18
11.1 Recommended preventative maintenance
schedule
Every sampling situation is unique. Below are our
recommendations for average conditions. A
higher BTU content will necessitate more frequent
pump/filter maintenance.
a. Clean and lubricate the sample pump every six
months.
b. Check the filter element every six months,
replacing as necessary.
c. Test the battery every month.
d. Test the system for leaks each time a fitting or
connection has been made.
11.2 Cleaning and lubricating the DP-2000N
pump:
a. Close the isolation valve.
b. Disconnect the plastic tubing from the solenoid
valve to the pump diaphragm housing by
depressing the tubing release sleeve on the
diaphragm housing fitting while pulling out the
tubing. It is not necessary to remove the fitting
from the diaphragm housing.
c. Remove the sample discharge (1/8" stainless
steel tubing) from the pump body.
d. Screw the stroke adjustment knob all the way
down to the 0 cc/stroke setting.
e. *Unscrew the pump body by hand from the inlet
check valve assembly. Separation at this point is
recommended to maintain proper tubing location
and alignment between the pump body and the
probe body. Do not remove the inlet check valve
body from the manifold unless cleaning is
necessary. To replace the inlet check valve o-ring,
carefully cut the o-ring off the head of the dart and
stretch the new o-ring over the head of the dart
using a light coat of assembly grease.
f. Remove the diaphragm housing from the pump
body by unscrewing the diaphragm housing and
carefully pulling the plunger out of the pump body.
Inspect the plunger shaft for damage or wear. The
diaphragm chamber houses the diaphragm, return
spring, stroke adjustment screw and plunger
assembly. The diaphragm chamber should not be
disassembled unless one of these items needs
replacing.
*Screw the stroke adjustment screw all the way
down.
11.2 e
11.2 f
11.2 b
11.2 a
11.2 c
11.2 d
11. Sampler maintenance
