Piston Pump User Manual

Introduction

Welcome to the world of precision fluid delivery. Diener Precision Pumps is recognized worldwide as the leader in low-flow fluid transfer, with designs that combine simplicity, reliability, and accuracy. Our Swiss manufacturing techniques represent the best available combination of craftsmanship and technical expertise.

Before using one of our products, take a moment to read through this manual. It will give you a brief overview of pump terminology, a definition of the pump components, and some tips to ensure successful operation of the pump. Please understand that the user must take full responsibility for his/her safety when using and applying

Diener products. If you have any doubts about pump operation or safety, contact our customer service representatives.

Customer Support: Phone: +41 44 866 7272 (Switzerland)

E-mail: [email protected]

+1 (209) 365-0405 (USA) www.dienerprecisionpumps.com

Warning! Mis-use of this product can result in serious injury and death. Do not operate this product outside the pressure, temperature, and material limits set forth in this manual and the pump’s individual specification sheet.

II.

III.

IV.

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Table of Contents

I. Definition of Terms and Pump Components

Installation

Operating Guidelines

Specifications

Troubleshooting

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I. Definition of Terms and Pump Components

Fluid Terms

Viscosity

Differential Pressure

Static Case Pressure

Flow-rate

Fluid Temperature

Ambient Air Temperature

Mixed Phase the relative thickness of the fluid (higher viscosity = thicker fluid) the relative difference between the outlet and inlet of the pump

(the pressure “boost” provided by the pump) the pressure inside the pump when the pump is turned off the flow through the pump, usually expressed in milliliters/minute the temperature of the fluid in the pump the temperature of the environment outside the pump the fluid contains a combination of gas and liquid

Pump Terms

Cavitation

Self-priming

Dry-running

Starved

Accuracy

Precision cV

«Sticking»

Duty Cycle vapor bubbles that form when the pressure falls below the vapor pressure of the fluid a pump’s ability to prime itself the period of time during which a pump can run dry without damage the pump inlet is “starved” for fluid, usually due to an inlet restriction or no priming flow comparison of the “average” dispensed value with the actual dispensed value repeatability of the dispensed value coefficient of variation, defined as the standard deviation divided by the mean value (for a group of samples) the term used to describe a piston that will not move in the cylinder the amount of time a pump a pump is turned “on”

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II. Installation

1. Handle the pump carefully. Hard impacts or rough handling can damage the fittings and/or loosen the pump from its base.

2. Particulates in the fluid can harm the pump. We recommend that the fluid be filtered using a

2-micron (or smaller) filter mesh.

3. For pumps fitted with tapered (NPT) port threads, use a suitable liquid thread sealer or

Teflon tape. For pumps with ¼-28 UNF threads, tighten the fittings hand-tight only. Tubes should always be secured to the fitting using a locking clamp.

Example of ¼-28 UNF bottom sealing fitting Example of pump with rinse ports at rear of

(bottom) and face sealing fitting (top) pump (note: hose clamps have been removed for photo clarity).

4. If the pump is fitted with rinse ports (photo, above right), install tube fittings as shown and follow the pressure guidelines shown on the pump specification sheet.

5. The piston pumps can be run dry for short periods of time, but to improve the pump’s priming ability, we recommend wetting the pump’s internal surfaces before startup.

6. If your pump is equipped with a rotational sensor, connect the leads as shown on the pump specification sheet. Failure to do so could result in permanent damage to the sensor.

Optical Sensor Hall Sensor

7. All electrical connections should be carried out by individuals qualified according to local electrical installation regulations. The electrical supply should match the motor nameplate values; all power should be turned off prior to making the connection. For motors supplied with separate speed control and tachometer leads, please follow the color coding information. Failure to do so may result in permanent motor damage and/or fire.

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III. Operating Guidelines

When starting the pump, allow it to run for a brief period to remove all air in the lines. The displacement/stroke volume is typically very low, so air-removal may take a long time (depends on total volume of air in the system). For best results, the pump outlet should be exiting vertically.

The pump is reversible: reversing the motor rotation direction will reverse the flow direction.

These pumps have a very small clearance between the piston and cylinder. To minimize the possibility of the piston “sticking” in the cylinder, we recommend that the fluid be filtered to 2 microns and that the piston be kept in the “fully in” position whenever the pump is shut off for long periods of time. If the pump is removed from service, rinse the pump thoroughly and cover the ports with a suitable plug to prevent the surfaces from drying. (If the fluid dries and crystallizes, the pump will need to be cleaned -- see section V of this manual.)

For detailed information about the operating limits of the pumps, please refer to the pump specification sheet. Other guidelines to follow include:

Temperature: Do not allow fluid to freeze in the pump: the expansion can cause structural and seal damage.

Pressure: Do not over-pressurize the pump (refer to the upper limits provided in the specification sheet). Failure to do so may damage the pump and cause serious injury.

Chemical Attack: Expose the pump only to chemicals that are known to be compatible with the wetted materials in the pump (refer to specification sheet for a wetted materials list). Use protective clothing whenever handling dangerous fluids and follow the recommendations in the fluid’s material safety data sheet (MSDS).

Immersion: Do not immerse the pumps in water, and under no circumstances should the motor be exposed to water (could result in injury or death).

IV. Specifications

Please refer to the individual pump data sheet for technical and dimensional specifications.

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V. Troubleshooting

Problem Possible Cause

Pump does not pump No power

Restriction in the lines

The piston is stuck

Pump makes a

“clicking” or

“popping” sound once/revolution

Pump is cavitating

Pump outlet is blocked

Bubbles are present in the inlet /outlet

Leaking fittings

Pump is cavitating

Air is trapped within the system

Pump stalls at high temperature

Rotational sensors do not work correctly

Motor overheating

Loose connector

Connection polarity not correct

Pump spins backwards Polarity reversed

Solution

Check motor power

Check the lines for obstructions and/or closed valves

Try to free the piston by turning it gently.

If this does not work, remove the pump from the bracket and soak it in warm soapy water for 5-10 minutes, then try to turn it. If the problem persists, consult the factory.

Slow the motor speed

Check the lines for obstructions and/or closed valves

Check the fitting seals and/or retighten

Lower the motor speed

Raise the lines individually to remove pockets of air – this may take time, depending on the total volume within the lines.

Reduce the load on the pump. Let the motor cool, then check the motor driver to ensure it conforms to the limits of the motor nameplate (also see the specification sheet, provided separately).

Unplug, then reattach the connector

Verify that sensor is connected properly

Reconfigure the motor wiring to run in the opposite direction (see specification sheet)

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