Model EM-1
Econo UV
Monitor
Instruction
Manual
Catalog Numbers
731-8160
731-8162
For Technical Service
Call Your Local Bio-Rad Office or
in the U.S. Call 1-800-4BIORAD
(1-800-424-6723)
Warranty
Model _________________________________________
Serial Number __________________________________
Date of Delivery_________________________________
Warranty Period _________________________________
Unless otherwise specified, instruments sold by Bio-Rad
Laboratories are under warranty for 1 year against defects in materials
and workmanship.
If any defects should occur during this warranty period, Bio-Rad
will replace the defective parts without charge. However, the following
defects are specifically excluded:
1. Defects caused by improper operation, accident, or misuse.
2. Repair or modification done by anyone other than Bio-Rad
Laboratories or their authorized agent.
3. Deliberate or accidental misuse
4. Damage caused by disaster.
5. Damage due to use of improper solvent or sample.
6. Damage due to spills.
This warranty does not apply to flow cell, UV lamp, fittings, tubing,
and fuses.
For inquiry or request for instrument repair service, contact Bio-Rad
Laboratories after confirming the model and serial number of your
instrument.
For Technical Service Call Your Local Bio-Rad Office or in the U.S.
Call 1-800-4BIORAD (1-800-424-6723).
Table of Contents
Section 1 Safety.......................................................................... 1
Section 2 Introduction............................................................... 2
Section 3 Unpacking.................................................................. 2
Section 4 Description and Features......................................... 4
4.1 Front Panel Functions ......................................................... 4
4.2 Rear Panel Sockets.............................................................. 6
4.3 Optics Module..................................................................... 7
Section 5 Setting Up .................................................................. 8
5.1 Voltage Conversion ............................................................. 8
5.2 Wavelength Selection.......................................................... 9
5.3 Optics Module Installation.................................................. 9
5.4 Connecting the Model EM-1 Econo UV Monitor to
Recording Equipment ......................................................... 10
Section 6 General Operation.................................................... 10
Section 7 Care and Maintenance............................................. 11
Section 8 Troubleshooting ........................................................ 12
Appendix A Flow Cell Replacement ............................................ 14
Appendix B UV Lamp Replacement............................................ 15
Appendix C Rear Panel Connections........................................... 17
Appendix D Technical Specifications ........................................... 18
Appendix E Product Information................................................. 19
Section 1
!!!
Safety
Disconnect supply before servicing. No user serviceable parts
inside. Refer servicing to Bio-Rad service personnel.
Disconnect supply before removing optics module connector.
Optics module produces ultraviolet radiation. Disconnect supply
before changing filter or flow cell.
This instrument is intended for laboratory use only.
This product conforms to the “Class A” standards for electromagnetic emissions intended for laboratory equipment applications.
It is possible that emissions from this product may interfere with
some sensitive appliances when placed nearby or in the same circuit
as those appliances. The user should be aware of this potential and
take appropriate measures to avoid interference.
1
Section 2
Introduction
Fig. 2.1. Model EM-1 Econo UV Monitor.
The Model EM-1 Econo UV Monitor is a high quality dual wavelength detector for liquid chromatography. The monitor consists of a
control unit and a portable optics module. The optics module comes
equipped with two interchangeable filters (280 nm and 254 nm), a userserviceable mercury lamp, and a 2 mm pathlength flow cell. All filters
and flow cells are easily changed in minutes, and polypropylene luer
connectors allow rapid tubing connections. The Model EM-1 Econo UV
Monitor functions as a stand-alone instrument, or as an integral part of
a low pressure chromatography system.
For technical specifications, refer to Appendix D.
Section 3
Unpacking
Carefully remove the contents of the shipping box, and check for
any obvious damage or problems with the instrument. Figure 3.1 shows
the parts included with the Model EM-1 Econo UV Monitor. Check off
all parts against the supplied packing list.
If any parts are missing or damaged, contact Bio-Rad Laboratories
immediately.
2
Cable #4
(4)
(4)
(4)
(2)
Fittings
Power Cord
Also includes: Instruction Manual
Fig. 3.1. Parts supplied with the Model EM-1 Econo UV Monitor.
Optics Module
Control Unit
3
Section 4
Description and Features
The Model EM-1 Econo UV Monitor consists of two units. The
control unit houses the controls and the majority of the electronics,
while the optics unit contains the UV lamp, the flow cell, and filter tray,
which contains both 254 nm and 280 nm filters.
The following tables and illustrations describe the features of the
Model EM-1 Econo UV Monitor. For additional functions available
when operating with other low pressure components, refer to Section 7.
4.1 Front Panel Functions
Fig. 4.1. Front panel controls.
Display Function
UV Lamp On/Off Pressing this key will turn the
UV lamp on. Pressing and holding it for 3 seconds will turn the
lamp off. The indicator light is
lit whenever the UV lamp is on
and functioning properly. It
turns off if the lamp is off, and
flashes if the lamp has low output. Note: The indicator will
flash for a few minutes when
the UV lamp is first turned on.
4
Display Function
Range Selector Allows the user to select one
of eight range settings between
0.01 and 2.00 AUFS
(A
bsorbance Units Full Scale).
Level Indicator This bar graph is a convenient
graphic representation of the %
AUFS. Each green segment
equals 10% full scale.
Auto-Zero Sets output voltage to 0.00 and
defines that as the baseline. (A
maximum of 0.25 AUFS can be
zeroed out.)
Event Mark Causes a mark to be superim-
posed on the recorder trace.
5
4.2 Rear Panel Sockets
Fig. 4.2. Rear panel sockets.
The rear panel of the Model EM-1 Econo UV Monitor control unit
contains four sockets for electrical connections (see Figure 4.2). Below
is a brief description of each socket. For a more technical description of
each socket, see Appendix C.
Socket Function
Power Entry IEC power entry module with
Module four-position international voltage
selector. The monitor is shipped in
its 120 V or 220 V version. For
operation at other voltages, refer to
Section 5.1. Note: Power switch is
on bottom panel.
Signal Output For connection of chart recorders,
integrators, and computers to the
Model EM-1 Econo UV Monitor,
using standard Bio-Rad cables, see
Section 5.4 and Appendix C.
Optics Module 12-pin socket for connection of the
Socket optics module.
6
7
4.3 Optics Module
Rack Mount
Fluid In/Out Ports
(Note arrows on
the top side)
Socket Function
Auxiliary Socket Input/output to allow the UV
monitor to be used with
equipment other than the
Bio-Rad components. See
Section 7 and Appendix C.
Filter Tray
Lamp Housing
Flow Cell
Power/Signal
Cord
Fig. 4.3. The optics module.
Filter Tray Contains filters for 254 nm and 280 nm. See
Section 5.2 for wavelength selection.
Fluid In/Out Ports Female luer fittings allow convenient
plumbing. (Slip fittings have been provided to
facilitate the use of PTFE tubing.)
Rack Mount Allows simple mounting on a rack or the top
of control unit.
Power/Signal Cord For connection of the optics module to the
socket on the rear panel of the control
unit.
Lamp Housing See Appendix B for lamp replacement.
Flow Cell See Appendix A for flow cell replacement.
Compartment
Section 5
Setting Up
5.1 Voltage Conversion
Warning: The Model EM-1 Econo UV Monitor is shipped in its 120 V
or 220 V version. To operate at other voltages, refer to the procedure
below. Failure to follow this procedure may result in damage to the unit
and invalidation of the warranty.
Prior to connecting the power cord to the power entry module and
the mains outlet, make sure that the voltage setting showing on the
power entry module matches your line voltage. If these voltages do not
match, use the following procedure to make the conversion. Refer to
Figure 5.1.
Remove the fuse drawer with a small-blade screwdriver or similar
tool.
Pull the fuse holder out of the fuse drawer and, if necessary, replace
the fuses with ones having the correct rating. Use 0.5 A fuses for 100 V
and 120 V operation, and 0.25 A fuses for 220 V and 240 V operation.
Units shipped in the 120 V and 220 V version are fused properly prior
to shipment.
Reinsert the fuse holder into the fuse drawer so that the proper mains
voltage is showing through the window of the fuse drawer.
Reinsert the fuse drawer into the power entry module. Press gently
until it snaps into place.
Fuse Holder
Fig. 5.1. Voltage conversion.
8
Fuse Drawer
5.2 Wavelength Selection
!
The Model EM-1 Optics Module Assembly is shipped with a filter
tray containing filters for both 254 nm and 280 nm (note markings on
the filter unit). It is shipped in the 280 nm configuration. To change from
one wavelength to another, loosen the retaining screw and remove the
filter tray. Rotate the tray 180Þ and reinsert (do not over-tighten the
thumb screw). The light path is indicated by the ³ on the bottom of the
case.
Fig. 5.2. Filter selection.
Warning: To avoid exposure to UV radiation, make sure that the
UV lamp is off when changing filters and flow cells.
5.3 Optics Module Installation
1. Place the optics module as close as possible to the column outlet and
connect the power/signal cord to the socket on the rear panel
of the control unit.
2. Connect the inlet port of the optics module to the column outlet
using tubing that has a male luer fitting. Keep this section of tubing
as short as possible. Direction of flow through the flow cell is
indicated by raised arrows on top of the optics module. Observe
flow direction carefully, as the flow cell may tend to trap bubbles if
flow direction is reversed.
3. Connect the exit port of the optics module to a collection apparatus
using the shortest length of tubing possible.
9
5.4 Connecting the Model EM-1 Econo UV Monitor
to Recording Equipment
The Model EM-1 Econo UV Monitor is shipped with a cable (System
Cable 4) that allows connection of the monitor to devices that use banana
plug connectors. System Cable 2 is available separately to connect the
Model EM-1 Econo UV Monitor to the Model 1327 Chart Recorder.
Following is a description of connections to recording instruments.
Connecting the Model EM-1 Econo UV Monitor to the Model
1327 Chart Recorder
Use System Cable 2 (supplied separately) to connect the remotecontrol socket on the rear panel of the Model 1327 Chart Recorder to the
socket on the rear panel of the Model EM-1 Econo UV Monitor. (If
you do not have Cable 2, use Cable 4 supplied with the UV monitor and
read the next two paragraphs.) Set the input range on the Model 1327
Chart Recorder to 1 V full scale.
Connecting the Model EM-1 Econo UV Monitor to Other
Chart Recorders
If the Model EM-1 Econo UV Monitor is to be used with a chart
recorder other than the Model 1327 Chart Recorder, System Cable 4
should be used to make the connection.
Insert the 8-pin connector into the socket on the rear panel of
the Model EM-1 Econo UV Monitor. At the other end of the cable are
two banana plugs. The red plug is the positive output, and the black plug
is the negative, or ground. These plugs should fit directly into the input
sockets of most chart recorders. Set the input range on the chart recorder
to 1 V full scale.
Connecting the Model EM-1 Econo UV Monitor to
Integrators and Computers
Refer to Appendix C.
Section 6
General Operation
1. Turn on instrument by pressing power switch on the underside of the
control case.
2. Turn the UV lamp on (if it is not already on) by pressing the On/Off
key on the front panel of the control unit. The lamp indicator light
should start flashing, and may continue to do so for several minutes.
10
When the light stops flashing and remains lit, the Model EM-1
Econo UV Monitor is ready for use. Wait at least 20 minutes if an
AUFS setting of 0.05 or less is to be used.
Note: If the Model EM-1 Econo UV Monitor is used in a cold room
or cold box, leave the lamp on continuously to prevent the formation
of condensation.
3. Start the flow of buffer or solvent, and continue for several minutes
prior to starting a separation or measurement.
4. Select an AUFS range using the arrow selector keys on the front
panel of the control unit.
5. Press the Auto-Zero key on the front panel until the yellow light at
the bottom of the graphic display starts flashing. When it stops
flashing, adjust the chart recorder baseline.
Section 7
Care and Maintenance
The Model EM-1 Econo UV Monitor requires very little mainte-
nance to assure reliable operation. Following are general procedures for
maintenance of the UV monitor and optics module.
Model EM-1 Econo UV Monitor control unit and optics module
case: During normal operation, spills and splashes may cause residues to
form on the component cases. Use a squirt bottle and soapy water to
wash down the outer cases of the instruments. The instruments are
resistant to spills. However, unplug first, and take care to prevent water
from entering the vents.
Optics module: Clean the outside surfaces of the optics module as
described above. The 280 nm and 254 nm filters in the optics unit should
be cleaned only when necessary with a dry lens tissue and replaced in
the optics module. Use of a dilute ethanol or isopropanol solution will
assist in the removal of contaminants. When the optics module is not in
use, disconnect and clean out dissolved salts and protein from the flow
cell using a syringe filled with distilled water. Store the flow cell by
injecting a dilute solution (10-25%) of ethanol or isopropanol into the
cell to prevent microbial growth. Use the end caps provided to seal the
flow cell’s inlet and outlet lines. To prevent the formation of salt
crystals and solute deposits, do not allow the flow cell to dry out.
11
Avoid letting the flow cell become dry, as dissolved solids may pre-
cipitate and attach to the walls. This will result in baseline drift and possibly a noisy signal.
If the flow cell becomes dirty, it should be cleaned with an appropriate
solvent. (SDS, 1M HCl, 1M NaOH, ethanol, acetone, and methylene chloride will not harm Model EM-1 Econo UV Monitor flow cells.) If NaOH
is used, it should not be left in the flow cell for more than 20 minutes.
The control unit may be left on continually (power consumption is
negligible).
Section 8
Troubleshooting
Problem Possible cause Solution
Base line drift Bubbles in flow cell Clear by using pump
or purge mode, and internoisy signal mittently pinching the
outlet tubing, holding
momentarily, and
releasing.
Insure that flow
direction is correct.
Use degassed buffers.
Lamp not warmed up Wait 20 minutes
before use.
Filter tray is loose Adjust fixture screws;
Flow cell is loose these components
Case screws are loose should be snug, not
tight.
Dirty flow cell Clean flow cell; insure
that buffers are free of
particulate material.
Aging lamp Replace lamp (see
Appendix B). Note:
When using the 254 nm
filter, the lamp LED will
blink before baseline
becomes noisy.
12
13
Problem Possible cause Solution
Lamp will not Optics module not Plug optics module
light,or lamp LED plugged in into the socket
on continues blinking rear of UV monitor.
Lamp burned out Replace lamp (see
Appendix B).
Chart recorder Chart recorder is Plug chart recorder
not responding plugged into AUX into the socket.
socket
Full scale of recorder Set recorder range to
set too high 1 V.
Recorder has bottomed Readjust pen position.
out
Power adaptor not Check that recorder
plugged in power adaptor is
plugged in properly.
No power Faulty power Check power cable
connection connection.
Blown fuse Check fuses.
Appendix A
!
Flow Cell Replacement
1. Remove the retaining clip from the bottom of the optics module and
pull the luer connectors away from their holders as shown in Figure
A-1.
2. Unscrew thumbscrew and remove the old flow cell.
3. Reinsert the new flow cell following the above steps in reverse
order. (Do not over-tighten the thumb screw.)
Warning: To avoid exposure to UV radiation, make sure that the
UV lamp is off when changing filters and flow cells.
Retaining Clip
Luer Connectors
Thumbscrew
Flow Cell
Fig. A-1. Flow cell replacement.
14
15
Appendix B
UV Lamp Replacement
The coated low pressure mercury lamp has an expected lifetime of
at least 2,000 hours. To replace a lamp, proceed as follows, referring to
Figure B-1:
1. Unplug the optics module from the rear panel of the control unit.
Warning: Failure to unplug the optics module from the control unit
may expose the user to high voltage and UV radiation.
2. If the UV lamp has been on, allow the optics module to cool for 10
minutes before continuing.
3. Remove the filter tray (see Section 5.2) and the flow cell (see
Appendix A).
4. Remove the screws holding the optics module together and remove
the bottom half of the case.
5. Pull the old UV lamp out of its holder and unplug it from its
connector.
6. Plug the new UV lamp into its connector and insert it into the lamp
holder. Never handle the quartz surface of the UV lamp. Grease and
fingerprints will destroy the lamp.
7. Reassemble the optics module (do not over-tighten the screws).
!
Filter Tray
Lamp Connector
UV Lamp
Lamp Holder
Fig. B-1. UV lamp replacement.
16
Appendix C
Rear Panel Connections
Both the signal output and the AUX sockets are 8-pin circular
mini-DINs. The following information is provided for those wishing to
interface the Model EM-1 Econo UV Monitor with other equipment
such as integrators and non Bio-Rad fraction collectors. System Cable 7
may be used as a breakout cable, with an 8-pin mini-DIN at one end and
loose wires at the other.
Do not attempt to use the socket for anything other than the
Model EM-1 Econo UV Monitor optics unit.
All digital inputs use TTL circuitry and are active LOW.
Pin # Function Notes
1 Connects to Paper stop
AUX Pin 1
2 No Contact
3 No Contact
4 Integrator (+) 0 to 1 V = 0 to 2 AU
5 Chart Recorder (+) 0 to 1 V = Full scale
6 Connects to Pen down
AUX Pin 6
pin
configuration
7 Ground
8 No Contact
pin
configuration
Pin # Function Notes
1 Connects to
Pin 1
2 Auto-Zero
3 Large Mark Marks chart recorder
signal only
4 Integrator (+) 0 to 1 V = 0 to 2 AU
5 No Contact
6 Connects to
Pin 6
7 Ground
8 Small Mark Marks chart recorder
signal only
17
18
Appendix D
Technical Specifications
Wave length 254 nm and 280 nm
Operating mode AU
Lamp Low pressure mercury lamp with phosphor
screen
Filters Interference type
280 nm
254 nm
Operating temperature +4° to 40° C
Baseline offset ± 0.25 AU Auto-Zero
Time constant 1.5 sec to 90% of full response at all ranges
Sensitivity ranges 2.0, 1.0, 0.5, 0.2, 0.1, 0.05, 0.02, 0.01 AUFS
Output signal 0-1 V, impedance 150 ohms
Power requirements 90-132 VAC (120 V at delivery)
180-265 VAC (220 V at delivery)
Power consumption 15 watts
Dimensions Base unit 14.55 x 18.64 x 20.24 cm
(W x H x D)
Optics unit 13.21 x 15.24 x 3.81 cm
(W x L x H)
Weight Base unit 2.2 kg (4.8 lb)
Optical unit 311 g (11 oz)
Flow cell Optical path 2 mm
Internal volume 80 µl
Illuminated volume 3 µl
Noise 1.0 x 10-4AU max peak to peak (dry cell)
2 x 10-4AU max peak to peak (flowing liq-
uid)
Linearity 3% to 2 AU at 254 nm
Long term drift < 1 mAU/hr-deg C
Warm-up time 1 hour to meet drift specification
Flow sensitivity <200 µAU/(ml/min)
Regulatory CSA: C22.2 No.151-M1986
Compliance: TÜV: EN61010-1: 1993
CE: EN55011:1991 Class A
EN50082-2: 1995
19
Appendix E
Product Information
Model EM-1 Econo UV Monitor
Catalog
Number Product Description
731-8160 Model EM-1 Econo UV Monitor, 110 V (USA power
cord), with starter fittings kit
731-8162 Model EM-1 Econo UV Monitor, 220 V (no power
cord), with starter fittings kit
731-8165 Model EM-1 Flow Cell
731-8166 Model EM-1 Lamp
731-8167 Model EM-1 Filter Assembly
731-8168 Model EM-1 Optics Module Assembly
Cables
731-8262 System Cable 2, 8-pin mini-DIN to 8-pin
standard DIN
731-8267 System Cable 7, 8-pin mini-DIN to bare wires
Tubing
731-8210 Silicone Tubing, 0.8 mm ID, 0.8 mm wall, 10 m
731-8211 Silicone Tubing, 1.6 mm ID, 0.8 mm wall, 10 m
731-8212 Silicone Tubing, 3.2 mm ID, 0.8 mm wall, 10 m
731-8214 Tygon Tubing, 0.8 mm ID, 0.8 mm wall, 10 m
731-8215 Tygon Tubing, 1.6 mm ID, 0.8 mm wall, 10 m
731-8207 PharMed Tubing, 0.8 mm ID, 1.0 mm wall, 10 m
731-8208 PharMed Tubing, 1.6 mm ID, 1.0 mm wall, 10 m
731-8209 PharMed Tubing, 3.2 mm ID, 1.0 mm wall, 10 m
Fittings
731-8220 Low Pressure Fittings Kit, includes over 17 different
fittings and stopcocks (250 fittings in all)
Tygon and PharMed are registered trademarks of the Norton Company.
S
cience
p
800
us
a
(01)
Canada
(
000
and
089 318 8
7
3300
ael
4
590 5200
03-58
ea
8
60
ca
co
52 5 53
e Netherlands
0666
64-9
30
095 979 98 00
590-5200
Sweden
d
06
9555
0800-181134
0
US/EG
A
Bio-R
ad
aboratories
L
Life
Grou
ulletin 0000
Web site www.bio-rad.com USA(800) 4BIORAD Australia 02 9914 2
tri
A
Finl
Hong Kong 852-2789Italy 34 91
Latin Ameri
Th
Rev
877 89 01
905) 712-2771 45 44 52-1
India Isr
0318-54
ia 7
46 (0)8-55 51 27 00 Switzerlan
Singapore65-2729877 Spain34-91-
11-6270 Kor
Mexi
1-717-
2-2-3473-44
4 2552 to 54
-4152280 Norway 47-23-38-41-
United Kingdom
00-000 0000 Sig 120
M7318160 Rev H
03 951 412
4-17
Loading...