Eldex Optos 1LM User manual

Eldex
Eldex®
Optos Metering Pumps
Operator’s Manual
Eldex Laboratories, Inc.
30 Executive Court
Napa, CA 94558
Tel: [phone]
Fax: [phone]
www.eldex.com
Rev. Z: 09112018
© 2018 Eldex Laboratories, Inc.
All Rights Reserved

TABLE OF CONTENTS
CONTENTS PAGE
I. INTRODUCTION 1
Optos Metering Pumps 1
Principles of Operation 1
Materials of Construction 1
About This Manual 1
A Guided Tour of Optos Metering Pumps 2
Specifications 7
Stainless Steel Pump Specifications 7
PEEK Pump Specifications 8
Hastelloy C-276 Specifications 9
II. INSTALLATION 10
What You Will Need 10
The Unit 10
Tools 10
Unpacking and Location 10
Electrical Connections 10
Power Entry Module 10
Inputs/Outputs 10
Plumbing 11
Solvent Preparation 11
Attaching Inlet Tubing 12
Priming The Pump 12
Attaching Outlet Tubing 12
Pulse Damper Use 12
Using the Piston Wash System 13
III. OPERATION 14
Basic Operation 14
General Notes on Software Operation 14
Setting the Flow Rate 14
Setting the High Pressure Limit 14
Setting the Low Pressure Limit 14
Configuration Screens 15
Setting the Compressibility Compensation Factor 15
Sending the Piston to the Home Position 15
Changing the Refill Rate Setup 15
Setting the Liquid End Type 15
Setting the Remote Control Setting 16

Viewing the EPROM Revision Level 16
Advanced Screens 16
Setting the Home Position Offset 16
Setting the Output Function 17
Setting the High/Low Pressure Limit Shutdown 17
Setting the Motor Stall Shutdown 17
Setting the Error Delay 18
Setting the Save State 18
Setting the Save in Run Flow Rate 18
Setting the Contact Closures during Remote Analog Mode 19
Viewing the Stroke Length 19
Zeroing the Pressure Transducer 19
Pump Limits 20
Viscosity Limits 20
Chemical Limits 20
Mechanical Limits 20
Temperature Limits 20
Shutdown Procedures 20
IV. MAINTENANCE 21
Cleaning 21
Piston Seals 21
Replacing The Piston Seal 21
Replacing Valves 23
Removal Of Existing Valves 23
Installation Of New Valves 23
Replacing Valve Cartridges 23
Troubleshooting 25
V. SPARE PARTS AND ACCESSORIES 26
For 3/32” Stainless Steel Pumps 26
For 1/8” Stainless Steel Pumps 27
For ¼” Stainless Steel Pumps 28
For 3/32” PEEK Pumps 29
For 1/8” PEEK Pumps 30
For ¼” PEEK Pumps 31
For 1/8” Hastelloy C-276 Pumps 32
For ¼” Hastelloy C-276 Pump 32
VI. APPENDIX 33
RS232 33
Warranty 34

Return Procedure 34
Trademarks 34

CAUTION: The exclamation point within an equilateral triangle is intended to
alert the user to the presence of important operating and maintenance (servicing)
instructions in the literature accompanying the appliance.
ATTENTION: Le point d’exclamation dans un triangle equilatéral signale à
alerter l’utilisateur qu’il y a des instructions d’operation et d’entretien tres
importantes dans la litérature qui accompagne l’appareil.
ACHTUNG: Ein Ausrufungszeichen innerhalb eines gleichwinkeligen Dreiecks
dient dazu, den Benutzer auf wichtige Bedienungs-und Wartungsanweisungen in
der dem Gerät beiliegended Literatur aufmerksam zu machen.
CAUTION: We have tested this pump with 2 propanol. Residual amounts of 2
propanol may be in the pump. You may wish to flush with an appropriate,
miscible solvent.
You may be using a variety of fluids which require special handling procedures
and safety precautions. Consult the appropriate MSDS (Material Safety Data
Sheet) supplied with the materials you will be using. Be certain to follow all
handling, safety, and disposal procedures appropriate for the materials you use.
ATTENTION: Gardez à l’esprit que nous avons testé cette pompe avec le
propanol-2. Les quantités résiduelles du propanol-2 peuvent se trouver sur le
dispositif de raccordement du liquide et vous souhaiterez certainement les
chasser avec un solvant miscible approprié.
Vous pouvez utiliser une variété de liquides qui nécessitent des manipulations et
des précautions particulières. Consultez la fiche technique de sécurité
appropriée; elle est fournie avec le matériel que vous utiliserez. Veillez a bien
respecter toutes les procédures de manipulation, sécurité et élimination du
matériel.
ACHTUNG: Die Pumpe wurde mit 2-Propanol getestet. Geringe Restmengen
von 2-Propanol können sich noch im System befindend, so dass wir Ihnen vor
Inbetriebnahme das Spülen mit einem geeigneten Lösungsmittel empfehlen.
Sie können eine Vielzahl von Lösungsmitteln einsetzen, deren Verwendung unter
Umständen spezielle Sicherheitsvorkehrungen voraussetzt. Bitte beachten Sie
in allen Fällen die, den Lösungsmitteln vom Hersteller beigelegten
Sicherheitsdatenblätter.
Environmental Protection
Waste electrical products should not be disposed of with household waste.
Please recycle where facilities exist. Check with your Local Authority or retailer
for recycling advice.

1
INTRODUCTION
Laboratory and industrial procedures often require metering precise amounts of fluids in a controlled and
reproducible manner. Optos pumps were developed in response to this need. These pumps are capable of
delivering measured amounts of fluids against significant backpressure.
Pump Features Include:
Piston wash chamber for backflushing piston to extend seal life.
Electronic control of piston motion to minimize pulsation.
Optional pulse damper for further pulse reduction.
Easy to use interface for flow setting and other pump parameters.
Metal-free options
Principles of Operation
Optos pumps attain precise metering at intermediate and high pressures by a positive displacement, reciprocating
piston. The piston is driven by a stepper motor via an eccentric. Advanced software algorithms control motor
speed based on piston position, achieving rapid fluid intake and smooth, constant fluid delivery, minimizing
pulsation. Additional reductions of pulsation can be achieved by use of the optional damper.
Ball and seat inlet and outlet valves ensure precise metering. The suction created by the piston retracting to refill
the piston chamber pulls the inlet ball off the inlet seat allowing fluid to travel through the inlet check valve.
Simultaneously, the outlet ball is pulled back onto its’seat, preventing fluid from exiting the piston chamber.
During the delivery portion of the piston’s duty cycle, the inlet ball is pushed back onto its’ seat as the piston
moves forward, preventing fluid from travelling back to the pump reservoir. Simultaneously, the outlet ball is
forced off its’seat, allowing fluid to exit the outlet valve. For the valves to operate effectively, a pressure
differential of at least 25 psi is required on the outlet side of the pump.
The pump’s flow rate is set directly in mL/min. using the up and down buttons on the user interface. Flow rates
are determined by piston displacement (diameter, and stroke length) and motor speed.
Some Optos pumps may be fitted with a pulse damper. The damper is a diaphragm type damper, where a
diaphragm made of an inert material flexes against a compressible fluid (spiked with red dye), thereby absorbing
pulses in fluid delivery. To maximize the damper’s efficiency, the system should operate against at least 500 psi.
If your system does not normally generate such pressures and you wish to increase the efficiency of the damper,
you can install a backpressure device, or some narrow ID tubing downstream of the pump.
Materials of Construction
The materials used for the liquid end of your Optos Pump were carefully chosen for corrosion resistance. The
piston is sapphire, and the inlet and outlet valves incorporate sapphire seats and ruby balls.
The piston seal material is made from specially formulated PTFE and has excellent chemical compatibility
characteristics.
The liquid end housing is made of passivated type 316 stainless steel because of its superior resistance to
corrosion. In applications requiring the use of chemicals corrosive to type 316 stainless steel, you may order a
PEEK (polyetheretherketone) liquid end or one made of Hastelloy.
About This Manual
This manual provides instructions and information on Optos metering pumps.
Section II of this manual, beginning on page 8, describes the unpacking, location, and initial installation of your
metering pump. Section III, beginning on page 11, describes the operation of the Optos hardware and the menu
system in detail.. Section IV, beginning on page 16, describes maintenance procedures. Section V, beginning on
page 20, contains appendixes, including, lists spare parts and accessories for the various pump models.

2
A Guided Tour of the Optos Metering Pumps
Front Panel
As you look at the front panel of your Optos Metering Pump (Figure 1.1), you will see:
Component Details
Local Interface:
1. Liquid Crystal Display (LCD). Displays flow rate, pressure (with optional pulse damper), other
allowed functions.
2. Up/Down Keys. UP and DOWN arrow keys set flow rates, change pump settings.
3. Permanent Functions Keys. DISPLAY, ΔMENU, and RUN/STOP keys are control keys permanently
defined for direct control of major instrument functions.
4. Status LEDs. Indicate pump running or fault.
Pulse Damper: optional pulse damper for minimized fluid delivery pulsation.
5. Outlet Port: Connection to downstream device.
6. Inlet Port: Connection from pump outlet.
Liquid End Assembly:
7. Outlet Valve: Provides tubing connection for pump output.
8. Cylinder: Contains pumping chamber and piston wash ports.
9. Inlet Valve: Provides tubing connection to fluid source. Inlet valve has an additional groove on
the hexagonal portion of the valve.
Rear Panel
As you look at the rear panel of your Optos Metering Pump (Figure 1.2), you will see:
Component Details
1. RS232: RJ11 connector for RS232 communication.
2. I/O: Input/output connections for remote analog control, pressure out, error out, remote start, stop.
3. Power Entry: Provides power connection with modular cord.
4. Fuse: Housing for pump fuses.
5. On/Off: Turns the power to the pump on and off.

3
Figure 1.1: Front View of Optos
Figure 1.2: Rear View of Optos
1
2
3
4
5
6
7
8
9
1
2
3
4
5

4
An Overall Look at the Local Interface
Operation of the Optos Pump is controlled from a series of menus and there is no need to remember esoteric
control codes or command sequences. A detailed description of the menu sequence is given in Section III.
As you look at the local interface (Figure 1.3), you will see:
Component Details
1. Status LEDs: Upper green LED indicates pump is running; lower red LED indicates a pump fault (for
example, an overpressure limit, or motor stall condition.
2. Display: A one line, 16 character LCD display is used to provide readout of flow and pressure (with
optional pulse damper), and access to pump functions.
3. Up/Down Keys: UP and DOWN arrow keys set flow rates, pressure limits (with optional pulse damper),
and function settings.
4. Permanent Function Keys: ΔMENU key changes the display to different pump functions, DISPLAY key
toggles display back to main display of flow, or flow and pressure (with optional pulse damper),
RUN/STOP key runs the pump and stops the pump.
Key Definitions
ΔMENU: The ΔMENU (Change Menu) key scrolls through the main menu selections.
DISPLAY: The DISPLAY key toggles back to main display of flow, or flow and pressure (with optional pulse
damper).
UP/DOWN: UP and DOWN arrow keys increase or decrease flow rate setting, high or low pressure limit settings,
and change setting of other pump parameters.
DISPLAY, then ΔMENU: Holding down the DISPLAY key followed by pressing the ΔMENU key brings up a series
of sub menus which pertain to various pump settings. Pressing the DISPLAY key alone returns to main display.
ΔMENU, then DISPLAY: Holding down the ΔMENU followed by pressing the DISPLAY key brings up a series of
sub menus which pertain to obscure pump settings. Pressing the DISPLAY key alone returns to main display.
Figure 1.3: Local Interface
1
2
3
4

5
Menu Schematic
The menu schematic indicates the general structure of the menu map. The specific screens shown may vary
from your specific configuration (e.g., pressure is only displayed and high and low limit settings are only
available on the Plus versions).
Basic Screens
XX.XXXmL XXXXpsi
MAIN
HI LIMIT: XXXX
H
LO LIMIT: XXXX
L
Read/set flow
rate
Read pressure
Set high
pressure limit
Set low pressure
limit
ΔMENU
ΔMENU

6
Configuration Screens: DISPLAY & ΔMENU
Advanced Screens: ΔMENU & DISPLAY
GO HOME: HIT RUN
HP
COMPRESS: XX
C
REFILL: FULL OUT
R
HEAD: 1/8 SS
LE
REMOTE: OFF
REM
VERSION: X.XX
V
HOME OFFSET: XX
HO
0-5V OUT: PRESS
S
STROKE: .125
ST
PRESS LIMIT: ENA
LI
Adjust
compressibility
compensation
Set refill:output
ratio
View EPROM
level
Set remote
control
configuration
Set piston &
materials of
pump
Send piston to
forward position
Set pressure
limit ON/OFF
View stroke
length
View/set
voltage out
Set home
position offset
PRESS 0: HIT RUN
XDC
Zero Pressure
Transducer
STOP STALL: ON
SS
Set motor stall
ON/OFF
ERROR DELAY: 0
ED
Set error delay
0-10 (seconds)
SAVE STATE: OFF
SP
Save OFF/ON
state
SAVE IN RUN: OFF
SR
Save flow rate
set during run
OFF/IN
REM CONTACT: OFF
RC
Use start/stop
contacts in
remote OFF/ON

7
Specifications
Stainless Steel Optos/Model 1 Pump Specifications
Model
Flow Rate
Range (min.to
max.) mL/min.
Max
Pressure
(psi)
Piston
Diameter
(inches)
Max.
Piston
Stroke
Piston
Displacement
Electrical
VA
Dimensions (L x W
x H inches)
Weight
(lbs.)
1LM
0.002 - 2.5
6000
.093
.125”
.014 mL
100-230V;
50/60Hz
80
9.5 x 4 x 9
12
1LMP
0.002 - 2.5
6000
.093
.125”
.014 mL
100-230V;
50/60Hz
80
9.5 x 4 x 9
12
1SM
0.003 - 5.0
6000
.125
.125”
.025 mL
100-230V;
50/60Hz
80
9.5 x 4 x 9
12
1SMP
0.003 - 5.0
6000
.125
.125”
.025 mL
100-230V;
50/60Hz
80
9.5 x 4 x 9
12
1HM
0.01 - 20.0
3000
.250
.125”
.1 mL
100-230V;
50/60Hz
80
9.5 x 4 x 9
12
Stainless Steel Optos/Model 2 Pump Specifications
Model
Flow Rate
Range (min.to
max.) mL/min.
Max
Pressure
(psi)
Piston
Diameter
(inches)
Max.
Piston
Stroke
Piston
Displacement
Electrical
VA
Dimensions (L x W
x H inches)
Weight
(lbs.)
2LM
0.003 - 5.0
6000
.093
.250”
.028 mL
100-230V;
50/60Hz
80
9.5 x 4 x 9
12
2LMP
0.003 - 5.0
6000
.093
.250”
.028 mL
100-230V;
50/60Hz
80
9.5 x 4 x 9
12
2SM
0.01 - 10.0
6000
.125
.250”
.05 mL
100-230V;
50/60Hz
80
9.5 x 4 x 9
12
2SMP
0.01 - 10.0
6000
.125
.250”
.05 mL
100-230V;
50/60Hz
80
9.5 x 4 x 9
12
2HM
0.02 - 40.0
1500
.250
.250”
.2 mL
100-230V;
50/60Hz
80
9.5 x 4 x 9
12
Stainless Steel Optos/Model 3 Pump Specifications
Model
Flow Rate
Range (min.to
max.) mL/min.
Max
Pressure
(psi)
Piston
Diameter
(inches)
Max.
Piston
Stroke
Piston
Displacement
Electrical
VA
Dimensions
(L x W x H inches)
Weight
(lbs.)
3LM
0.01 - 10.0
3000
.093
.500”
.057 mL
100-230V;
50/60Hz
80
9.5 x 4 x 9
12
3SM
0.01 - 20.0
1500
.125
.500”
.1 mL
100-230V;
50/60Hz
80
9.5 x 4 x 9
12
3HM
0.04 - 80.0
750
.250
.500”
.4 mL
100-230V;
50/60Hz
80
9.5 x 4 x 9
12
Maximum flow rate specifications are based on the theoretical volume displacement; actual flow rates will vary depending on such factors as fluid viscosity, compressibility, and
temperature.
Common Specifications:
Wetted Parts: Type 316 stainless steel, PTFE, CTFE, sapphire, ruby
Reproducibility: ±0.3% typical
Tubing Connections: Inlet valve: ¼” –28 plastic fitting for 1/8” Teflon® tubing
Outlet valve: 1/16” I.D. ferrule and tube nut, 10-32 thread
Pumps with .250” pistons use 1/8” Swagelok style connections on the inlet and
outlet valves
Other connections available on request
Viscosity Limit: 500 Centipoise
Fuses: .8 A
Operating Environment:
Temperature: 5 –35ºC
Maximum Humidity: 85%, non-condensing
Maximum Altitude: 2,000 meters
Optional Damper
Type: Diaphragm
Wetted Parts: Type 316 stainless steel, Kalrez

8
PEEK Optos/Model 1 Pump Specifications
Model
Flow Rate
Range (min.to
max.) mL/min.
Max
Pressure
(psi)
Piston
Diameter
(inches)
Max.
Piston
Stroke
Piston
Displacement
Electrical
VA
Dimensions (L x W
x H inches)
Weight
(lbs.)
1LI
0.002 - 2.5
4000
.093
.125”
.014 mL
100-230V;
50/60Hz
80
9.5 x 4 x 9
12
1LIP
0.002 - 2.5
4000
.093
.125”
.014 mL
100-230V;
50/60Hz
80
9.5 x 4 x 9
12
1SI
0.003 - 5.0
4000
.125
.125”
.025 mL
100-230V;
50/60Hz
80
9.5 x 4 x 9
12
1SIP
0.003 - 5.0
4000
.125
.125”
.025 mL
100-230V;
50/60Hz
80
9.5 x 4 x 9
12
1HI
0.01 - 20.0
3000
.250
.125”
.1 mL
100-230V;
50/60Hz
80
9.5 x 4 x 9
12
PEEK Optos/Model 2 Pump Specifications
Model
Flow Rate
Range (min.to
max.) mL/min.
Max
Pressure
(psi)
Piston
Diameter
(inches)
Max.
Piston
Stroke
Piston
Displacement
Electrical
VA
Dimensions (L x W
x H inches)
Weight
(lbs.)
2LI
0.003 - 5.0
4000
.093
.250”
.028 mL
100-230V;
50/60Hz
80
9.5 x 4 x 9
12
2LIP
0.003 - 5.0
4000
.093
.250”
.028 mL
100-230V;
50/60Hz
80
9.5 x 4 x 9
12
2SI
0.01 - 10.0
4000
.125
.250”
.05 mL
100-230V;
50/60Hz
80
9.5 x 4 x 9
12
2SIP
0.01 - 10.0
4000
.125
.250”
.05 mL
100-230V;
50/60Hz
80
9.5 x 4 x 9
12
2HI
0.02 - 40.0
1500
.250
.250”
.2 mL
100-230V;
50/60Hz
80
9.5 x 4 x 9
12
PEEK Optos/Model 3 Pump Specifications
Model
Flow Rate
Range (min.to
max.) mL/min.
Max
Pressure
(psi)
Piston
Diameter
(inches)
Max.
Piston
Stroke
Piston
Displacement
Electrical
VA
Dimensions
(L x W x H inches)
Weight
(lbs.)
3LI
0.01 - 10.0
3000
.093
.500”
.057 mL
100-230V;
50/60Hz
80
9.5 x 4 x 9
12
3SI
0.01 - 20.0
1500
.125
.500”
.1 mL
100-230V;
50/60Hz
80
9.5 x 4 x 9
12
3HI
0.04 - 80.0
750
.250
.500”
.4 mL
100-230V;
50/60Hz
80
9.5 x 4 x 9
12
Maximum flow rate specifications are based on the theoretical volume displacement; actual flow rates will vary depending on such factors as fluid viscosity, compressibility, and
temperature.
Common Specifications:
Wetted Parts: PEEK, UHMW Polyethylene, CTFE, sapphire, ruby
Reproducibility: ±0.3% typical
Tubing Connections: Inlet valve: ¼” –28 plastic fitting for 1/8” Teflon® tubing
Outlet valve for Plus versions: 1/16” I.D. ferrule and tube nut, 10-32 thread
Outlet valve for non-Plus versions: 1/16” I.D. fitting, ¼”-28 thread
Other connections available on request
Viscosity Limit: 500 Centipoise
Fuses: .8 A
Operating Environment:
Temperature: 5 –35ºC
Maximum Humidity: 85%, non-condensing
Maximum Altitude: 2,000 meters
Optional Damper
Type: Diaphragm
Wetted Parts: PEEK, Kalrez

9
Hastelloy C-276 Optos/Pump Specifications
Model
Flow Rate
Range (min.to
max.) mL/min.
Max
Pressure
(psi)
Piston
Diameter
(inches)
Max.
Piston
Stroke
Piston
Displacement
Electrical
VA
Dimensions (L x W
x H inches)
Weight
(lbs.)
1SMH
0.003 - 5.0
6000
.125
.125”
.025 mL
100-230V;
50/60Hz
80
9.5 x 4 x 9
12
2SMH
0.01 - 10.0
6000
.125
.250”
.05 mL
100-230V;
50/60Hz
80
9.5 x 4 x 9
12
3SMH
0.01 - 20.0
6000
.125
.500”
.1 mL
100-230V;
50/60Hz
80
9.5 x 4 x 9
12
1HMH
0.01 - 20.0
3000
.250
.125
.1 mL
100-230V;
50/60Hz
80
9.5 x 4 x 9
12
2HMH
0.02 - 40.0
1500
.250
.250
.2 mL
100-230V;
50/60Hz
80
9.5 x 4 x 9
12
3HMH
0.04 - 80.0
750
.250
.500
.4 mL
100-230V;
50/60Hz
80
9.5 x 4 x 9
12
Maximum flow rate specifications are based on the theoretical volume displacement; actual flow rates will vary depending on such factors as fluid viscosity, compressibility, and
temperature.
Common Specifications:
Wetted Parts: Hastelloy C, PTFE, CTFE, sapphire, ruby
Reproducibility: ±0.3% typical
Tubing Connections: Inlet valve: 1/8” compression fitting
Outlet valve: 1/8” compression fitting
Viscosity Limit: 500 Centipoise
Fuses: .8 A
Operating Environment:
Temperature: 5 –35ºC
Maximum Humidity: 85%, non-condensing
Maximum Altitude: 2,000 meters

10
INSTALLATION
What You Will Need
The Unit
A Optos Pump consists of the pump assembly, a fittings kit for tubing connections (except for ¼” piston
stainless steel pumps, which have fittings attached to the valves), a syringe (except ¼” pumps), a power cord,
this manual and warranty card.
Tools
You will not need special tools for the routine use of your OptosPump. For installation, all you will need are a
few wrenches to attach the fittings and perhaps a small blade screwdriver if you are making I/O connections.
The tool sizes you will need will depend on the specific fittings used (and are referenced in the appropriate
section of the instruction manual). If you have not already ordered a Preventive Maintenance Kit, we suggest
you consider doing so now. A listing of the various PM Kits beings on page 17.
Unpacking and Location
Before attempting to operate your pump, unpack it carefully. You should not discard any packing material, as
you will want to re-use it for storage and shipping. If any damage is evident from improper handling from
shipping, you should contact the freight company that delivered the unit to file a claim.
CAUTION: We have tested this pump with 2 propanol. Residual amounts of 2
propanol may be in the pump. You may wish to flush with an appropriate,
miscible solvent.
You may be using a variety of fluids which require special handling procedures
and safety precautions. Consult the appropriate MSDS (Material Safety Data
Sheet) supplied with the materials you will be using. Be certain to follow all
handling, safety, and disposal procedures appropriate for the materials you use.
You must use your Optos Pump in a clean, well ventilated and dust free environment, free of corrosive or
explosive vapors. Optos Pumps are designed for table top use; you should not install your pump on the floor.
Your Optos Pump must be operated in a horizontal position. Safety may be impaired if use of your Optos pump
is not as instructed.
Electrical Connections
Power Entry Module
As you look at the Power Entry Module (Figure 2.1), you will see:
1. ON/OFF Switch
2. Fuse Drawer
3. Power Inlet
4. Fuses
The power entry module is self selecting for voltage within the range of
100-240V. The power cord (a 110/115V cord is provided) is plugged into
the power inlet. Plug the power cord of the pump into a grounded, properly
rated outlet and turn the power switch to ON. The power is turned on by
positioning the ON/OFF switch so the “1” is depressed. After you have
confirmed there is electrical power, turn the power off by positioning the
ON/OFF switch so the “0” is depressed.
Inputs/Outputs
I/O functions are available on the connector on the rear panel. To wire the
I/O connector for inputs or outputs, use a small screwdriver to depress the lever in the upper port of the I/O
Figure 2.1: Power Entry Module
1
2
3
4

11
connector; this will open the lower port of the I/O connector. Insert the wire (strip wires by between 1/8” to ¼”)
and release the upper port lever.
Inputs
The Optos can be remotely controlled from devices which can send current loop or voltage signals. In addition,
the Optos can be remotely controlled using contact closures. The remote inputs available are defined in Table
2.1:
Table 2.1
I/O Position
Label
Function
Description
1
4-20mA
4-20mA current loop
Allows for remote control of flow rate using a 4-20mA
current loop. Wire signal to position 1 and common to
position 2.
2
Common
Common
Used in conjunction with position 1.
3
5VDC
5 VDC
Allows for remote control of flow rate using a 0-5VDC
control. Wire signal to position 3 and common to
position 5.
5
GND
Ground
Ground position for use in conjunction with position 3, 6
or position 7.
6
RUN
Run pump
Contact closure, starts running pump at set flow rate.
7
STOP
Stop pump
Contact closure, stops pump.
Outputs
The Optos can send contact closures and an analog signal to remote devices. The remote outputs available are
defined in Table 2.2:
Table 2.2
I/O Position
Label
Function
Description
4
PRESS
Output of pressure
0-5 VDC output of pressure (when optional damper is
installed), or flow (0-5VDC). Signal output is on
position 4; use with ground on position 5.
5
GND
Ground
Used in conjunction with position 4 or position 8.
8
ERROR
Error output
TTL high output indicating pump error (pressure limit
violation when used with optional damper; motor stall).
Signal output is on position 8; use with ground on
position 5.
RS232
The RJ11 connector on the rear panel provides an RS232 communication port. For details on use of the RS232,
consult Section VI.
Plumbing
Solvent Preparation
Solvent Degassing
We strongly recommend you degass the fluid prior to using it to prevent cavitation. There are many means of
degassing the fluid, including ultrasonication and vacuum systems. Many users find helium sparging convenient
and effective. The usual procedure is to sparge the solvent vigorously for 15 minutes or so and then maintain a

12
trickle of helium during solvent use. Some users blanket the reservoir with helium after sparging (pressurize
reservoirs to about 3 psi with helium).
Solvent Filtration
You must filter your solvents. We recommend you install a 10 micron sintered stainless steel filter (P/N 5776)
on the inlet line. When you wish to avoid metal, a 10 micron plastic filter is available (P/N 1279).
Attaching Inlet Tubing
Most Optos pumps come supplied with a fittings kit, which includes inlet tubing, as well as inlet and outlet nuts
and ferrules. Attach the 1/8” Teflon tubing to the inlet valve. Hand tighten the nut onto the valve.
Optos stainless steel pumps with ¼” diameter pistons use 1/8” Swagelok® fittings on the inlet and outlet valves
and use 1/8” tubing (not supplied) and require a 7/16” wrench to tighten the fittings and a ½” wrench to tighten
the valves.
Priming the Pump
After you attach the inlet tubing to the pump, place the other end of the tubing in a reservoir of the liquid you
will be pumping. Be certain you completely submerge the end of the tubing (or the filter) in the liquid. Insert
the syringe into the outlet (top) valve opening. You should exercise care when handling the syringe. Improper
use can cause the syringe to break off in the valve (and you will have to install a new valve).
Turn the power switch to ON, set a flow rate (usually, for priming, an elevated flow is desireable) and press the
run key. Manually draw a few milliliters of fluid into the syringe. Remove the syringe and look at the valve
opening. There should not be traces of air bubbles. If the air bubbles persist, turn off the pump, check the liquid
level in the reservoir and the tightness of the inlet fitting. If the inlet tubing is above the surface of the liquid, or
if the inlet fitting is loose, you will need to correct the condition and repeat the priming procedure. When the
pump is primed, press the stop key.
Attach Outlet Tubing to Pump (if required)
With a ¼” wrench, attach 1/16” tubing (not supplied) to the outlet (top) valve using the tube nut and ferrule. Do
not set the ferrule in the valve, since doing so may compress and damage the valve components. Instead, set the
ferrule onto the tubing in a column or similar non-compressible fixture. Always stabilize the valve housing with
a ½” wrench when attaching fittings. Never tighten fittings to beyond 40 in./lbs., or the point where no leakage
occurs. Excessive force in tightening fittings can result in valve compression and damage. On PEEK® pumps,
the fitting on the outlet valve is hand tightened.
Optos stainless steel pumps with ¼” pistons use
1/8” Swagelok® fittings on the inlet and outlet
valves and use 1/8” tubing (not supplied) and
require a 7/16” wrench to tighten the fittings and
a ½” wrench to tight the valves.
Pulse Damper Use (optional
damper on Optos pumps with
.093 or .125 pistons)
Optos pumps provided with a pulse damper
have a line already connected between the pump
outlet and the damper inlet. Priming the system
is achieved in the same way as outlined above,
except the syringe is attached to the outlet port
of the damper.
Attaching outlet tubing to the outlet port of the
damper is achieved in the same way as outlined
above. Excessive force in tightening fittings can
damage the damper, which is expensive to
replace.
Figure 2.2: Liquid End Assembly
Wash Ports
Inlet Valve
Outlet Valve

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Using the Piston Wash system
The use of buffers or solutions which crystallize when exposed to air can lead to abrasion of the piston seal.
Optos pumps have a built-in wash chamber. The wash system is designed to flush the back end of the primary
piston seal. By using the wash system, you can significantly extend the life of the piston seal (particularly when
pumping salt solutions). Your choice of a wash solution depends on the nature of the fluid being pumped
(usually a mixture of water with 20% methanol is suggested).
The pump cylinder has two barbed fittings installed. Usually, the lower fitting is used as the wash inlet and the
upper fitting is used as the wash outlet. Attach 1/8” ID tubing to the inlet and outlet ports of the wash system. A
common means of employing the wash system is to use a syringe attached to the wash outlet tubing to pull fluid
into the wash chamber (when fluid comes out the outlet port, you know you have filled the wash chamber). We
recommend flushing the wash chamber periodically to minimize piston seal abrasion.. Alternatively, you could
deliver fluid continuously through the wash system by circulating the wash solution with a pump.

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OPERATION
Basic Operation
Optos pumps perform more reproducibly if there is some degree of backpressure (preferably at least 25 psi). In
all cases, outlet resistance must exceed inlet pressure. Otherwise, the fluid will simply flow through the pump
without being metered. If the system in which the pump is being used does not generate enough backpressure,
we suggest you install a device, e.g., a “dummy” column or a backpressure regulator, to artificially maintain the
appropriate backpressure. The ideal setup for the pump is where there is a little positive pressure on the inlet
side of the pump (achieved by elevating or pressurizing the reservoir) to minimize cavitation, and substantially
greater outlet pressure to maximize valve efficiency.
General Notes on Software Operation
The Optos pumps have intuitive software control. Three separate levels of software control can be accessed.
The most common commands, setting the flow rate and the high and low pressure limits, are accessed either
from the main display screen, or by pressing the ΔMENU key (the ΔMENU key will cycle through commands for
each level of software control). More infrequently used commands are accessed by holding down the DISPLAY
key and pressing the ΔMENU key (commands which send the piston to the home position, setting the
compressibility compensation factor, setting the refill/output ratio, changing the liquid end type, setting the
remote mode, and viewing the EPROM revision). Least frequently used commands are accessed by holding
down the ΔMENU key and pressing the DISPLAY key (commands which set the home offset, voltage output,
whether the high and low pressure limits will be activated, and the stall stop condition).
The UP and DOWN keys change the setting of the various parameters. When the setting is numeric, the longer the
key is held down, the faster the value changes. The DISPLAY key returns to the main display of flow (and
pressure when the optional damper is installed).
Setting the Flow Rate
When the power is turned ON, the
display shows the set flow rate (and
pressure when the optional damper is
installed).
To set the flow rate, press the UP arrow
key to increase the flow set point, press the DOWN arrow key to decrease the flow set point. The longer you hold
down the up or down arrow, the faster the display scrolls through flow settings. To run the pump at the flow set
point, press the RUN/STOP key. The green LED will be illuminated when the pump is running.
Setting the High Pressure Limit
Optos pumps fitted with a pulse damper
are able to have high pressure limits set.
The default setting is the maximum
pressure capability of the model. To
change the setting, press the ΔMENU key
once. Use the UP or DOWN arrow key to
increase or decrease the high pressure limit. To return to the main screen, press the DISPLAY key.
When the high pressure limit is violated, the pump stops running, the lower red LED lights and the display
shows HI PRESS XXXX.
Setting the Low Pressure Limit
Optos pumps fitted with a pulse damper are
able to have low pressure limits set.
The default setting is the zero psi. The
maximum setting is 50 psi less than the
high pressure limit. To change the setting,
Turn power ON
Use UP and DOWN keys to set
Press RUN/STOP key to run pump
XX.XXXmL XXXXpsi
MAIN
HI LIMIT: XXXX
H
Press ΔMENU key
Use UP and DOWN keys to set
Press DISPLAY key to return to
main display
LO LIMIT: XXXX
L
Press ΔMENU key (twice from
main display)
Use UP and DOWN keys to set
Press DISPLAY key to return to
main display