Hanna Instruments bl 7917 User Manual

Leakage at the connections:

• Be sure that the hose is fully seated and hose connectors are

tight.

• Be sure that valves are tight and O-rings are in place.

Leakage around the pump head:

• Be sure that the valves are tight and O-rings are in place and

the head screws (hex bolts) are tight.

Kynar

is registered Trademark of "Pennwalt Co."

MAINTENANCE

Your BlackStone Pump is designed to give you years of trouble-free
service. Maintenance should be the preventative type, that is, periodic
cleaning and inspecting for any damage or leakage.

CLEANING THE SUCTION, DISCHARGE AND INJECTION
VALVES

Remove the valves from the pump head, the injection fitting and the
feed.
Keep the suction and discharge valves separated as they are not
interchangeable.
Disassemble each valve and clean it with a neutral liquid. Inspect the
Kynar

springs.

After cleaning the glass balls, inspect them for any excessive wear due
to abrasion from the chemical. Replace if necessary with parts from
HI721102, HI721103, HI721004 and HI721005 (see page 34
for listing).
When reinstalling the valves into the pump head, tighten by hand
first and then with a wrench ¼ to ½ turn.

INSPECTING THE HOSE (if used as supplied with the pump)

Inspect to see if the hose has worn out or weakened due to the
chemicals. Pay particular attention for any signs of abrasion or discol-
oration. Also check the connectors to ensure they are tight.
Replace if necessary with parts from HI720032.

CLEANING THE PUMP HEAD

The pump head should be cleaned at regular intervals and at
least once a year. Remove the deposits that form in the cavities with
a solution that is neutral to the chemical the pump has been dosing.
Inspect the head for any cracks or worn areas.
Replace if necessary with parts from HI721106 (pump head).