Hach Ultra MET ONE 237AB User manual

701076
MET ONE 237AB Particle Detector
USER MANUAL
June 2008, Edition 5

701076
MET ONE 237AB Particle Detector
USER MANUAL
June 2008, Edition 5
© Hach Ultra Analytics, Inc., 2008. All rights reserved. Printed in the U.S.A.

1
Table of Contents
Section 1 Specifications.................................................................................................................... 3
Section 2 General Information......................................................................................................... 5
2.1 Safety information........................................................................................................................ 5
2.1.1 Use of hazard information................................................................................................... 5
2.1.2 Precautionary labels ........................................................................................................... 5
2.1.3 Laser safety information...................................................................................................... 6
2.1.4 Electrostatic discharge (ESD) considerations..................................................................... 6
2.1.5 Battery safety information ................................................................................................... 6
2.2 General product information ........................................................................................................ 7
2.3 Theory of operation...................................................................................................................... 8
Section 3 Installation.......................................................................................................................... 9
3.1 Unpack the instrument................................................................................................................. 9
3.2 Mechanical installation............................................................................................................... 10
3.2.1 Install the isokinetic probe................................................................................................. 10
3.2.2 Install the purge filter......................................................................................................... 11
3.2.3 Load printer paper............................................................................................................. 11
3.2.4 Connect the AC adapter ................................................................................................... 12
3.2.5 Install the RH/T probe ....................................................................................................... 12
3.3 Rear panel connections ............................................................................................................. 12
Section 4 System Start Up .............................................................................................................. 13
4.1 Power up.................................................................................................................................... 13
Section 5 Operation.......................................................................................................................... 15
5.1 Front panel overview.................................................................................................................. 15
5.2 Setup.......................................................................................................................................... 16
5.3 Counting modes......................................................................................................................... 16
5.3.1 Manual mode .................................................................................................................... 16
5.3.2 Automatic mode ................................................................................................................ 19
5.3.3 Concentration mode.......................................................................................................... 21
5.3.4 Beep mode........................................................................................................................ 23
5.4 Program the relative humidity and temperature probe (RH/T)................................................... 23
5.4.1 Environmental alarms .......................................................................................................24
Section 6 Maintenance .................................................................................................................... 25
6.1 Maintenance guidelines ............................................................................................................. 25
6.2 Clean the sensor........................................................................................................................ 25
6.2.1 Battery replacement.......................................................................................................... 26
6.3 Printer maintenance................................................................................................................... 26
6.3.1 Clean the print head.......................................................................................................... 26
6.3.2 Correct light print............................................................................................................... 26
6.3.3 Replace the printer ribbon.................................................................................................27
Section 7 Troubleshooting Procedures....................................................................................... 29
7.1 Common problems..................................................................................................................... 29
7.2 Reset the counter....................................................................................................................... 29
7.3 Pump troubleshooting................................................................................................................ 30
7.3.1 Disassembly and cleaning of the pump ............................................................................ 30
7.3.2 Pump optimization ............................................................................................................ 32
Section 8 Replacement Parts and Accessories......................................................................... 33
8.1 Accessories................................................................................................................................ 33
Section 9 Service Contact Information ........................................................................................ 35
Section 10 Limited Warranty .......................................................................................................... 37

2
Table of Contents
Section 11 Certification....................................................................................................................39
Appendix A Optional Accessories ................................................................................................41
A.1 Relative humidity/Temperature (RH/T) probe............................................................................41
A.2 High-pressure diffuser................................................................................................................41
A.3 RS485 converter ........................................................................................................................41
A.4 External printer...........................................................................................................................42
A.5 PortAll software..........................................................................................................................42
A.6 Carrying case.............................................................................................................................42
Appendix B Computer Interface Operations ..............................................................................43
B.1 Data analysis for ISO 14644......................................................................................................43
B.1.1 Computer communications ...............................................................................................43
Appendix C PortAll Software..........................................................................................................47
C.1 Connections...............................................................................................................................47
C.2 Operation ...................................................................................................................................47
Appendix D DPU–414 Printer..........................................................................................................49
D.1 Printer setup ..............................................................................................................................49
D.2 Counter setup for the printer......................................................................................................50

3
Section 1 Specifications
Specifications are subject to change without notice.
General
Size 170.94 mm x 58.42 mm x 165.10 mm (6.7" W x 4.5" H x 11.7" D)
Weight 3.0 kg (6.8 lb)
Maximum count displayed 9,999,999
Sample flow rate 0.1 cfm
Number of size ranges 2, 4, 5, 6 (specified at the time of order)
Particle size ranges
MET ONE 237A—0.5 and 5.0 micron (2 channel); 0.5, 0.7, 1.0 and 5.0 micron (4
channel); 0.5, 0.7, 1.0, 2.0 and 5.0 micron (5 channel); 0.5, 0.7, 1.0, 2.0, 3.0 and
5.0 micron (6 channel)
MET ONE 237B—0.3 and 5.0 micron (2 channel); 0.3, 0.5, 1.0 and 5.0 micron (4
channel); 0.3, 0.5, 0.7, 1.0 and 5.0 micron (5 channel); 0.3, 0.5, 0.7, 1.0, 2.0 and
5.0 micron (6 channel)
Coincidence error Less than 5% at 2,000,000 particles/cubic feet
Power +5 W, +10 V (approximately) (+6 V with battery pack)
Light source Laser diode
Sample/hold times 1 second to 24 hours
Count alarms 1 to 9,999,999 counts
Data storage 500 samples, rotating buffer
Count cycles Up to 100 in Auto mode
Locations Up to 250 (number appears on the printout)
Output RS232/RS485 for computer
Pump type Carbon-vane, 0.1 cfm
Battery type Rechargeable NiCd, 3500 mAH
Operation time 4 hours printing, 8 hours without printing
Environment
Operating temperature 2 to 29 °C (55 to 84 °F)
Operating humidity 10 to 85% relative, non-condensing
Storage temperature -40 to 71 °C (–40 to 160 °F)
Storage humidity Up to 98% relative, non-condensing

4
Specifications

5
Section 2 General Information
2.1 Safety information
Read this entire manual before unpacking, setting up or operating this equipment. Pay
attention to all danger and caution statements. Failure to do so could result in serious
injury to the operator or damage to the equipment.
To make sure that the protection provided by this equipment is not impaired, do not use
or install this equipment in any manner other than that specified in this manual.
2.1.1 Use of hazard information
DANGER
Indicates a potentially or imminently hazardous situation which, if not avoided, will
result in death or serious injury.
WARNING
Indicates a potentially or imminently hazardous situation which, if not avoided,
could result in death or serious injury.
CAUTION
Indicates a potentially hazardous situation that can result in minor or
moderate injury.
Important Note: Indicates a situation which, if not avoided, can cause damage to the
instrument. Information that requires special emphasis.
Note: Information that supplements points in the main text.
2.1.2 Precautionary labels
Read all labels and tags attached to the instrument. Personal injury or damage to the
instrument could occur if not observed. A symbol, if noted on the instrument, will be
included with a danger or caution statement in the manual.
This symbol, if noted on the instrument, references the instruction manual for operation and/or safety information.
Electrical equipment marked with this symbol cannot be disposed of in European public disposal systems after
12 August of 2005. In conformity with European local and national regulations (EU Directive 2002/96/EC),
European electrical equipment users must now return old or end-of life equipment to the Producer for disposal at no
charge to the user.
Note: To return for recycling, contact the equipment producer or supplier for instructions on how to return end-of-life
equipment, producer-supplied electrical accessories, and all auxiliary items for proper disposal.
This symbol, when noted on a product enclosure or barrier, indicates that a risk of electrical shock and/or
electrocution exists.
This symbol, if noted on the product, indicates the need for protective eye wear.
This symbol, when noted on the product, identifies the location of a fuse or current limiting device.
This symbol indicates a laser device is used in the equipment.
This symbol, when noted on the product, indicated the presence of devices sensitive to Electro-static Discharge
(ESD) and indicated that care must be taken to prevent damage with the equipment.

6
General Information
2.1.3 Laser safety information
This particle counter contains a laser-based sensor that is a Class 1 product (as defined
by 21 CFR, Subchapter J, of the Health and Safety Act of 1968) when used under normal
operation and maintenance. The manual contains no procedures for service of internal
parts within this unit. Service should be performed only by factory-authorized personnel.
The particle counter has been evaluated and tested in accordance with EN
61010-1:1993, "Safety Requirements For Electrical Equipment For Measurement,
Control, and Laboratory Use" and IEC 825—1:1993, "Safety of Laser Products".
2.1.4 Electrostatic discharge (ESD) considerations
Important Note: To minimize hazards and ESD risks, maintenance procedures not
requiring power to the analyzer should be performed with power removed.
Delicate internal electronic components can be damaged by static electricity, resulting in
degraded instrument performance or eventual failure.
The manufacturer recommends taking the following steps to prevent ESD damage to
the instrument:
•Before touching any instrument electronic components (such as printed circuit cards
and the components on them) discharge static electricity. This can be accomplished
by touching an earth-grounded metal surface such as the chassis of an instrument
or a metal conduit or pipe.
•To reduce static build-up, avoid excessive movement. Transport static-sensitive
components in anti-static containers or packaging.
•To discharge static electricity and keep it discharged, wear a wrist strap connected
by a wire to earth ground.
Handle all static-sensitive components in a static-safe area. If possible, use anti-static
floor pads and work bench pads.
2.1.5 Battery safety information
WARNING
An explosion can occur if the internal battery is replaced incorrectly.
Figure 1 shows the label that appears on the battery for the safety of the user.
Figure 1 Battery safety label

7
General Information
2.2 General product information
The MET ONE 237 particle counter is a battery operated, laser based particle counter
that is used in a walk-around sampling routine. The counter can store up to 500 records
for each sample with a different location label on the record. The data records may later
be printed or downloaded to a computer for analysis. The MET ONE 237 particle counter
is used in environments where the particulate contamination does not exceed two million
particles per cubic foot of air, such as clean-rooms, medical instrument assembly,
computer rooms. The Concentration mode in the MET ONE 227 particle counter is used
to take a brief sample and estimate the probable cleanliness for areas with unknown
particulate levels. This is based on built-in calculations performed in the microprocessor
of the counter. Long term use in uncontrolled environments such as open air office
spaces or outdoor air will require frequent user maintenance.
The MET ONE 237 particle counter operates at a flow rate of 0.1 cubic feet per minute
(cfm). The flow rate is required to set the sampling parameters. It takes 10 minutes to
sample one cubic foot of air while the results of a one minute sample is multiplied by ten
to obtain counts per cubic foot. All counts are reported as cumulative counts; that is, all
the reported 0.3 µm particles are 0.3 µm and larger in size.