Hanna Instruments | HI9910-1,HI9911-1,HI9920-1 | Owner Manual | Hanna Instruments HI9910-1,HI9911-1,HI9920-1 Owner Manual

Hanna Instruments HI9910-1,HI9911-1,HI9920-1 Owner Manual
Instruction Manual
HI9910 • HI9911
HI9920
Wall Mounted
pH & ORP
Controllers
www.hannainst.com
Dear Customer,
Thank you for choosing a Hanna Instruments® product.
Please read this instruction manual carefully before using the instrument.
This manual will provide you with the necessary information for correct
operations. If you need more technical information, do not hesitate to
e-mail us at tech@hannainst.com.
These instruments are in compliance with the
directives.
WARRANTY
All Hanna Instruments Office controllers are warranted for two years
against defects in workmanship and materials when used for their intended
purpose and maintained according to instructions. Electrodes and probes are
warranted for six months.
Damages due to accidents, misuse, tampering or lack of prescribed maintenance
are not covered. This warranty is limited to free of charge repair or replacement
of the meter only, if any malfunctioning is due to manufacturing defects.
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 problem. 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 shipment costs
prepaid. When shipping any instrument, make sure it is properly packaged
for complete protection.
TABLE OF CONTENTS
PRELIMINARY EXAMINATION..........................................................3
GENERAL DESCRIPTION..................................................................3
MECHANICAL LAYOUTS...................................................................4
HI9910 FUNCTIONAL DESCRIPTION & SPECIFICATIONS....................6
HI9911 FUNCTIONAL DESCRIPTION & SPECIFICATIONS....................8
HI9920 FUNCTIONAL DESCRIPTION & SPECIFICATIONS..................10
CONNECTIONS & WIRING.............................................................12
pH CALIBRATION ........................................................................16
ORP CALIBRATION ......................................................................18
SETPOINT ADJUSTMENT...............................................................19
TAKING MEASUREMENT...............................................................22
PROPORTIONAL CONTROL............................................................23
OVERDOSAGE TIMER....................................................................25
pH VALUES AT VARIOUS TEMPERATURES......................................25
REDOX MEASUREMENT (HI9920 only)..........................................26
SUGGESTED INSTALLATIONS FOR pH/ORP ELECTRODES.................28
ACCESSORIES..............................................................................29
2
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, please contact your local
Hanna Instruments Office.
Note: Save all packing materials until you are sure that the instrument
functions correctly. Any defective item must be returned in the
original packaging together with the supplied accessories.
Warning:
• Never install the controller outdoors, in a wet or humid area or
under direct sun light. Nor install the controller where liquids may
be sprayed or poured on it.
• The main power line of the instruments is protected by a 400 mA
fuse, while the dosage and alarm terminals are protected by separate
2 A fuses. Use only the specified fuses for replacement.
GENERAL DESCRIPTION
HI9910, HI9911 and HI9920 are wall-mounted pH and ORP regulators
designed to meet a variety of process control requirements.
The electrode can be installed by simply plugging it to the universal
BNC socket on the bottom of the meter.
These instruments also incorporate a triple contact alarm system for
triggering an external control, as a buzzer, light or any other electrical
device.
To avoid any interference, the recorder output terminals are isolated
from the controller circuitry, and 0-20 or 4-20 mA output can be
select by the user.
The housing is built for last with a rugged, modular, fiber-reinforced
ABS material.
Choose the controller which better meets your needs among HI9910
(single setpoint pH regulator), HI9911 (dual setpoint pH regulator) or
HI9920 (single setpoint ORP regulator).
Each model is available in three versions, according to different power
supply requirement: 115 Vac, 230 Vac or 100 Vac.
3
MECHANICAL LAYOUTS
Fig.1
Figure 1: BNC plug for electrode and wiring access ports.
Fig.2
Figure 2: Controls and terminals of the HI9910 pH controller.
Layouts vary according to model.
Fig.3
Figure 3: Dimensioned bottom view.
4
Fig.4
Figure 4: Dimensioned front view. The molded, mounting holes in
the four corners provide for quick and secure installation.
No additional hardware is needed for mounting. All electrical connections and controls are located on the front of the
instrument, so that any adjustment can be made without
needing to remove the unit.
5
HI9910 FUNCTIONAL DESCRIPTION
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
11.
12.
13.
14.
15.
16.
17.
18.
19.
20.
21.
Liquid Crystal Display
Slope calibration trimmer
Setpoint trimmer for Fine adjustment
Setpoint trimmer for Coarse adjustment
Offset calibration trimmer
Dosing LED
READ/SET switch for selecting normal measurement or setpoint
adjustment mode
Acid/Alkaline Dosage selection switch
Alarm LED and switch to disable the alarm
Manual Temperature Compensation knob
Overdosage timer knob
Proportional pH band and time cycle settings knobs
pH ∆Alarm setting trimmer (from 0.5 to 2.5 pH)
Short these terminals if no ground probe is used, or wire the
ground probe to the Matching Pin terminal
Pt100 probe terminals
Recorder output contacts
Automatic or Manual Temperature Compensation selection switch
0-20 mA or 4-20 mA isolated output selection switch
Triple contact alarm in a Normally Closed (NC) or a Normally
Open (NO) position (2 A fuse protected)
Powered dosage terminals (Relay, 2 A fuse protected)
Power supply terminals (400 mA fuse protected)
6
HI9910 SPECIFICATIONS
RANGE
0.00 to 14.00 pH
RESOLUTION
0.01 pH
ACCURACY
(@25 °C/77 °F)
±0.02 pH
TYPICAL EMC DEV.
±0.1 pH
mA OUTPUT
User-selectable, 0-20 mA or 4-20 mA
over the 0-14 pH range with isolated output
CALIBRATION
Through “OFFSET” and “SLOPE” trimmers
(Max. ±1.5 pH for offset and 80 to 110% for slope)
TEMPERATURE
COMPENSATION
Manual from -10 to 80 °C (14 to 176 °F) or
Automatic with a 3-wire Pt100 probe from 0 to 50 °C
(32 to 122 °F)
SETPOINT RANGE
From 0.00 to 14.00 pH with 2 trimmers: “COARSE”
for approx. regulation, “FINE” for fine tuning
PROPORTIONAL
CONTROL
pH is user adjustable from 0 to 2.0 and
time cycle from 0 to 90 seconds
ALARM CONTACT
Terminals can be configured as Normally Open or Normally Closed (isolated output Max. 2A/250Vac/30Vdc,
resistive load, 1.000.000 strokes). The alarm is activated
if pH varies by more than user-selectable interval (0.5 to
2.5 pH) from setpoint or due to overdosage
DOSING TERMINALS
Relay terminals (Max. 2A/250Vac/30Vdc, resistive load,
1.000.000 strokes) are activated whenever pH exceeds
the “ACID” setpoint (Acid dosage) or falls below the
“ALK” setpoint (Alkaline dosage)
ENVIRONMENT
-10 to 50 °C (14 to 122 °F);
RH 95% non-condensing
CASE MATERIAL
Fiber-reinforced, flame-retardant ABS
POWER SUPPLY
HI9910-1 : 115 Vac, 60 Hz
HI9910-2 : 230 Vac, 50 Hz
HI9910-3 : 100 Vac, 50/60 Hz
ENCLOSURE
181 x 221 x 142 mm (7.1 x 8.7 x 5.6”)
WEIGHT
1.6 kg (3.5 lb.)
Unplug the instrument from the power supply before
wiring or replacing the fuses.
7
HI9911 FUNCTIONAL DESCRIPTION
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
11.
12.
13.
14.
15.
16.
17.
18.
19.
20.
21.
Liquid Crystal Display
Slope calibration trimmer
Setpoint trimmers for acid and alkaline feed, Fine tuning
Setpoint trimmers for acid and alkaline feed, Coarse adjustment
Offset calibration trimmer
Dosing LED’s for acid and alkaline feed
READ/SET switch for selecting normal measurement or setpoint
adjustment mode
Acid/Alkaline setpoint selection switch
Alarm LED and switch to disable the alarm
Manual Temperature Compensation knob
Two independent overdosage timers knobs
Proportional pH band and time cycle settings knobs
pH ∆Alarm setting trimmer (from 0.5 to 2.5 pH)
Short these terminals if no ground probe is used, or wire the
ground probe to the Matching Pin terminal
Pt100 probe terminals
Recorder output contacts
Automatic or Manual Temperature Compensation selection switch
0-20 mA or 4-20 mA isolated output selection switch
Triple contact alarm in a Normally Closed (NC) or a Normally
Open (NO) position (2 A fuse protected)
Powered dosage terminals (Relay, 2 A fuse protected)
Power supply terminals (400 mA fuse protected)
8
HI9911 SPECIFICATIONS
RANGE
0.00 to 14.00 pH
RESOLUTION
0.01 pH
ACCURACY
(@25 °C/77 °F)
±0.02 pH
TYPICAL EMC DEV.
±0.1 pH
mA OUTPUT
User-selectable, 0-20 mA or 4-20 mA
over the 0-14 pH range with isolated output
CALIBRATION
Through “OFFSET” and “SLOPE” trimmers
(Max. ±1.5 pH for offset and 80 to 110% for slope)
TEMPERATURE
COMPENSATION
Manual from -10 to 80 °C (14 to 176 °F) or
Automatic with a 3-wire Pt100 probe from 0 to 50 °C
(32 to 122 °F)
SETPOINT RANGE
From 0.00 to 14.00 pH with 2 trimmers: “COARSE”
for approx. regulation, “FINE” for fine tuning
PROPORTIONAL
CONTROL
pH is user adjustable from 0 to 2.0 and
time cycle from 0 to 90 seconds
ALARM CONTACT
Terminals can be configured as Normally Open or Normally Closed (isolated output Max. 2A/250Vac/30Vdc,
resistive load, 1.000.000 strokes). The alarm is activated
if pH varies by more than user-selectable interval (0.5 to
2.5 pH) from setpoint or due to overdosage
DOSING TERMINALS
Two sets of independent relay terminals (Max.
2A/250Vac/30Vdc, resistive load, 1.000.000 strokes)
are activated whenever pH exceeds the “ACID” setpoint
(Acid dosage) or falls below the “ALK” setpoint (Alkaline
dosage)
ENVIRONMENT
-10 to 50 °C (14 to 122 °F);
RH 95% non-condensing
CASE MATERIAL
Fiber-reinforced, flame-retardant ABS
POWER SUPPLY
HI9911-1 : 115 Vac, 60 Hz
HI9911-2 : 230 Vac, 50 Hz
HI9911-3 : 100 Vac, 50/60 Hz
ENCLOSURE
181 x 221 x 142 mm (7.1 x 8.7 x 5.6”)
WEIGHT
1.6 kg (3.5 lb.)
Unplug the instrument from the power supply before
wiring or replacing the fuses.
9
HI9920 FUNCTIONAL DESCRIPTION
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
11.
12.
13.
14.
15.
16.
17.
Liquid Crystal Display
Setpoint trimmer for Fine adjustment
Setpoint trimmer for Coarse adjustment
Calibration trimmer
Dosing LED
READ/SET switch for selecting normal measurement or setpoint
adjustment mode
Oxidization/Reduction Dosage selection switch
Alarm LED and switch to disable the alarm
Overdosage timer knob
Proportional ORP band and time cycle settings knobs
ORP ∆Alarm setting trimmer (from 50 to 250 mV)
Short these terminals if no ground probe is used, or wire the
ground probe to the Matching Pin terminal
Recorder output contacts
0-20 mA or 4-20 mA isolated output selection switch
Triple contact alarm in a Normally Closed (NC) or a Normally
Open (NO) position (2 A fuse protected)
Powered dosage terminals (Relay, 2 A fuse protected)
Power supply terminals (400 mA fuse protected)
10
HI9920 SPECIFICATIONS
RANGE
-500 to 1500 mV
RESOLUTION
1 mV
ACCURACY
(@25 °C/77 °F)
±5 mV
TYPICAL EMC DEV.
±6 mV
mA OUTPUT
User-selectable, 0-20 mA or 4-20 mA
over the -500 to 1500 mV range with isolated output
CALIBRATION
Through “CAL” trimmer
SETPOINT RANGE
From -500 to 1500 mV with 2 trimmers:
“COARSE” for approx. regulation, “FINE” for fine tuning
PROPORTIONAL
CONTROL
ORP setting is user adjustable from 0 to 200 mV
and time cycle from 0 to 90 seconds
ALARM CONTACT
Terminals can be configured as Normally Open or Normally Closed (isolated output Max. 2A/250Vac/30Vdc,
resistive load, 1.000.000 strokes). The alarm is activated
if the ORP value varies by more than user-selectable interval (50 to 250 mV) from setpoint, or due to overdosage
DOSING TERMINALS
Relay terminals (Max. 2A/250Vac/30Vdc, resistive load,
1.000.000 strokes) are activated when mV exceeds
the setpoint (“RED” dosage) or falls below the setpoint
(“OXID” selection)
ENVIRONMENT
-10 to 50 °C (14 to 122 °F);
RH 95% non-condensing
CASE MATERIAL
Fiber-reinforced, flame-retardant ABS
POWER SUPPLY
HI9920-1 : 115 Vac, 60 Hz
HI9920-2 : 230 Vac, 50 Hz
HI9920-3 : 100 Vac, 50/60 Hz
ENCLOSURE
181 x 221 x 142 mm (7.1 x 8.7 x 5.6”)
WEIGHT
1.6 kg (3.5 lb.)
Unplug the instrument from the power supply before
wiring or replacing the fuses.
11
CONNECTIONS & WIRING
• Unscrew the 4 screws on the right hand panel and remove the cover
and the gasket. Thread the wires through the access ports on the
right hand side of the controller.
• Wire the controller completely, connect all the external devices
(pumps, alarm, electrode, etc.), set the alarm threshold and adjust
the settings.
• Replace the cover, then connect the controller to the mains.
ELECTRODE CONNECTION
• Simply plug any combination pH or ORP electrode (such as
HI1002/3 or HI2002/3) to the BNC socket on the bottom of the
casing and twist it into a secure position.
• All models are provided with the differential input
feature to reduce electrical noise and interference,
and come with the Matching Pin and Reference
terminals shorted.
If using no matching pin (ground probe), leave the terminals
shorted.
• If using a probe for grounding
purposes, wire it to the Matching
Pin terminal on the right hand
panel and remove the jumper.
RELAY CONNECTIONS
• Wire the external device(s), as pump or electrovalve, directly to
the relay terminal strip (one for HI9910 and HI9920, and two
for HI9911) of the controller. The terminals are powered and no
external power supply for pump or electrovalve is needed.
12
ALARM CONNECTIONS
• The alarm threshold is user-selectable from
0.5 to 2.5 pH for HI9910 and HI9911, or
from 50 to 250 mV for HI9920, by turning
the alarm trimmer with a small screwdriver.
If the actual measurement is above or below the setpoint by a
value greater than the selected threshold, the alarm terminal is
activated. The alarm can be configured as Normally Closed (“NC”)
by connecting the external device to the COM and NC terminals or
Normally Open (“NO”) by connecting the external device to the
COM and NO terminals.
• When the alarm is activated, the alarm LED turns on and the alarm
contacts will open or close, triggering the external connected device.
When the alarm is activated all the other terminals (such as dosing
relays) are disactivated.
• The alarm ON/OFF switch can only disable the
alarm terminal (e.g. the buzzer stops sound),
while all the other functions, such as disactivation of the dosing relays, are not affected.
• The controllers provide for automatic fail-safe security by activating
the alarm if there is a power failure, regardless of whether the NC
or NO configurations were chosen.
• The alarm is also activated if the maximum
dosage time is exceeded. The overdosage timer
can be set from 1 to 10 minutes.
For HI9911, two timers can be independently
selected for acid and alkaline corrections.
• Once an alarm condition occurs, the alarm contact remains activated
until the switch is manually put in the off position or the measurement returns to normal values.
13
• The alarm is activated for readings varying as follow:
HI9910: 0.5 to 2.5 pH (user-selectable) above or below the setpoint;
HI9911: 0.5 to 2.5 pH (user-selectable) lower than the ALKALINE
setpoint or higher than the ACID setpoint;
HI9920: 50 to 250 mV (user-selectable) above or below the setpoint.
RECORDER OUTPUT CONNECTIONS
• The recorder output contacts are isolated from the controller circuitry
to avoid interference.
Before wiring, select the desired output
(0-20 or 4-20 mA) with the selector
switch.
The mA output value corresponds to the pH or ORP value over the
whole measurement range. For example, when measuring pH 7, the
output value is 10 or 12 mA depending from the selected output
interval (0-20 or 4-20 mA respectively).
TEMPERATURE COMPENSATION (HI9910 & HI9911 only)
• Manual Temperature Compensation: move the selector switch
to the MTC position, then manually set the temperature by turning
the MTC knob to the correct working temperature.
• Automatic Temperature Compensation: move the selector switch
to the ATC position, then wire a Pt100 probe, such as HI7610 to
the proper terminals as indicated.
14
HI7610 is a probe with stainless steel body and 5 m cable.
For solutions not compatible with stainless steel, use the HI7620 glassbody probe, or another appropriate 3-wire Pt100 probe.
MAIN POWER SUPPLY CONNECTION
• For each model (HI9910, HI9911, HI9920) three versions are
available, according to different power supply requirement:
version -1 works at 115 Vac; 60 Hz
version -2 works at 230 Vac; 50 Hz
version -3 works at 100 Vac; 50/60 Hz
• Before connecting the unit to the mains, make sure that the
controller is completely wired and that all the external devices (as
pump, alarm, electrode, etc.) have been connected.
• Wire the external power supply to the three
terminals as indicated; reattach the cover
making sure the gasket is in place, and
tight the 4 screws.
• Only then connect the controller to the mains.
15
pH CALIBRATION (HI9910 and HI9911)
Properly connect the pH electrode and wire the separate ground probe
(if used) to the controller, then plug the meter to the mains.
It is recommended to perform calibration at a temperature similar to
that of the sample to be monitored.
Use a Checktemp (or another accurate thermometer) as reference for temperature.
Remove the electrode protective cap.
During calibration, move the electrode and the
separate ground probe (if in use) together from
one buffer to the next.
If no separate ground probe is used, make sure
that the Reference and the Matching Pin terminals
are shorted.
If the pH electrode incorporates a ground probe/matching pin
(as for example HI1003/3), remove the jumper.
Set the SET/READ switch to “READ” position.
OFFSET ADJUSTMENT:
• Rinse the electrode (and ground probe) with
pH7.01 solution (HI7007), then immerse the
tip(s) in pH7.01 buffer. An immersion level
of about 4 cm (1.5”) is recommended.
• Place the Checktemp thermometer in the buffer solution. Adjust
the knob to show the same temperature as that measured by the
Checktemp and make sure the selector switch is in the MTC position.
16
• Wait for the reading to stabilize and
then adjust the “OFFSET” trimmer
to display the buffer pH value at the
measured temperature, e.g. pH7.01
if the temperature is 25 °C (77 °F).
• Refer to the table at page 25 for the appropriate buffer value at a
given temperature, and adjust the trimmer accordingly.
SLOPE ADJUSTMENT:
• Rinse the electrode (and ground probe)
thoroughly with water and immerse the
tip(s) in pH4.01 (HI7004) or pH10.01
(HI7010) buffer solution. An immersion
level of about 4 cm (1.5”) is recommended.
Note: Use pH4.01 if monitoring acidic solutions; use pH10.01 for
alkaline samples.
• Stir the electrode and wait for the display to stabilize before
adjusting the “SLOPE” trimmer to display the buffer pH value
at the measured temperature, e.g. pH4.01 (or pH10.01) if the
temperature is 25 °C (77 °F).
• Refer to the table at page 25 for the appropriate buffer value at a
given temperature, and adjust the trimmer accordingly.
The pH calibration is now complete.
17
ORP CALIBRATION (HI9920)
Properly connect the ORP electrode and wire the separate ground probe
(if used) to the controller, then plug the meter to the mains.
Remove the electrode protective cap.
Immerse the electrode and the ground probe (if
in use) in the reference solution. An immersion
level of about 4 cm (1.5”) is recommended.
If no separate ground probe is used, make
sure that the Reference and the Matching Pin
terminals are shorted.
If the ORP electrode incorporates a ground probe/matching pin
(as for example HI2003/3), remove the jumper.
Set the SET/READ switch to “READ” position.
Immerse the electrode in a solution of known
ORP (mV) value and wait for a few minutes for
the reading to stabilize.
Adjust the CAL trimmer to display the
known value, for example 230 mV.
18
SETPOINT ADJUSTMENT
The electrode and the ground probe (if in use) have to be properly
installed and calibration performed.
FOR HI9910
Set the SET/READ switch to “SET” position; the display shows the previously set
value (e.g. pH8.00).
Using a small screwdriver, first adjust the value through the COARSE
trimmer and then tune it through the FINE trimmer until the desired
setpoint value is displayed (e.g. pH6.00).
DOSING SELECTION
Select the desired dosing, acid or alkaline, through
the ALK/ACID switch.
To dose acidic substances/solutions and lower the
pH value, set the selector switch to “ACID”; to dose
bases or alkaline solutions and increase the pH value,
select “ALK”.
Dosing acidic solution, example
Setpoint = pH6.00
Measured value = pH7.00
To reach the setpoint value it is necessary to dose acid: move the switch
to “ACID” position.
Dosing alkaline solution, example
Setpoint = pH6.00
Measured value = pH4.00
To reach the setpoint value it is necessary to dose base: move the
switch to “ALK” position.
19
FOR HI9911 (DUAL-POINT ADJUSTMENT)
a) ACID SETPOINT and DOSAGE
To set the upper limit and direct the controller to lower the pH value,
set the SET/READ switch to “SET” and the ALK/ACID switch to “ACID”;
the display shows the higher setpoint (e.g. pH7.00).
Using a small screwdriver, adjust the two “ACID SET” trimmers. First
adjust the “COARSE” trimmer and then tune through the “FINE” trimmer
until the desired setpoint value is displayed (e.g. pH8.00).
b) ALKALINE SETPOINT and DOSAGE
To set the lower limit and direct the controller to increase the pH value,
set the SET/READ switch to “SET” and the ALK/ACID switch to “ALK”;
the display shows the lower setpoint (e.g. pH6.00).
Using a small screwdriver, adjust the two “ALKALINE SET” trimmers.
First adjust the “COARSE” trimmer and then tune through the “FINE”
trimmer until the desired setpoint value is displayed (e.g. pH5.00).
20
Notes:
• The “FINE” trimmer can adjust up to ±1.5 pH.
• If the HI9911 is used for a single-point dosage, it is recommended
to operate as follows:
if dosing acid solution, adjust the “ALKALINE SET” trimmers to 0.00
pH and set the “ACID SET” trimmers to the desired value;
if dosing alkaline solution, adjust the “ACID SET” trimmers to 14.00
pH and set the “ALKALINE SET” trimmers to the desired value.
FOR HI9920
Set the SET/READ switch to “SET” position; the display shows the
previously set value (e.g. mV650).
Using a small screwdriver, first adjust the value through the COARSE
trimmer and then tune it through the FINE trimmer until the desired
setpoint value is displayed (e.g. mV700).
DOSING SELECTION
Select the desired dosing, reductant or oxidant, through
the OXID/RED switch.
For reducing dosage and lowering the mV value, set
the selector switch to “RED”; for oxidizing dosage and
increasing the mV value, select “OXID”.
Dosing reducing substances, example
Setpoint = mV650
Measured value = mV700
Move the switch to “RED” position.
Dosing oxidizing substances, example
Setpoint = mV650
Measured value = mV500
Move the switch to “OXID” position.
21
TAKING MEASUREMENTS
Before taking any measurements, make sure that the controller has been
calibrated, and that alarm threshold and setpoint values have been set.
Connect the electrode and wire the ground probe (if used) to the
controller.
Remove the electrode protective cap.
Ensure that the electrode is properly installed and permanently immersed in the solution of at least 4 cm (1.5”).
Check that the SET/READ selector switch is set to “READ” position.
If using a temperature probe for compensate
readings (HI9910 and HI9911), make sure
that this probe is also immersed in the solution and that the MTC/ATC selector switch is
set to “ATC”.
For manual temperature compensation, the
selector switch has to be on “MTC” position
and the knob adjusted to the temperature of the solution.
The actual pH (or ORP) value of the solution is displayed on the LCD.
All controllers visualize the dosing status
through a LED. In HI9910 and HI9920
models the DOSING LED lights up when the
controller is in pH or ORP dosage mode and
the terminals are activated.
In HI9911 two LED’s visualize the dosing
status: one refers to ACID and one to ALK
(alkaline) dosage, and light up according to
the activated terminals.
22
PROPORTIONAL CONTROL
In order to optimize the controlling
process and reduce the amount of
chemicals used, it is recommended
to set an appropriate proportional
dosage.
All models allow to set a proportional band (“Delta” = 0 to 2.0 pH
or 0 to 200 mV) as well as a time cycle (from 0 to 90 seconds). The
proportional dosage is obtained by personalizing the duty cycle and
frequency of the dosing relay activation/deactivation cycle.
The controller will enter proportional dosage at setpoint. Then it will
keep the dosing relay activated for a period proportional to the difference
between the measurement and the setpoint over the cycle. When the
measurement reaches the setpoint ± (depending on control direction)
the selected “Delta”, the dosing relay is always on.
pH proportional control, example
Setpoint = 5.00 pH
Reading = 6.50 pH
Reading - Setpoint = 1.5 pH
Proportional settings: pH set to 2 and time cycle to 60 seconds.
The controller doses acidic solution to lower the pH value to the
desired limit.
Since it is 1.50/2.00 = 75% away from the ideal setting, it will
keep activated the dosing
terminals for 75% of the
time over the predetermined
60 seconds. The relay is
hence theoretically activated
for 45 seconds and off for
15 seconds.
The controller prevent over
dosage with fast responding
samples or highly concentrated chemicals, or under
dosage with slow reacting
or weak chemicals, stopping the dosage as soon as the difference
between the reading and the setpoint intersects the proportional line,
as shown in the graphs.
23
This means shortening the dosage time if the chemicals have reacted
quickly or lengthening it if the
measured pH continues to drift
from the ideal setpoint as can
be seen from the graphs.
ORP proportional control, example
Setpoint = 725 mV
Reading = 700 mV
Setpoint - Reading = 25 mV
Proportional settings = mV set to 100 and time cycle to 60 seconds.
The controller will dose reductants to lower the ORP value to the desired value. Since it is 25/100 = 25% away from the ideal setting,
it will keep activated the
dosing relay for 25% of the
time over the predetermined
60 seconds.
The terminals are hence
activated for 15 seconds and
off for 45 seconds until the
next cycle.
Notes:
• If the setting is left at 0 pH or 0 mV, the controller will operate
with no proportional dosage, with an hysteresis of approximately
0.1 pH or 7 mV.
• Do not set the time cycle to zero. This will cause the relay to chatter
and can be detrimental to system and pumps.
24
OVERDOSAGE TIMER
All models provide for an overdosage alarm system
ranging from 1 to 10 minutes. The maximum time
interval for the dosing terminals continuously activated
is user-selectable through a knob on the front panel.
If this period elapses, the alarm terminals are activated and dosage
disactivated, to ensure that chemicals do not run out, or pumps or
electrovalves do not cease to function properly.
The HI9911 model provides for two independent
time controls, one for acid dosage and one for
alkaline.
pH VALUES AT VARIOUS TEMPERATURES
Please refer to the below table for a more accurate pH calibration:
TEMP
pH VALUES
°C
°F
4.01
6.86
7.01
9.18
10.01
0
32
4.01
6.98
7.13
9.46
10.32
5
41
4.00
6.95
7.10
9.39
10.24
10
50
4.00
6.92
7.07
9.33
10.18
15
59
4.00
6.90
7.04
9.27
10.12
20
68
4.00
6.88
7.03
9.22
10.06
25
77
4.01
6.86
7.01
9.18
10.01
30
86
4.02
6.85
7.00
9.14
9.96
35
95
4.03
6.84
6.99
9.10
9.92
40
104
4.04
6.84
6.98
9.07
9.88
45
113
4.05
6.83
6.98
9.04
9.85
50
122
4.06
6.83
6.98
9.01
9.82
55
131
4.07
6.84
6.98
8.99
9.79
60
140
4.09
6.84
6.98
8.97
9.77
65
149
4.11
6.85
6.99
8.95
9.76
70
158
4.12
6.85
6.99
8.93
9.75
Examples: if the buffer temperature is 25 °C (77 °F), calibrate the meter
to read 4.01, 7.01 or 10.01 on the display; if the temperature is 20 °C,
calibrate to 4.00, 7.03 or 10.06; if the temperature is 50 °C, calibrate to
4.06, 6.98 or 9.82.
25
REDOX MEASUREMENT (HI9920 only)
Redox measurements allow the quantification of the oxidizing or
reducing power of a solution, and are commonly expressed in mV.
Oxidation may be defined as the process during which a molecule (or
an ion) loses electrons and reduction as the process by which electrons
are gained.
Oxidation is always coupled together with reduction so that as one
element gets oxidized, the other is automatically reduced, therefore
the term oxidation-reduction is frequently used.
Redox potentials are measured by an electrode capable of absorbing
or releasing electrons without causing a chemical reaction with the
elements with which it comes into contact.
The electrodes most usually available for this purpose have gold or
platinum surfaces; gold possesses a higher resistance than platinum
in conditions of strong oxidation such as cyanide, while platinum is
preferred for the measurements of oxidizing solutions containing halides
and for general use.
When a platinum electrode is immersed in an oxidizing solution a
monomolecular layer of oxygen is developed on its surface. This layer
does not prevent the electrode from functioning, but it increases the
response time. The opposite effect is obtained when the platinum
surface absorbs hydrogen in the presence of reducing mediums. This
phenomenon is rough on the electrode.
To make accurate redox measurements the surface of the electrode must
be clean and smooth. At certain mV and pH values, the ORP electrode
requires a considerable amount of time before it reads the proper value.
This is at times due to the fact that it is moving from a reducing to
an oxidizing state. Once it reaches a stable condition though, it reacts
rapidly to changes.
Hence when the process is first set up allow sufficient time for the ORP
electrode to adapt itself to the sample stream.
As with pH electrodes, gel-filled redox electrodes are more suitable for
industrial applications due to less maintenance requirements.
In the event that measurements are made in solutions containing heavy
doses of sulfide or protein, the diaphragm of the reference electrode
must be cleaned more often.
In order to test if the ORP electrode is functioning properly, immerse
it into a HI7021 solution. The measured value should be between
240 ±20 mV.
26
When not in use, the electrode tip and the reference junction should
be kept moist: put a few drops of HI70300 storage solution in the
protective cap should before storing the electrode.
If the electrode has been left dry, soak it overnight in a HI70300
storage solution before using it, or allow more time upon installation
for its stabilization.
Keep the electrode far from any mechanical stress which might cause
damages.
Install the electrode in such a way that it is constantly immersed in the
sample under control (stream or tank) and does not dry up.
Note: For industrial applications, it is always good practice to keep
at least one spare electrode handy. When anomalies are not
resolved with a simple maintenance, replace the electrode to
see if the problem is alleviated.
27
SUGGESTED INSTALLATIONS
for pH/ORP ELECTRODES
The electrode should be installed in such a way that its tip permanently
lies in the solution to be monitored.
SHORT DISTANCE, INDOOR INSTALLATION
Due to the low currents involved, a very high grade of insulation is
required and a dry environment is needed in order to obtain a level of
insulation not lower than 1012 Ω.
This type of connection is very delicate and requires constant attention
to maintain proper operating conditions.
Conventional electrodes may be used for indoor applications but the
cable length should not exceed 10 m (33').
MEDIUM DISTANCE, INDOOR/OUTDOOR INSTALLATION
When an outdoor installation is required, it is normally necessary to
install a transmitter to obtain accurate readings at distances from
10 to 50 m (33-165’).
Since the introduction of AmpHel® electrodes these distances are no
longer a problem: connect the meter directly to an AmpHel electrode,
saving the cost of a transmitter.
The standard cable length of the AmpHel® electrodes is 5 m (16.5’).
Additional lengths of regular cable, up to 50 m (165’), can be installed
without special connectors.
It is recommended to use coaxial cables, which provide excellent
insulation, even though AmpHel® electrodes can operate with both.
AmpHel electrodes have a built-in micro-amplifier in the electrode cap
to boost the signal, drastically reducing susceptibility to noise and drift.
For more details about these or other specially made electrodes, consult
the Hanna Instruments Office process and water treatment literature, or
contact the nearest Hanna Instruments Office Service Center.
28
ACCESSORIES
pH ELECTRODES
PTFE double-junction electrode with external threads
PTFE double-junction electrode with external threads and
matching pin
HI2911B/5 Amplified electrode with PTFE double-junction and BNC
connector
HI1002/3
HI1003/3
ORP (Pt) ELECTRODES
PTFE double-junction electrode with external threads
PTFE double-junction electrode with external threads and
matching pin
HI2931B/5 Amplified electrode with PTFE double-junction and BNC
connector
HI2002/3
HI2003/3
ORP (Au) ELECTRODES
HI2012/3
HI2013/3
PTFE double-junction electrode with external threads
PTFE double-junction electrode with external threads and
matching pin
Hanna Instruments® manufacturers hundreds of pH and ORP electrodes
for a wide variety of process and water treatment applications. For a
complete list, consult our web site at www.hannainst.com or contact
your local Hanna Instruments Office.
pH CALIBRATION SOLUTIONS
HI7004L
HI7007L
HI7010L
pH4.01 buffer solution, 500 mL bottle
pH7.01 buffer solution, 500 mL bottle
pH10.01 buffer solution, 500 mL bottle
ORP SOLUTIONS
HI7021L
HI7092L
Test solution 240 mV, 500 mL bottle
Pretreatment oxidizing solution, 500 mL bottle
MAINTENANCE SOLUTIONS
HI70300L
HI7061L
HI7073L
Storage solution, 500 mL bottle
General purpose cleaning solution, 500 mL bottle
Protein cleaning solution, 500 mL bottle
29
OTHER ACCESSORIES
BL PUMPS
ChecktempC
ChecktempF
HI6050
HI6051
HI6054B
HI7610
HI7620
HI8427
HI931001
Dosing pumps (several models are available, with flow
rates from 1.5 to 18.3 lph / 0.4 to 4.8 gph)
Pocket-size thermometer (-50.0 to 150.0 °C)
Pocket-size thermometer (-58.0 to 302.0 °F)
Submersible electrode holder (605 mm/23.8” total
length)
Submersible electrode holder (1105 mm/43.5” total
length)
Electrode holder for in-line applications
Stainless steel Pt100 probe with 5 m cable
Glass body Pt100 probe with 5 m cable
pH and ORP Electrode Simulator and high impedance
tester with 1 m (3.3’) Coaxial Cable ending with a
male BNC connector (HI7858/1)
pH and ORP Electrode Simulator with display and 1 m
(3.3’) Coaxial Cable ending with a male BNC connector
(HI7858/1)
All rights are reserved. Reproduction in whole or in part is prohibited
without the written consent of the copyright owner.
30
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 unacceptable interference to radio and TV equipment.
The glass bulb at the end of the pH electrode is sensitive to electrostatic
discharges. Avoid touching this glass bulb at all times. During operation, ESD wrist straps should be worn to avoid possible damage to the
electrode by electrostatic discharges.
Any variation introduced by the user to the supplied equipment may
degrade the instrument’s EMC performance.
To avoid electrical shock, do not use this instrument when voltages at
the measurement surface exceed 24 Vac or 60 Vdc.
To avoid damages or burns, do not perform any measurement in
microwave ovens.
Unplug the instruments from power supply before replacing the fuse or
making any electrical connections.
Hanna Instruments reserves the right to modify the design, construction and appearance of its products without advance notice.
31
SALES AND TECHNICAL SERVICE CONTACTS
Australia:
Tel. (03) 9769.0666 • Fax (03) 9769.0699
China:
Tel. (10) 88570068 • Fax (10) 88570060
Egypt:
Tel. & Fax (02) 2758.683
Germany:
Tel. (07851) 9129-0 • Fax (07851) 9129-99
Greece:
Tel. (210) 823.5192 • Fax (210) 884.0210
Indonesia:
Tel. (21) 4584.2941 • Fax (21) 4584.2942
Japan:
Tel. (03) 3258.9565 • Fax (03) 3258.9567
Korea:
Tel. (02) 2278.5147 • Fax (02) 2264.1729
Malaysia:
Tel. (603) 5638.9940 • Fax (603) 5638.9829
Singapore:
Tel. 6296.7118 • Fax 6291.6906
South Africa:
Tel. (011) 615.6076 • Fax (011) 615.8582
Taiwan:
Tel. 886.2.2739.3014 • Fax 886.2.2739.2983
United Kingdom:
Tel. (01525) 850.855 • Fax (01525) 853.668
USA:
Tel. (401) 765.7500 • Fax (401) 765.7575
For e-mail contacts and complete list of Sales and
Technical offices, please see www.hannainst.com
MAN9910-20 10/17
Thailand:
Tel. (66) 2619.0708 • Fax (66) 2619.0061
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