HI 700 / HI 710 Series
Process,
Panel-mounted,
Microprocessor-based,
Conductivity and TDS
Controllers
Instruction Manual
Dear Customer,
Thank you for choosing a Hanna Product.
This instruction manual has been written for the following
products:
HI 700221 EC controller with dual setpoint, ON/OFF
and PID control, analog output.
HI 700222 EC controller with dual setpoint, ON/OFF
and PID control, RS485 port.
HI 710221 EC and TDS controller with dual setpoint,
ON/OFF and PID control, analog output.
HI 710222 EC and TDS controller with dual setpoint,
ON/OFF and PID control, RS485 port.
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 tech@hannainst.com.
These instruments are in compliance with the directives.
© 2001 Hanna Instruments
All rights are reserved. Reproduction in whole or in part is prohibited without the written
consent of the copyright owner, Hanna Instruments Inc., 584 Park East Drive, Woonsocket, Rhode Island, 02895 , USA.
2
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 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
ANALOG OUTPUT . . . . . . . . . . . . . . . . . . . . . . . . 27
RS 485 COMMUNICATION . . . . . . . . . . . . . . . . . . 29
CALIBRATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
LAST CALIBRATION DATA . . . . . . . . . . . . . . . . . . . . 44
FAULT CONDITIONS AND SELFTEST PROCEDURES . . 45
EXTERNAL FUNCTIONS . . . . . . . . . . . . . . . . . . . . . 48
STARTUP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49
EC VALUES AT VARIOUS TEMPERATURES. . . . . . . . . 50
EC/TDS PROBE MAINTENANCE . . . . . . . . . . . . . . . . 51
ACCESSORIES . . . . . . . . . . . . . . . . . . . . . . . . . . . 52
WARRANTY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54
CE DECLARATION OF CONFORMITY. . . . . . . . . . . 56
3
PRELIMINARY EXAMINATION
Remove the instrument from the packing material and examine it carefully to make sure that no damage has occurred
during shipping. If there is any noticeable damage, notify
your Dealer or the nearest Hanna Customer Service Center
immediately.
Note Save all packing materials until you are sure that the instru-
ment functions correctly. Any damaged or defective items must
be returned in their original packing materials together with
the supplied accessories.
GENERAL DESCRIPTION
HI 700 and HI 710 series are real time microprocessorbased 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 (HI 700222 and HI
710222 only).
• Calibration and Setup procedures allowed only through
an unlock password.
• Calibration: 2 points with Hanna EC and TDS calibration
solutions.
4
• 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 HI 710
models.
• Possibility to switch to TDS measurements with conversion
factor from 0.00 to 1.00 (HI 710 models only).
• Temperature compensation of the HANNA standard solutions.
• 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 (HI 700221 and HI 710221 only):
- isolated 0-1 mA, 10 KΩ maximum load (optional);
- isolated 0-20 mA, 750 Ω maximum load (optional);
- isolated 4-20 mA, 750 Ω maximum load (optional);
- isolated 0-5 VDC, 1 KΩ minimum load (optional);
- isolated 1-5 VDC, 1 KΩ minimum load (optional);
- isolated 0-10 VDC, 1 KΩ minimum load (optional).
• Real time clock.
5
FUNCTIONAL DESCRIPTION
FRONT PANEL
1. Liquid Crystal Display
2. SETUP key enters setup mode
3. CFM key confirms current choice (and skips to the next item)
4. CAL key initiates and exits calibration mode
5. key 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
6. CAL DATA key last calibration data viewing (enters and exits)
7. key 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
8. LCD key 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 HI 710
models only, it switches between EC and TDS reading
9. key moves to the next digit/letter (circular solution) when selecting a parameter. Same as key during last calibration
data viewing mode
10. LEDs
6
REAR PANEL
1. 6-pin RS485 terminal (HI 700222 and HI 710222 only)
2. Analog Output (HI 700221 and HI 710221 only)
3. Power Supply
4. Alarm Terminal
5. Contact 2 - Second Dosing Terminal
6. Timer
7. Hold
8. Contact 1 - First Dosing Terminal
9. Pt 100 Temperature Sensor connector
10. EC/TDS probe connector
11. Power supply output for external transmitter
12. 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
Resolution 0.1 µS, 1 µS
Accuracy ±0.5 % full scale (EC and TDS)
(@20°C/68°F) ±0.5°C between 0 to 70°C, ±1°C outside
Temperature Compensation Automatic from -10 to 100°C or manual with
Typical EMC Deviation ±2 % full scale (EC and TDS)
Installation Category II
Probe HI 7639
Analog Input 4 - 20 mA
Power Supply 230 ±10% VAC or 115 ±10% VAC, 50/60 Hz
Power Consumption 15 VA
Over Current Protection 200 mA 250V FAST FUSE
Relays 1 and 2 Electromechanical relay SPDT contact outputs,
Alarm Relay Electromechanical Relay SPDT contact output,
Environment 0-50 °C; max 95% R.H. non-condensing
Enclosure single case ½ DIN
Weight approximately 1.6 kg. (3.5 lb.)
0.00 to 19.99 mS, 0.0 to 199.9 mS
0.0 to 100.0 ppm, 0 to 1000 ppm (HI 710* models only)
0.00 to 10.00 ppt, 0.0 to 100.0 ppt (HI 710* models only)
-10.0 to 100.0 °C
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
Temperature Coefficient from 0.00 to 10.00%/°C
±0.5 °C
4-ring EC/TDS probe (K=2) with built-in 3-wire PT100
temperature sensor and 5 mt shielded cable
5A-250 VAC, 5A - 30 VDC (resistive load)
Fuse protected: 5A, 250V FUSE
5A - 250 VAC, 5A - 30 VDC (resistive load)
Fuse protected: 5A, 250V FUSE
* Note: actual TDS range for HI 710 models depends on TDS factor set.
8
INSTALLATION
HI 700 and HI 710
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: 115VAC -100 mA / 230VAC - 50 mA.
Live Contact: fused inside 200mA.
PE leakage current 1 mA; this contact must be con-
nected 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.
10
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.
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.
Note 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
HI 700 and HI 710 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
• Enter the first value of the pass-
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“0000” on the upper part and “PAS” on the lower. The first
digit of the upper part of the LCD will blink.
word by the or keys.
• Then confirm the displayed digit with
and move to the next one.
• When the whole password has been
inserted, press CFM to confirm it.
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.
13
• 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):
Code Valid Values Default PW
00 Factory ID 0 to 9999 0000 no
01 Process ID 0 to 9999 0000 no
02 Control enable/disable 0: C.M. disabled 0 no
1: C.M. enabled
03 Range 1: 0.0-199.9 µS (or 100.0 ppm) 4 no
(depends on model) 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)
04 Reference Temperature 20°C or 25°C 25°C no
14
05 Temperature Coefficient 0.00 to 10.00 %/°C 2.00 no
06 Input Selection 0: conductivity probe 0 no
1: 4-20 mA input signal
07 Temperature ATC: Automatic ATC no
compensation User: Manual
08 TDS Factor (HI710 only) 0.00 to 1.00 0.50 no
11 Relay 1 mode 0: disabled 0 no
(M1) 1: ON-OFF high setpoint
2: ON-OFF low setpoint
3: PID, high setpoint
4: PID, low setpoint
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
Code Valid Values Default PW
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
23 Relay 2 hysteresis (H2) 0 to 5% f.s. 1% f.s. no
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
30 Relay 3 high alarm (HA) 0.5 to 99.5% full scale 95% f.s. no
HA-HysULA+Hys,Hys=1.5%f.s.,HAUS1 or HAUS2
31 Relay 3 low alarm (LA) 0.5 to 99.5% full scale 5% f.s. no
LA+HysTHA-Hys,Hys=1.5%f.s.,LATS1 or LATS2
32 Proportional control 1 to 30 min 5 no
mode period
33 Maximum relay ON time 1 to 10 min 10 no
(after which an alarm mode is entered)
34 Alarm mask time 00:00 to 30:00 00:00 no
40 Analog output selection 0: 0-1mA 2 no
1: 0-20 mA
2: 4-20 mA
3: 0-5 VDC
4: 1-5 VDC
5: 0-10 VDC
41 Analog output 0 to 100% full scale 0 no
lower limit (O_VARMIN) (O_VARMIN T O_VARMAX - 5% f.s.)
42 Analog output 0 to 100% full scale 100% f.s. no
upper limit (O_VARMAX) (O_VARMIN T O_VARMAX - 5% f.s.)
15
Code Valid Values Default PW
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
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 0 yes
1: on
91 Keyboard selftest 0: off 0 yes
1: on
92 EEPROM selftest 0: off 0 yes
1: on
16
93 Relays and LEDs selftest 0: off 0 yes
1: on
94 Watchdog selftest 0: off 0 yes
1: on
99 Unlock password 0000 to 9999 0000 yes
Note 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 S1THA, S1ULA;
If M2=/ 0 then S2THA, S2ULA;
If M1= 1 then S1-H1ULA;
If M1= 2 then S1+H1THA;
If M1= 3 then S1+D1THA;
If M1= 4 then S1-D1ULA;
If M2= 1 then S2-H2ULA;
If M2= 2 then S2+H2THA;
If M2= 3 then S2+D2THA;
If M2= 4 then S2-D2ULA;
If M1= 1 and M2 = 2
then S1-H1US2+H2, S2ULA, HAUS1;
If M1 = 2 and M2 = 1
then S2-H2US1+H1, S1ULA, HAUS2;
If M1 = 3 and M2 = 2
then S1US2+H2, S2ULA, HAUS1+D1;
If M1 = 2 and M2 = 3
then S1+H1TS2, S1ULA, HAUS2+D2;
If M1 = 4 and M2 = 1
then S1TS2–H2, S1–D1ULA, HAUS2;
If M1 = 1 and M2 = 4
then S1–H1US2, S2–D2ULA, HAUS1;
If M1 = 3 and M2 = 4
then S1US2, S2–D2ULA, HAUS1+D1;
If M1 = 4 and M2 = 3
then S2US1, S1–D1ULA, HAUS2+D2;
where the minimum deviation (D1 or D2) is 0.5% of the maxi-
mum range value.
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).
Note 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
• controls relays and generates the analog outputs as deter-
In HI 710 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 HI 700 models display EC only.
The status of the meter is shown by the LED’s on the right.
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).
to digital values;
mined by the setup configuration, displays alarm condition;
STATUS LEDs
Control Alarm Alarm LED (green) Relay LED (yellow) Red LED
OFF ---- O N OF F O N
ON OFF ON ON or OFF OFF
ON ON OFF ON or OFF Blinking
RELAY MODES
18
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).
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
19
control a low conductivity dosing pump.
ON
OFF
P.I.D. CONTROL MODE
Setpoint
Setpoint +
Hysteresis
EC
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.
t
0
t0+T
t0+2T
c
t0+3T
c
c
During proportional control the process controller calculates
the relay activation time at certain moments t0, t0+Tc, t0+2T
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 ad-
c
20
dition 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:
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.
Kp + Ki/s + s Kd = Kp(1 + 1/(s Ti) +s Td)
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.
100%
Controller
output
0
Proportional Band
Error
21
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).
22
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.
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).
23
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 µ S
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.
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.
24
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 HI 700221 and HI 710221 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.
25
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.
26
ANALOG OUTPUT
HI 700221 and HI 710 221 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 Switch 1 Switch 2 Switch 3 Switch 4
0-5 VDC, 1-5 VDC OFF O N – – – –
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 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 HI 700221 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.
27
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.
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 Analog output resolution is 1.5‰ f.s. with 0.5% f.s. accu-
racy.
Note The analog output is “frozen” when entering the setup or
calibration mode (after password confirmation).
28
RS 485 COMMUNICATION
HI 700222 and HI 710222 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 HI 92500 Windows® compatible application software offered by Hanna Instruments.
The user-friendly HI 92500 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.
HI 92500 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 HI 92500. It is then possible to elaborate the data with your software (e.g. graphics, statistical
analysis).
To install HI 92500 you need a 3.5" drive and few minutes
to follow the instructions conveniently printed on the disk’s
label.
Contact your Hanna Dealer to request a copy.
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.”
29
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.
30
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.
RS485 PROTOCOL
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 Open-Line conditions, pullup and pull-down resistors should be
connected as shown.
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.
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:
31
Command Parameter Description
CAR null Request calibration data
GET NN Request setup item NN
K01 null Same as CFM++CAL keys
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 key
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 modeonly)
TDR null Request TDS reading
(HI 710 models only, available in
control or idle mode only)
32
RN G null Request measure Range
(in control or idle mode only)
TMR null Request temperature reading
PWD NNNN Send the 4-digit password
SET NNPC1C2C3C4C
Set setup item NN to the
5
PC1C2C3C4C
value
5
P=+ if value is greater than 0
P=
-
if value is less than 0
C
can be 0 or 1 only
1
C2C3C4C
can be 0÷9 or blank
5
(the command is not available if
the controller is in setup mode)
Note If the controller is not in control or idle mode and the tem-
perature 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.)
33
Note 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 minum 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 con-
troller setup (GET commands);
• “C”, control is ON and alarm is OFF;
• “D”, control is ON and alarm is OFF, and need up-
date controller setup (GET commands);
• “N”, control and alarm are OFF;
• “M”, control and alarm are OFF, and need update
controller setup (GET commands);
34
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
SETTING THE BAUD RATE
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).
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.
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.
35
These values can be changed by the user to have the analog
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 calibration solution close
to the expected sample value and inside the selected range.
EC AND TDS CALIBRATION
The calibration points for EC and TDS are as follows:
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.
Range Calibration point(s)
0.0÷199.9 µS 84.0 µS
0÷1999 µS 1413 µS
0.00÷19.99 mS 5.00 - 12.88 mS
0.0÷199.9 mS 80.0 - 111.8 mS
0.0÷100.0 ppm 42.0 ppm
0÷1000 ppm 800 ppm
0.00÷10.00 ppt 6.44 ppt
0.0÷100.0 ppt 55.9 ppt
36
Offset Calibration
Note If the wrong password is entered the system reverts back to
Cell constant calibration
To obtain accurate readings, use the calibration solution in
the selected range and closer to the values to be measured.
• To perform the EC or TDS 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
EC or TDS calibration value, with
the "CAL" indicator blinking. The secondary LCD displays the
temperature.
normal operation, displaying EC or TDS 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.
• 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
37
than the holes of the EC/TDS probe
sleeve. Tap the EC/TDS 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.
Note A 2-point calibration is always suggested. However the EC/
TDS 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.
38
Note The EC or TDS 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 EE-
PROM 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.
Note If the entered cell constant value is invalid, the “ERROR” indi-
cator blinks on the LCD.
Note 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
39
confirm by pressing CFM.
Note Press SETUP before CFM to exit without changes.
Note It is suggested to calibrate the offset before entering the cali-
bration 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.
• 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).
40
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.
• 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 operational mode.
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).
41
ANALOG OUTPUT CALIBRATION
In the meters where the analog output is available, this feature is factory calibrated through software. The user may also
perform these calibration procedures.
IMPORTANT It is recommended to perform the out-
put calibration at least once a year.
Calibration should only be performed
after 10 minutes from power up.
• With a multimeter or an HI 931002 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.
• 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).
42
• Press CFM to confirm the selected parameter that will stop
blinking on the primary display. The secondary display shows
the HI 931002 or multimeter input value as lower limit of
the interval.
• Use the or to make the
HI 931002 or multimeter output correspond with the meter’s
value shown on the secondary display (e.g. 4).
• 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 CALIBRATION CALIBRATION CALIBRATION
TYP E CODE POINT 1 POINT 2
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
43
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.
44
• 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.
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 per-
formed 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).
DISPLAY SELFTEST
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.
The display selftest procedure consists of lighting up all of the
display segments together. The Display test is announced by a
45
KEYBOARD SELFTEST
scrolling "Display test" message.
The segments are lit for a few seconds and then switched off
before exiting the selftest procedure.
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.
46
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”.
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
Note Relays and LEDs test has to be carried out with the relay
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.
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
calibration solutions.
TEMPERATURE EC VALUES (µS/cm)
°C °F 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
50
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
EC / TDS 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 & TDS CALIBRATION SOLUTIONS
HI 7030L 12880 µS/cm (µmho/cm), 460mL
HI 7030M 12880 µS/cm (µmho/cm), 230mL
HI 7031L 1413 µS/cm (µmho/cm), 460mL
HI 7031M 1413 µS/cm (µmho/cm), 230mL
HI 7033L 84 µS/cm (µmho/cm), 460 mL
HI 7033M 84 µS/cm (µmho/cm), 230 mL
HI 7034L 80000 µS/cm (µmho/cm), 460mL
HI 7034M 80000 µS/cm (µmho/cm), 230mL
HI 7035L 111800 µS/cm (µmho/cm), 460mL
HI 7035M 111800 µS/cm (µmho/cm), 230mL
HI 7039L 5000 µS/cm (µmho/cm), 460mL
HI 7039M 5000 µS/cm (µmho/cm), 230mL
HI 7032L 1382 ppm (mg/L), 460 mL
HI 7032M 1382 ppm (mg/L), , 230 mL
HI 7036L 12.41 ppt (g/L), 460 mL
HI 7036M 12.41 ppt (g/L), 230 mL
HI 70038P 6.44 ppt (g/L), 25 mL sachets, 25 pcs.
HI 70080P 800 ppm (mg/L), 25 mL sachets, 25 pcs.
HI 7042 42 ppm (mg/L), 1 L
HI 7038 6.44 ppt (g/L), 1 L
HI 7037 800 ppm (mg/L), 1 L
HI 7055 55.9 ppt (g/L), 1 L
CONDUCTIVITY CALIBRATION SOLUTIONS IN FDA APPROVED BOTTLES
HI 8030L 12880 µS/cm (µmho/cm), 460 mL
HI 8031L 1413 µS/cm (µmho/cm), 460 mL
HI 8033L 84 µS/cm (µmho/cm), 460 mL
HI 8034L 80000 µS/cm (µmho/cm), 460 mL
HI 8035L 111800 µS/cm (µmho/cm), 460 mL
HI 8039L 5000 µS/cm (µmho/cm), 460 mL
52
ELECTRODE CLEANING SOLUTIONS
HI 7061M General Cleaning Sol., 230 mL
HI 7061L General Cleaning Sol., 460 mL
ELECTRODE CLEANING SOLUTIONS IN FDA APPROVED BOTTLES
HI 8061M General Cleaning Sol., 230 mL
HI 8061L General Cleaning Sol., 460 mL
OTHER ACCESSORIES
HI 7639 4-ring EC/TDS probe with built-in 3-wire PT100 temperature
sensor and 5 m (16.5’) shielded cable
HI 3011 4-ring EC/TDS probe with standard 1/2’’ external thread for
flow-thru mounting and 3 m (10’) cable
HI 3012 4-ring EC/TDS probe with standard 1/2’’ external thread for
submersion applications and 3 m (10’) cable
HI 5001/5 Stainless steel Pt100 probe with standard 1/2’’ external threads
on 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
ChecktempC Stick Thermometer (range -50.0 to 150.0°C)
HI 8936A EC Transmitter 0.0-199.9 mS/cm
HI 8936B EC Transmitter 0.00-19.99 mS/cm
HI 8936C EC Transmitter 0-1999 µS/cm
HI 8936D EC Transmitter 0.0-199.9 µS/cm
HI 98143 series (4-20mA) EC Isolated Transmitter 0-10 mS/cm
HI 931002 4-20 mA Simulator
53
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 the dealer from whom you purchased the instrument. 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.
54
Hanna Instruments reserves the right to modify the design,
construction and appearance of its products without ad-
vance notice.
CE DECLARATION OF CONFORMITY
Recommendations for Users
Before using these products, make sure that they are entirely suitable for
the environment in which they are used.
Operation of these instruments in residential areas could cause unaccept-
able interferences to radio and TV equipment.
To maintain the EMC performance of equipment, the recommended
cables noted in the user's manual must be used.
Any variation introduced by the user to the supplied equipment may
degrade the instruments' EMC performance.
To avoid electrical shock, do not use these instruments when voltage at
the measurement surface exceed 24VAC or 60VDC.
To avoid damage or burns, do not perform any measurement in
microwave ovens.
Unplug the instruments from power supply before the replacement of the
fuse.
External cables to be connected to the rear panel should be terminated
with cable lugs.
55
MANHI700R1
02/03
www.hannainst.com
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