer. In this case, after confirmation
of the cell constant, the meter will ask for the offset calibration displaying zero on the
LCD; press CAL to exit or calibrate the offset, if desired.
Note
The calibration value shown is referenced at 25 °C even if the reference temperature of
20 °C has been selected.
Note
During calibration, press LCD to display the cell constant value on the primary display.
Press LCD again to return to calibration buffer visualization.
Note
To interrupt the calibration procedure press SETUP to restart the procedure, or CAL to
exit to normal operational mode.
Note
If the process meter has never been calibrated or an EEPROM reset has occurred, the
meter continues to perform measurements. However, the user is informed of an EC or
TDS calibration requirement by a blinking “CAL” indication (see “Startup” section).
Note
The device must be calibrated within the temperature range specified for the EC or TDS
buffer solution.
CELL CONSTANT DIRECT SELECTION
Whenever the EC/TDS probe cell constant is known, it is possible to directly calibrate
the meter using that value.
• Press CAL to enter calibration mode. The LCD will show the default offset of 0.
• Press LCD to display the current cell constant on the primary LCD (factory default
value is 2.000 cm-1).
• Press SETUP key.
• Using ,  and , enter the probe cell constant (the value must be between
1.333 and 4.000 cm-1) and confirm by pressing CFM.
37
Note
Note
If the entered cell constant value is invalid, the “ERROR” indicator blinks on the LCD.
Press SETUP before CFM to exit without changing the cell constant.
CALIBRATION BUFFER DIRECT SELECTION
This feature allows to set a user-defined calibration point, in order to perform calibration
at a point different from the memorized standards.
• Press CAL to enter calibration mode. The LCD will show 0.
• Press SETUP key.
• Using ,  and , enter the desired buffer value and confirm by pressing CFM.
Note
Note
Press SETUP before CFM to exit without changes.
It is suggested to calibrate the offset before entering the calibration buffer direct selection.
TEMPERATURE CALIBRATION
The controller is factory calibrated for temperature. However, the user may also perform
a one point temperature calibration. This procedure is to calibrate the offset only; the
slope will remain as factory calibrated.
• Prepare a beaker containing a solution at a given temperature inside the range of
the meter.
• Use a Checktemp or a calibrated thermometer with a resolution of 0.1° as a reference
thermometer.
• Immerse the temperature probe in the beaker as
close to the Checktemp as possible.
• Press and hold first CFM and then CAL to enter the
temperature calibration mode.
• Execute the password procedure.
• Select code 1 via the arrow keys for temperature calibration and confirm with CFM.
38
• CAL will blink on the LCD. The measured temperature will be displayed on both the primary and
secondary LCD.
• Use the arrow keys to set on the secondary LCD the
temperature read by the reference thermometer.
• When the reading has stabilized at a value near the calibration point, CAL will stop
blinking and an intermittent CFM will prompt the user to confirm the calibration.
• If the reading stabilizes at a reading significantly variant from the first setpoint, an
intermittent ERROR will prompt the user to check the beaker or bath.
Calibration procedure may be interrupted by pressing CAL again at any time. If the
calibration procedure is stopped this way, or if the controller is switched off before the
last step, no calibration data is stored in non-volatile memory (EEPROM).
ANALOG INPUT CALIBRATION
The analog input is already factory calibrated. However, the user may also perform a
2-point calibration at 4 and 20 mA. It is sufficient to perform the calibration on one
range only.
• Connect a mA simulator (e.g. HI931002) to the analog input of the controller
(#12 at page 7)
• Press and hold first CFM and then CAL to enter the analog input calibration mode.
• Execute the password procedure.
• Select code 0 via the arrow keys
for analog input calibration and
confirm with CFM. CAL will blink
on the LCD.
• The secondary LCD will display
“4” for the first calibration point. The primary LCD
will display the conductivity reading.
• Set the mA simulator to 4 mA and wait for the reading to stabilize, CAL will stop
blinking and an intermittent CFM will prompt the user to confirm the calibration.
• If the reading stabilizes at a reading significantly variant from the first calibration
point, an intermittent ERROR will prompt the user to check the input.
Calibration procedure may be interrupted by pressing CAL again at any time. If the
calibration procedure is stopped this way, or if the controller is switched off before the
last step, no calibration data is stored in non-volatile memory (EEPROM).
39
• If everything is satisfactory the secondary LCD will
display “20” for the second calibration point.
• Set the mA simulator to 20 mA and wait for the reading to stabilize, CAL will stop
blinking and an intermittent CFM will prompt the user to confirm the calibration.
• Press CFM to confirm. The meter will return to normal
Calibration procedure may be interrupted by pressing CAL again at any time. If the
calibration procedure is stopped this way, or if the controller is switched off before the
last step, no calibration data is stored in non-volatile memory (EEPROM).
ANALOG OUTPUT CALIBRATION
IMPORTANT
In the meters where the analog output is available, this feature is factory calibrated
through software. The user may also perform these
calibration procedures.
It is recommended to perform the output calibration
at least once a year. Calibration should only be
performed after 10 minutes from power up.
• With a multimeter or an HI931002 connect the common port to the ground output
and the second port to the current output or voltage output (depending on which
parameter is being calibrated).
• Press and hold in sequence CFM first, then  and then CAL to enter the Analog
Output Calibration mode.
40
• Execute the password procedure.
• The primary display will show the current selected parameter blinking. Use the to
select the code (0-5 see chart below) for the desired parameter displayed on the
secondary display (e.g. 4-20 mA).
• Press CFM to confirm the selected parameter that will stop blinking on the primary
display. The secondary display shows the HI931002 or multimeter input value as
lower limit of the interval
• Use the  or  to make the HI931002 or multimeter output correspond with the
meter’s value shown on the secondary display (e.g. 4).
41
• Wait for approximately 30 seconds (until the reading of the calibrator is stable).
• Press CFM to confirm. The meter will switch to the second calibration point. Repeat
the above procedure.
• After the desired readings are obtained, press CFM and the meter will skip back to
normal operational mode.
Note
When adjusting values using the  or  keys it is important to allow for sufficient
response time (up to 30 seconds)
The table below lists the values of output codes along with the calibration point values
(which are the analog output minimum and the analog output maximum) as indicated
on the display.
The secondary display indicates the current calibration point value, while primary display
indicates the current calibration type.
OUTPUT
TYPE
42
CALIBRATION
CODE
CALIBRATION CALIBRATION
POINT1
POINT2
0-1 mA
0
0 mA
1 mA
0-20 mA
1
0 mA
20 mA
4-20 mA
2
4 mA
20 mA
0-5 Vdc
3
0 Vdc
5 Vdc
1-5 Vdc
4
1 Vdc
5 Vdc
0-10 Vdc
5
0 Vdc
10 Vdc
LAST CALIBRATION DATA
The meter can display the following last calibration data:
• Date
• Time
• Cell constant
While displaying these data, the controller remains in control mode. The data are related
to the selected range only.
The procedure below indicates the flow. Displaying of the items follows the above
sequence.
• To begin the cycle press CAL DATA. The last calibration date will appear on the primary
LCD as DD.MM format, while the secondary display will show the .year.
If the meter has never been calibrated or an EEPROM reset has occurred, no calibration
data are shown when CAL DATA is pressed. The “no CAL” message will blink for a
few seconds, then the meter skips back to normal mode.
• Press  or  to cycle through the data forward or backwards respectively.
Note
In any moment, by pressing LCD or CAL DATA the meter will return to the regular operating
display.
• Press  or  to view the time of last calibration.
The secondary display will show “HOU”.
• Press  or  again to view the cell constant at the
time of last calibration. The secondary display will show
“CEL”.
• Press  or  again to return to the first CAL DATA
display (date) at the time of last calibration.
43
FAULT CONDITIONS AND SELFTEST PROCEDURES
The fault conditions below may be detected by the software:
• EEPROM data error;
• I2C internal bus failure;
• date lost;
• code dead loop.
EEPROM data error can be detected through EEPROM test procedure at startup or when
explicitly requested using setup menu.
When an EEPROM error is detected, user is given the option to perform a reset of EEPROM.
Note
When an EEPROM reset has been performed calibration data
are reset to default (every range). An intermittent CAL will
blink on the display to advise the user of this status.
A I2C failure is detected when the I2C transmission is not
acknowledged or a bus fault occurs for more than a certain number of attempts (this
can be due, for example, to damage sustained by one of the ICs connected to I2C bus).
If so, the controller stops any tasks and displays a perpetual sliding message “Serial
bus error” (i.e. this is a fatal error).
If an invalid date is read from RTC, it is initialized back to the default date and time
(01/01/98 - 00:00).
The error detection for dead loops is performed by watchdog (see below).
You can use special setup codes, perform selftest procedures for LCD, keyboard, EEPROM,
relays and LEDs, watchdog. The operation of these functions is outlined in the setup
section. The selftest procedures are described in detail in the following subsections.
44
DISPLAY SELFTEST
The display selftest procedure consists of lighting up all of the display segments together.
The Display test is announced by a scrolling “Display test” message.
The segments are lit for a few seconds and then switched off before exiting the selftest
procedure.
KEYBOARD SELFTEST
The keyboard selftest procedure begins with the message “Button test, press LCD, CAL and
SETUP together to escape”. The LCD will then show only a colon.
As soon as one or more keys are pressed, the appropriate segments out of 88:88 corresponding to the pressed keys, will light up on the screen.
45
For example, if CFM and CAL DATA are pressed together the LCD will look like this:
The colon is a useful indicator for the correct position of squares.
Note
A maximum of two keys may be pressed simultaneously to be properly recognized.
To exit the keyboard test procedure press LCD, CAL and SETUP simultaneously.
EEPROM SELFTEST
The EEPROM selftest procedure involves verifying the stored EEPROM checksum. If the
checksum is correct the “Stored data good” message will be shown for a few seconds
before exiting selftest procedure.
If not, the message “Stored data error - Press  to reset stored data or  to ignore”.
46
If  is pressed the EEPROM selftest procedure terminates with no other action.
Otherwise, EEPROM is reset with default values from ROM as when a device with a
virgin EEPROM is switched on.
During EEPROM reset a blinking message “Set” is
shown on primary LCD; the secondary LCD displays
“MEM”.
At the end of this operation all the parameters are
reset to their default values. The calibrated cell
constant is also reset. For this reason the “CAL”
flag blinks until the EC/TDS calibration is performed.
RELAYS AND LEDS
Relays and LEDs selftests are executed as follows:
First all of the relays and LEDs are switched off, then they are switched on one at a time
for a few seconds and cyclically. User can interrupt the otherwise endless cycle pressing
any key, as indicated by the scrolling message.
Note
Relays and LEDs test has to be carried out with the relay contacts disconnected from
external plant devices.
47
WATCHDOG
When a dead loop condition is detected a reset is automatically invoked.
The effectiveness of watchdog capability can be tested through one of the special setup
items. This test consists of executing a dummy dead loop that causes watchdog reset
signal to be generated.
EXTERNAL FUNCTIONS
HOLD FUNCTION
This function allows to perform the maintenance procedures. When
the relevant digital insulated input (terminals #6 on page 7) is
on, the analog output is frozen at its last value and control and
alarm relays are disabled. The “Hld” indication is displayed on the
secondary LCD when the function is active. A 5 to 24 VDC voltage
can be applied to this input.
While in hold state, it is possible to display the temperature reading
on the secondary LCD pressing the right arrow key. Only when the
key is released, the secondary LCD returns automatically after a few
seconds to the “Hld” indication.
PRESETTABLE TIMER (CLEANING FUNCTION)
A timer is presettable by software to close a digital insulated
contact (terminals #5 on page 7) after a user programmable time
interval with a minimum interval of 1 day (e.g. for probe cleaning
function). The time interval is programmable in number of days
through setup code 72.
This output is ON for the period set through setup code 77 (this period can be also
changed when the output is ON).
The starting time of the cleaning timer can be set through setup codes 73, 74, 75 and 76.
48
STARTUP
During the automatic startup the Real Time Clock (RTC) is checked to see if a reset occurred
since last software initialization. In this case, the RTC is initialized with the default date
and time 01/01/1998 - 00:00. An EEPROM reset does not affect the RTC settings.
The EEPROM is also checked to see if it is new. If this is the case, the default values
are copied from ROM and then the device enters normal mode. Otherwise an EEPROM
checksum test is performed (the same is performed during EEPROM selftest procedure).
If checksum is correct, normal mode is entered, otherwise the user is asked whether the
EEPROM should be reset.
If EEPROM reset is requested, default values from ROM are stored into EEPROM as would
happen with a new EEPROM.
Note that EEPROM data is composed of setup data and calibration data. As for the setup
data, the calibration data is assigned default values when an EEPROM reset occurs. An
un-calibrated meter can perform measurement, though user is informed that EC or TDS
calibration is needed by means of a blinking “CAL”.
When the last calibration data is required, the “no CAL” message is displayed if no
calibration procedure was performed.
Unlike EC/TDS calibration, the user has no information on calibration need for other
ranges, other than the awareness that EEPROM was reset.
After an EEPROM reset, all calibrations (input and output) have to be performed in order
to obtain correct measurements.
49
EC VALUES AT VARIOUS TEMPERATURES
Temperature has a significant effect on conductivity. Table below shows EC values at
various temperatures for the Hanna Instruments calibration solutions.
TEMPERATURE
°C °F
50
EC VALUES (µS/cm)
HI7030 HI7031 HI7033 HI7034 HI7035 HI7039
HI8030 HI8031 HI8033 HI8034 HI8035 HI8039
0
32
7150
776
64
48300 65400
2760
5
41
8220
896
65
53500 74100
3180
10 50
9330
1020
67
59600 83200
3615
15 59
10480
1147
68
65400 92500
4063
16 60.8
10720
1173
70
67200 94400
4155
17 62.6
10950
1199
71
68500 96300
4245
18 64.4
11190
1225
73
69800 98200
4337
19 66.2
11430
1251
74
71300 100200
4429
20 68
11670
1278
76
72400 102100
4523
21 69.8
11910
1305
78
74000 104000
4617
22 71.6
12150
1332
79
75200 105900
4711
23 73.4
12390
1359
81
76500 107900
4805
24 75.2
12640
1386
82
78300 109800
4902
25 77
12880
1413
84
80000 111800
5000
26 78.8
13130
1440
86
81300 113800
5096
27 80.6
13370
1467
87
83000 115700
5190
28 82.4
13620
1494
89
84900 117700
5286
29 84.2
13870
1521
90
86300 119700
5383
30 86
14120
1548
92
88200 121800
5479
31 87.8
14370
1575
94
90000 123900
5575
PROBE MAINTENANCE
Probe can be compensated for normal contamination by a process of recalibration.
When calibration can no longer be achieved, remove the conductivity probe from the
system for maintenance.
PERIODIC MAINTENANCE
Inspect the probe and the cable. The cable used for the connection to the controller must
be intact and there must be no points of broken insulation on the cable.
Connectors must be perfectly clean and dry.
CLEANING PROCEDURE
Rinse the probe with tap water. If a more thorough cleaning is desired, remove the
sleeve and clean the platinum sensors with a non-abrasive cloth or HI7061 cleaning
solution. Reinsert the sleeve in the same direction as before.
Recalibrate the instrument before reinserting the probe in the system.
Note
Always recalibrate the instrument when attaching a new probe.
51
ACCESSORIES
CONDUCTIVITY CALIBRATION SOLUTIONS
HI7030M
HI7030L
HI8030L
HI7031M
HI7031L
HI8031L
HI7033M
HI7033L
HI8033L
HI7034M
HI7034L
HI8034L
HI7035M
HI7035L
HI8035L
HI7039M
HI7039L
HI8039L
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12880 μS/cm calibration solution, 230 mL bottle
12880 μS/cm calibration solution, 500 mL bottle
12880 μS/cm calibration solution, 500 mL FDA
bottle
1413 μS/cm calibration solution, 230 mL bottle
1413 μS/cm calibration solution, 500 mL bottle
1413 μS/cm calibration solution, 500 mL FDA
bottle
84 μS/cm calibration solution, 230 mL bottle
84 μS/cm calibration solution, 500 mL bottle
84 μS/cm calibration solution, 500 mL FDA bottle
80000 μS/cm calibration solution, 230 mL bottle
80000 μS/cm calibration solution, 500 mL bottle
80000 μS/cm calibration solution, 500 mL FDA
bottle
111800 μS/cm calibration solution, 230 mL bottle
111800 μS/cm calibration solution, 500 mL bottle
111800 μS/cm calibration solution, 500 mL FDA
bottle
5000 μS/cm calibration solution, 230 mL bottle
5000 μS/cm calibration solution, 500 mL bottle
5000 μS/cm calibration solution, 500 mL FDA
bottle
PROBE CLEANING SOLUTIONS
HI7061M
HI8061M
HI7061L
HI8061L
General cleaning solution, 230 mL bottle
General cleaning solution, 230 mL FDA
bottle
General cleaning solution, 500 mL bottle
General cleaning solution, 500 mL FDA
bottle
53
OTHER ACCESSORIES
4-ring conductivity probe with built-in 3-wire Pt100 temperature
sensor and 5 m (16.5’) cable
4-ring conductivity probe with standard 1/2’’ external thread
HI3011
for flow-thru mounting and 3 m (10’) cable
4-ring conductivity probe with standard 1/2’’ external thread
HI3012
for submersion applications and 3 m (10’) cable
Stainless steel Pt100 probe with standard 1/2’’ external threads
HI5001/5
at both ends for in-line and immersion installation; 5 m (16.5’)
cable
BL PUMPS
Dosing pumps with flow rate from 1.5 to 20 lph
HI98501 ChecktempC
Electronic thermometer (range -50.0 to 150.0 °C)
HI8936A
EC transmitter, 0.0 to 199.9 mS/cm
HI8936B
EC transmitter, 0.00 to 19.99 mS/cm
HI8936C
EC transmitter, 0 to 1999 μS/cm
HI8936D
EC transmitter, 0.0 to 199.9 μS/cm
HI98143 series (4-20mA) EC isolated transmitter, 0 to 10 mS/cm
HI931002
4-20 mA simulator
HI7639
54
RECOMMENDATIONS FOR USERS
Before using this product, make sure it is entirely suitable for your specific application and for the environment in which it is used. Any variation introduced by the
user to the supplied equipment may degrade the meters' performance. For yours
and the meter's safety do not use or store the meter in hazardous environments.
CERTIFICATION
All Hanna Instruments conform to the CE European Directives.
Disposal of Electrical & Electronic Equipment. The product should not be
treated as household waste. Instead hand it over to the appropriate collection
point for the recycling of electrical and electronic equipment which will conserve
natural resources.
Disposal of waste batteries. This product contains batteries, do not dispose
of them with other household waste. Hand them over to the appropriate
collection point for recycling.
Ensuring proper product and battery disposal prevents potential negative
consequences for the environment and human health. For more information,
contact your city, your local household waste disposal service, the place of
purchase or go to www.hannainst.com.
WARRANTY
All Hanna Instruments meters are guaranteed for two years against defects in
workmanship and materials when used for their intended purpose and maintained according to instructions.
The probes are guaranteed for a period of six months. This warranty is limited to
repair or replacement free of charge. Damage due to accident, misuse, tampering
or lack of prescribed maintenance are not covered.
If service is required, contact your local Hanna Instruments Office. If under
warranty, report the model number, date of purchase, serial number and the
nature of the failure. If the repair is not covered by the warranty, you will be
notified of the charges incurred.
If the instrument is to be returned to Hanna Instruments, first obtain a Returned
Goods Authorization number from the Customer Service department and then
send it with shipping costs prepaid. When shipping any instrument, make sure
it is properly packaged for complete protection.
Hanna Instruments reserves the right to modify the design,
construction or appearance of its products without advance notice.
55
World Headquarters
Hanna Instruments Inc.
Highland Industrial Park
584 Park East Drive
Woonsocket, RI 02895 USA
www.hannainst.com
Printed in ROMANIA
MANHI700 06/19
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