FMI PD-60-LF User Manual

FMI PULSE DAMPENER PD-60-LF

INSTALLATION & OPERATION INSTRUCTIONS

The FMI steady flow accessory is designed to effectively suppress
approximately 90% of the pulse magnitude generated by piston type
metering pumps operating at flow rates up to 50 ml/min and stroke
rates up to 150 per minute against head pressures of 10 to 65 psig.
It features low internal volume, isolated pressure gauge, corrosion
resistant wetted parts of type 316 stainless steel and TFE, flow­through (self purging) design, excellent reduction of base line drift
and noise in feeding low-pressure liquid chromatographic systems,
all in a small (2.7” X 5” X 6” high), lightweight (1.6 pounds net) pack­age arranged to accept standard ¼-28 tubing accessories.

1. CIRCUIT LOCATION: The FMI PD-60-LF Pulse Dampener is
designed for flow-through installation in the tubing line between a
pulse source (pump) and a system load (chromatography col­umn, spray nozzle or other). Figure 1 illustrates a typical liquid
chromatography circuit employing the FMI PD-60-LF Pulse
Dampener.

2. CONNECTION: The FMI PD-60-LF Pulse Dampener is threaded
to accept standard (1/4-28 thread) fittings for small bore labora­tory tubing. Care should be taken to avoid damage to the fine
threads in the Dampener Body when applying fittings. Fittings
should be screwed into the threaded holes of the Dampener
Body finger tight plus ¼ turn wrench tight.

3. PREPARATION: Before operating an FMI PD-60-LF Pulse
Dampener in a circuit application, it is advisable to flush interior
fluid passages of the dampener for a few minutes with system
fluid to remove fluid residues that may remain from earlier usage
or factory test.

4. TUNING: The FMI PD-60-LF Pulse Dampener is tuned to sys­tem operating conditions by turning the handle clockwise (down)
to stop position and, with the pump running, permitting the pres­sure to build up to a level of consistent sequential pulses as will
be noted in repeated fluctuation of the pressure gauge needle.
The handle is then turned slowly in the counterclockwise (up) di­rection until the gauge needle fluctuations suddenly diminish in
magnitude. At that point, pulse suppression is roughly adequate
for most system applications. Fine tuning for critical applications
may be accomplished by carefully turning the handle up and
down in small increments from that first point of pulse suppres­sion until the point at which the smallest gauge needle fluctuation
is found: this is the optimum adjustment position for the specific
circuit hook-up involved.

5. STORAGE: When and FMI PD-60-LF Pulse Dampener is to be
stored, it is recommended that the control handle be turned
counterclockwise (up) until loose in its threads. This relieves
spring pressure on the diaphragms (the best storage condition)
and permits low pressure flush cleaning, which should be done
before storage.

IS9001
IN-PD60LF-03A
PRINTED IN USA