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

9
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