Hanna Instruments BL 7916 User manual

Instruction Manual
BL 7916 - BL 7917
pH and ORP
Controller &
Dosing Pump
http://www.hannacan.com TheseInstrumentsarein
Compliancewith theCE Directives

ISO 9000 Certified
Company since 1992
DearCustomer,
Thank you for choosing a Hanna product.
Please read this instruction manual carefully before using the pump.
This manual will provide you with the necessary information for a
correct use of the pump, as well as a precise idea of its versatility. If
you need additional technical information, do not hesitate to e-mail
us at [email protected].
These instruments are in compliance with the directives
EN50081-1 and EN 50082-1.
TABLE OF CONTENTSTABLE OF CONTENTS
TABLE OF CONTENTSTABLE OF CONTENTS
TABLE OF CONTENTS
PRELIMINARY EXAMINATION........................................................3
GENERAL DESCRIPTION ................................................................4
FLOW RATE CHART.......................................................................5
FUNCTIONAL DESCRIPTION BL 7916 ............................................6
FUNCTIONAL DESCRIPTION BL 7917 ............................................7
SPECIFICATIONS...........................................................................8
VALVE / HOSE ASSEMBLY DIAGRAM.............................................9
MECHANICAL DIMENSIONS ........................................................10
INSTALLATION...........................................................................11
OPERATIONAL GUIDE .................................................................18
pH CALIBRATION.......................................................................22
TROUBLESHOOTING GUIDE ........................................................23
MAINTENANCE ........................................................................... 24
ELECTRODE CONDITIONING AND MAINTENANCE...........................26
TAKING REDOX MEASUREMENTS.................................................30
CHEMICAL COMPATIBILITY GUIDE................................................32
ACCESSORIES.............................................................................34
WARRANTY ................................................................................ 41
OTHER PRODUCTS FROM HANNA...............................................42
CE DECLARATION OF CONFORMITY..............................................43

3
PRELIMINARY EXAMINATIONPRELIMINARY EXAMINATION
PRELIMINARY EXAMINATIONPRELIMINARY EXAMINATION
PRELIMINARY EXAMINATION
Remove the pump 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.
Each pump is supplied complete with:
• 7 m (23') LPDE suction and discharge tubing
• Powercord
• Instruction manual
Note: Save all packing material until you are sure that the pump
functions correctly. Any defective item must be returned in the
original packaging together with the supplied accessories.
READTHEINSTRUCTIONSATTENTIVELY
BEFORE INSTALLING OR OPERATING YOUR PUMP
The BL electronic dosing pumps are easy to use. We recommend,
however, that you read the entire manual before using the pump.
Familiarity with the features and controls of the unit will give you a
better idea of the dosing potential and help reduce operator errors.
Please operate the pump only as directed in the instruction manual.
Follow all general safety guidelines during operation.
Remember:electricaldevices are potentiallyhazardous.Checkthatthe
voltage of the installation matches the voltage indicated on the
specification label on the back of the pump.
Note: It is the responsibility of the user to install and ground the
pump properly; it is highly recommended to install an external
switch.
Each pump is protected by a 250V fuse that is located together with
1 spare in a drawer on the power socket under the pump.
Always store chemicals in safe, out of reach places. Follow the
directionsforusewith eachchemical.Donotassumechemicalsarethe
same because they look alike. Hanna Instruments cannot be held
responsible for the misuse of chemicals or the pump.
Always wear protective clothing (gloves and safety glasses) when
working near chemical dosing pumps. When pumping chemicals,
make sure all tubes are securely attached to the fittings. It is
recommended that tubing is shielded to prevent possible injury in
case of rupture or accidental damage.
Avoid using a pipe wrench or pliers on plastic parts and connectors.
These are best tightened with an open end or crescent wrench. Avoid

4
overtightening these parts as this could cause damage to the seats
and threads.
If a hose is used, it should be securely fastened to columns, walls,
braces, etc. This will ensure that the hose connection will remain tight
and leak free. Shield the hose from direct sunlight. Sunlight can
cause an autocatalytic reaction with some chemicals and weaken the
hosewalls.
The arrow on the pump head indicates the direction of chemical flow
and should always point upwards (vertically). Never position the
pump horizontally with suction and discharge valves horizontal.
Locate the pump in an area out of the reach of children and pets.
All pumps undergo stringent tests to ensure that they comply with
their stated specifications and are calibrated at the maximum rated
pressure.
GENERAL DESCRIPTIONGENERAL DESCRIPTION
GENERAL DESCRIPTIONGENERAL DESCRIPTION
GENERAL DESCRIPTION
The BL 7916 and BL 7917 Control/Pump System offer respectively a
pH and ORP monitoring system with proportional control of a
diaphragm pump and an LCD readout.
Features include:
• Two advanced instruments in one compact unit
• Proportional control for precisely maintained set-points
• Rugged construction with a one-piece casing and a transpar-
ent cover to protect controls and terminals
• Chemically resistant non-clogging pump head and superior
materials for all components in contact with the chemicals
being dosed (see page 32 for details)
• Convenient installation with all controls on front panel
• A solenoid-driven pump
• Automatic overheat protection and a built-in LCD display
• Alarm output: the alarm of the BL 7916 will be activated if
the measured pH value is 2 pH units higher or lower than the
setpoint. BL7917's alarm will activate if the mV value is
200mV higher or lower than the setpoint.
• Auxiliary dosing contacts. This will drive other equipment such
as mixers, priming pumps, etc.
Unplug the instrument from the power supply before
replacing the fuse or making any electrical connections.

5
FLOW RATE CHARTFLOW RATE CHART
FLOW RATE CHARTFLOW RATE CHART
FLOW RATE CHART
The following chart shows the inverse relationship between flow rate
and pressure.
The table below shows typical reduction of the flow rate with an
increase of pressure. The pump supplied with the system has a
capacity of 13.3LPH (3.5 GPH) at 0.5 BAR (7.4 PSI).
BL 7916 / BL 7917
FLOW/PRESSURE
BAR(PSI) LPH (GPH)
0.5(7.4)
1.0(14.7)
2.0(29.4)
3.0(44.1)
4.0(58.8)
13.3(3.46)
11.7(3.04)
10.1(2.63)
9.0(2.33)
7.8(2.03)

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FUNCTIONAL DESCRIPTION BL 7916FUNCTIONAL DESCRIPTION BL 7916
FUNCTIONAL DESCRIPTION BL 7916FUNCTIONAL DESCRIPTION BL 7916
FUNCTIONAL DESCRIPTION BL 7916
1. Discharge Valve Assembly
2. Pump head
3. Suction Valve Assembly
4. Hose
5. Liquid Crystal Display
6. Offset Calibration Trimmer
7. Setpoint Adjustment Trimmers (FINE and COARSE)
8. Slope Calibration Trimmer
9. Acid/Base Selection Switch
10. Display Mode Selection Switch (SET or MEASURE)
11. TerminalConnections
12. BNC Connector for pH electrode
13. Overheating LED
14. Power Socket and Fuse Holder
15. Cable Glands
Unplug the instrument from the power supply before
replacing the fuse or making any electrical connections.

7
FUNCTIONAL DESCRIPTION BL 7917FUNCTIONAL DESCRIPTION BL 7917
FUNCTIONAL DESCRIPTION BL 7917FUNCTIONAL DESCRIPTION BL 7917
FUNCTIONAL DESCRIPTION BL 7917
Unplug the instrument from the power supply before
replacing the fuse or making any electrical connections.
1. Discharge Valve Assembly
2. Pump head
3. Suction Valve Assembly
4. Hose
5. Liquid Crystal Display
6. Setpoint Adjustment Trimmers (FINE and COARSE)
7. Reduction/Oxidation Selection Switch
8. Operating Mode Selection Switch (SET or MEASURE)
9. TerminalConnections
10. BNC Connector for ORP electrode
11. Overheating LED
12. Power Socket and Fuse Holder
13. Cable Glands

8
Range -999to+999mV
Resolution 1mV
Accuracy(@20°C/68°F) ±5mV
TypicalEMCDeviation ±6mV
Input High Impedance 10¹² Ohm
Dosage Proportional:oxidizing or reducing. User selectable
DosingContact Isolated,2A,Max.240V,resistiveload,1,000,000strokes
AlarmContact Isolated,2A,Max.240V,resistiveload,1,000,000strokes
RecorderOutput 4 to 20mA
PowerSupply 230V±15% 115V±15%
50/60Hz(40W) 50/60Hz(40W)
Environment 0to50°C(32to122°F);
max85%RHnon-condensing
Dimensions W x D x H: 221 x 142 x 181 mm (8.7 x 5.6 x 7.1)
Weight Approximately 5 Kg (11 lb.)
Range 0.00to14.00pH
Resolution 0.01pH
Accuracy (@20°C/68°F) ±0.01pH
TypicalEMCDeviation ±0.1 pH
Input High Impedance 10¹² Ohm
Dosage Proportional: acid or basic. User selectable
DosingContact Isolated,2A,Max.240V,resistiveload,1,000,000strokes
AlarmContact Isolated,2A,Max. 240V, resistiveload,1,000,000 strokes
Calibration Offset: ±1 pH by offset trimmer
Slope: 85 to 115% by slope trimmer
RecorderOutput 4to20mA
PowerSupply 230V±15% 115V±15%
50/60Hz (40W) 50/60Hz (40W)
Environment 0 to 50°C (32 to 122°F);
max 85% RH non-condensing
Dimensions WxDxH:221x142x181mm(8.7x5.6x7.1)
Weight Approximately 5 Kg (11 lb.)
BL7916D BL7916U
SPECIFICATIONSSPECIFICATIONS
SPECIFICATIONSSPECIFICATIONS
SPECIFICATIONS
BL7917D BL7917U

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VALVE / HOSE ASSEMBLY DIAGRAMVALVE / HOSE ASSEMBLY DIAGRAM
VALVE / HOSE ASSEMBLY DIAGRAMVALVE / HOSE ASSEMBLY DIAGRAM
VALVE / HOSE ASSEMBLY DIAGRAM
NECK

10
MECHANICAL DIMENSIONSMECHANICAL DIMENSIONS
MECHANICAL DIMENSIONSMECHANICAL DIMENSIONS
MECHANICAL DIMENSIONS
The Controller/Pump series of instruments are enclosed in a modular
housing for maximum protection. The dimensioned illustrations show
the layout of the Controller/Pumps and how they utilize the one-piece
polypropylene, injection-molded housing. Since there are no joints or
screws holding different sections of the housing together, the case is
extremely rugged and sturdy.
BOTTOM VIEW
FRONTVIEW
99mm
3.90"
110mm
4.33"
142mm
5.60"
5mm
0.19"
129mm
5.08"
17mm
.67"
55mm
2.16"
181mm
7.13"
110mm
4.33"
204mm
8.03"
164mm
6.45"
221mm
8.70"
pH

11
INSTALLATIONINSTALLATION
INSTALLATIONINSTALLATION
INSTALLATION
Materials Needed
• LDPEhose (7meter/22feet)(included)or othertypeof tubing
(Teflon®for example) more suitable for a specific application
(optional)
• Power cord (included)
Optional Accessories
• 4 each, ceramic weights (HI721008)
• 1 each, foot valve assembly (HI721005)
• 1 each, injection valve assembly (HI721004)
Location
A suitable location should:
• be near to a power source
• be conveniently close to the injection point
• allow easy access to the flow rate control and pipe or hose
connections
• be no more than 1.5 meters (5 feet) above the operating
position of the suction valve assembly.
Dimensions for Installation
BlackStone Pumps are designed for permanent installation.
The pump can be mounted directly on a wall or tank (see page 10 for
thespecific mountingdimensions).
Power Requirements
BlackStone pumps are designed to operate to specifications within the
following voltage ranges:
100 - 130 Volts for 115V models
200 - 250 Volts for 230V models
Teflon®is a registered Trademark of "du Pont de Nemours & Co."

12
To ensure maximum performance, check the voltage at the point of
supplytoverifythatitissufficient.Itisrecommendedthatyou installa
1 Amp circuit breaker between the pump and the power supply. This
will give additional protection to the internal circuit and provide a
convenient way to disconnect the power supply prior to servicing the
pump,ifneeded.
Injection Point
• Chooseaninjectionpoint thatallowsyoutomounttheinjection
valveassemblyvertically.
• The spring in the injection valve assembly (HI721004) adds
approximately 1.5 bar of back pressure. If pumping into a
high back pressure, the spring should be removed.
Other Considerations
• If you are mounting the system to a wall, column, etc., be sure
it is strong enough to support the weight of the entire system.
• The ambient temperature of the pump, when in operation,
should be between 0 and 50°C (32 to 122°F) and should be
protected from direct exposure to outdoor elements (direct sun-
light, rain, extreme temperatures, high humidity, etc.).
• Generally speaking, the shorter the suction distance, the more
efficientthe pumpoperates.
• The pump should be placed in a conventional location that will
allow easy access to the control and connections. It should be
placedsothatregular visual inspections of the connections and
hosesarefacilitated.
Vertical Surface Mounting
Once you have selected the best installation site, simply screw or bolt
the unit into a wall or mounting panel above the chemical feed tank.
The4mountingscrew holes on the pump will accommodate up to a 5
mm (3/16") screw or bolt (remember to use heavy screws or bolts to
securethesystem).Besureyoudonotovertightenandcauseexcessive
stress on the mounting holes.
Make sure to leave a slight overhang in front to allow for the
connectioncable.
Power Supply
Connectthepowercordtothefemalesocketofthepumpandbydoing
so also grounding it. The power socket contains a 250V fuse. Since
there is no on/off switch, it is suggested to install an outside switch.

13
Probe connections
Connect the pH/ORP electrode to the BNC socket of the pump.
Permanent Connection using 3/8" PVC pipe
All piping for the pump feed and dis-
chargeshouldbeplumbedtothelocation
of the pump.
The threads on both valve assemblies
allow the use of standard 3/8" (Euro-
pean) pipe fittings for permanent pipe
connections.
The foot valve assembly (HI721005)
should always hang vertically and not
lay horizontal on the bottom of the tank
or drum.
A vertical assembly will ensure that the
valve is positioned properly and prevent
loss of prime.
For the U.S. standard installations, use
PVC adapters to connect the suction and
discharge valves to the PVC pipe.
UNIONCONNECTION
ADAPTER
DISCHARGEVALVE
PUMP
SUCTIONVALVE
ADAPTER
FOOTVALVE
FILTER
DiagramforRigidPipeHose
-

14
HoseConnections
• Cut a long enough section of the
hose to reach the suction valve of
the pump head from the feed tank.
Allow some slack in the hose and be
sure it is not kinked or twisted.
• Slip a hose connector onto the hose
over the head valve and up to the
bottom of the threads ensuring it is
fullyseated.
• Slide the connector up to the threads
and tighten to form a seal.
• Slip the ceramic weight (HI721008)
and a connector over the other end of
thehose.
• Attach the foot valve assembly
(HI721005) to the hose and slide the
connectorup tothethreadsand tighten
to form a seal.

15
• Repeat the same installation procedure for the hose connections
on the discharge end with the injection assembly (HI721004).
• Secure the hose so that its movement is minimized when the
pump is operating. Excessive hose movement could cause the
connectors to loosen and result in leakage.
Assembling the Hose to the Valve
The end of the valve is specially tapered to
form a leak free seal when the hose is
properly installed.
Be sure to seat the hose completely so that
thereisnogap. Pushthehoseuntilitcovers
the end of the valve completely.
Suction and Discharge Valves
The suction and discharge valves located
on the pump head should not be inter-
changed as they are different internally.
The discharge valve is fitted with a valve
guide and will not function properly if
used on the suction side.

16
LEGEND
HOSE PIPE
CONNECTION
RESEVOIR
MANUAL
SHUTOFF
VALVE
PUMP
FILTER /
FOOT VALVE
CHECK VALVE
EXAMPLE OF TYPICAL INSTALLATIONS
Flooded Suction Installation
SuggestedInstallation forconsis-
tent output when using a low
stroke rate. Also suggested for
highlyviscous chemicals.
A slight suction pressure avoids
self-priming problems, especially
with high viscosity liquids.
Suction Lift Installation
Suggestedinstallationformostin-lineap-
plications with nominal output and
pressures.
The maximum self-priming height is
1.5m (5 ft.). It is advisable to install a
level controller in order to stop the pump
when feed tank (reservoir) liquid level is
low.
Uphill Installation
Suggested installation whenever the supply is located higher than the
discharge point; typically a waste water application.
It is important to install the Injection valve to prevent siphoning.

17
Downhill Installation
Suggested installation when pumping from one container to another,
each at different levels and with only nominal pressure.
START-UP
At start-up, purge all chemical gases and air from the suction tubing,
valves and pump head. Start the pump.
When all the air or gas is vented, the solution being metered will
appear in the output line.
Note:only when operating under pressure, the pump must be started
unloaded.

18
OPERATIONAL GUIDEOPERATIONAL GUIDE
OPERATIONAL GUIDEOPERATIONAL GUIDE
OPERATIONAL GUIDE
• Unscrew and remove the transparent front panel cover and
gasket seal for access to the terminals.
• Remove the protective plastic plate covering the terminals by
removing the 2 screws on both sides of the plate.
TERMINALCONNECTIONS BL7916

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TERMINALCONNECTIONS BL7917
Pt100 (for BL 7916 only)
A 2-wire Pt100 can be connected to provide automatic temperature
compensation of the pH measurements. The pump is supplied with a
100 ohm resistor connected to the 2 Pt100 terminals. This delivers a
fixed temperature compensation of 25°C (77°F). The Pt100 is recom-
mended only in special instances where very high accuracy is
absolutely necessary since the error is only 0.03 pH for a temperature
difference of 10°C in the pH 6 to 8 range. The error will consequently
be less than 0.09 pH at readings from pH 4 to 10 when the
temperature is in the 15°C (59°F) to 35°C (95°F) range.
PROPORTIONAL SETTING
The pump is supplied with a 10K resistor connected to these
terminals. With this value the pump works at 100% of the rating
when the difference between measure and setpoint is more than
150 mV (BL 7917) or 1.5 pH (BL 7916). It goes into proportional
dosing for values less than the above.
You can vary this hysteresis band by simply changing the resistor as
follows: BL 7916 BL 7917
0.50 pH 4.7K 50 mV 4.7K
1.00 pH 5.6K 100 mV 5.6K
1.50 pH 10.0K 150 mV 10.0K
2.00 pH 18.0K 200 mV 18.0K
LEVEL CONTROL
The pump is supplied with these two terminals short-circuited. A
contactcomingfroma levelcontroller(e.g.HI7871,HI7873)canbe
connectedto these terminals. If thiscontact isclosed,thepump works
normally. If it opens, the unit will not pump even if the controller
commands it.

20
For example, a level controller can be placed in the tank of the liquid
being dosed so that the pump is stopped when the chemicals are
exhausted.
MANUAL
An auxiliary switch can be connected to these terminals to force the
unit to pump whatever value is measured by the controller. This
might be needed for example when the pump needs to be primed.
AUXILIARY CONTACT
The controller can drive a relay when the measure overtakes the
setpoint. The contact available on the terminals can be normally open
or closed. It can be used as a switch to drive an external mixer when
the pump is dosing, or can activate an auxiliary pump or any other
device. With BL 7916, the contact can be selected to remain open
when the pH value is within the set limits (the pump is not dosing)
and closed when the pump is dosing or viceversa.
By shorting the Common (middle) terminal with the NO or NC
terminal on the driving circuit inside the controller section, a normally
open or a normally closed state can be achieved, as shown below:
ALARM CONTACT
If the reading drifts from the setpoint by more than ±2.00 pH in
BL 7916 and ±200 mV in BL7917, an external alarm can be
activated. The contact is rated at 2 amps at 220VAC. No power is
supplied through the system and it is an open/closed contact only.
With BL 7916, the contact can be selected to be closed when the
alarm is activated and open when the alarm is off or viceversa. Short
the middle terminal located on the driving circuit inside the controller
section with the NO or NC terminal (see above).
4-20 mA ISOLATED OUTPUT
A 4-20 mA proportional output is available in these connections:
4 mA=0 pH; 20mA=14 pH (BL 7916)
and 4 mA=-999 mV; 20 mA=+999 mV (BL 7917).
The output is optically isolated.