Hach Ultra MET ONE 227 User manual

701094
MET ONE 227
Particle Counter
USER MANUAL
May 2008, Edition 6
Test Equipment Depot - 800.517.8431 - 99 Washington Street Melrose, MA 02176 - TestEquipmentDepot.com

701094
MET ONE 227
Particle Detector
USER MANUAL
May 2008, Edition 6
© Hach Ultra Analytics, Inc., 2008. All rights reserved. Printed in the U.S.A.

3
Table of Contents
Section 1 Specifications....................................................................................................................5
Section 2 General Information.........................................................................................................7
2.1 Safety information........................................................................................................................7
2.1.1 Use of hazard information...................................................................................................7
2.1.2 Precautionary labels ...........................................................................................................7
2.1.3 Laser safety information...................................................................................................... 8
2.1.4 Battery safety information...................................................................................................8
2.1.5 Electrostatic discharge (ESD) considerations.....................................................................8
2.2 General product information ........................................................................................................9
2.3 Theory of operation......................................................................................................................9
Section 3 Installation........................................................................................................................11
3.1 Unpack the instrument...............................................................................................................11
3.2 Installation guidelines for the MET ONE 227 particle counter ...................................................11
3.3 Mechanical installation...............................................................................................................12
3.3.1 Install the isokinetic probe.................................................................................................12
3.3.2 Install the purge filter.........................................................................................................12
3.3.3 Install the charging stand..................................................................................................13
3.3.4 Connect the AC adapter ...................................................................................................13
3.3.5 Install the RH/T probe.......................................................................................................13
3.4 Connections and adjustments....................................................................................................13
Section 4 Operation..........................................................................................................................15
4.1 Power up....................................................................................................................................15
4.2 Factory default settings..............................................................................................................15
4.3 Manual mode.............................................................................................................................15
4.4 Automatic mode.........................................................................................................................16
4.4.1 Unlock the program mode.................................................................................................19
4.4.2 Set display (DSP) functions..............................................................................................19
4.4.3 Set serial input/output (SIO) functions..............................................................................21
4.4.4 Set clock (CLK) functions..................................................................................................21
4.5 Average mode............................................................................................................................23
4.6 Concentration mode...................................................................................................................24
4.7 Beep mode.................................................................................................................................26
4.8 Program the temperature probe.................................................................................................28
Section 5 Maintenance ....................................................................................................................29
5.1 Maintenance guidelines.............................................................................................................29
5.2 Clean the sensor........................................................................................................................29
Section 6 Troubleshooting .............................................................................................................31
6.1 Common problems.....................................................................................................................31
6.2 Reset the counter.......................................................................................................................31
6.3 Troubleshoot the pump..............................................................................................................32
6.3.1 Disassemble and clean the pump.....................................................................................32
6.3.2 Optimize the pump............................................................................................................35
Section 7 Replacement Parts and Accessories.........................................................................37
7.1 Accessories................................................................................................................................37
7.2 Optional accessories..................................................................................................................37
Section 8 Service Contact Information........................................................................................39
Section 9 Limited Warranty ............................................................................................................40
Section 10 Certification...................................................................................................................41

4
Table of Contents
Appendix A Computer Interface Operations ..............................................................................43
A.1 Data analysis for ISO 14644......................................................................................................43
A.1.1 Computer communications ...............................................................................................43
Appendix B PortAll Software..........................................................................................................47
B.1 Connections...............................................................................................................................47
B.2 Operation...................................................................................................................................47
Appendix C DPU-414 Printer ..........................................................................................................49
C.1 Printer setup ..............................................................................................................................49
C.2 Counter setup for the printer......................................................................................................51
C.3 Interpret the printout ..................................................................................................................52
Index......................................................................................................................................................53

5
Section 1 Specifications
Specifications are subject to change without notice.
General
Dimension (W x H x L) 101.60 mm x 58.42 mm x 165.10 mm (4.0" x 2.3" x 6.5")
Weight 1 kg (2.13 lb)
Maximum count displayed 9,999,999
Sample flow rate 0.1 cfm
Number of size ranges 2 (second size range can be selected at the front panel)
Particle size ranges
MET ONE 227A—0.5 micron and larger (channel 1); 0.7 micron, 1 micron, 3
micron or 5 micron (channel 2)
MET ONE 227B—0.3 micron and larger (channel 1); 0.5 micron, 1 micron, 3
micron or 5 micron (channel 2)
Coincidence error Less than 5% at 2,000,000 particles/cubic foot
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 200 samples, rotating buffer
Count cycles Up to 100 in Auto or Average mode
Locations Up to 250 (number appears on the printout)
Output RS232C/RS485 for computer
Pump type Carbon vane, 0.1 cfm
Recharging time Up to 90% in 10 hours, 100% in 12 hours
Battery type Rechargeable NiMH, 3500 mAH
Operating time 8 hours, typical
Environment
Operating temperature 12 to 29 °C (55 to 84 °F)
Operating humidity 10 to 85% relative humidity, non-condensing
Storage temperature -40 to 71 °C (-40 to 160 °F)
Storage humidity Up to 98% relative humidity, non-condensing

6
Specifications

7
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, indicates the presence of devices sensitive to Electro-static Discharge
(ESD) and indicated that care must be taken to prevent damage with the equipment.

8
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. Only factory-authorized personnel must perform the service.
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 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.
2.1.5 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 the user to take the following steps to prevent ESD
damage to the instrument:
•Before the user touches 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.
Figure 1 Battery safety label

9
General Information
2.2 General product information
The MET ONE 227 particle counter is a battery operated, laser based particle counter
that is used in a walk-around sampling routine. The MET ONE 227 particle counter stores
up to 200 records with a different location label for each sample. The data records may
later be printed or downloaded to a computer for analysis. The MET ONE 227 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
assemblies, computer rooms and downstream of air filter installations in HVAC systems.
The Concentration mode in the MET ONE 227 particle counter is used to take a brief
sample and estimate the probable cleanliness in areas with unknown particulate levels.
This is based on built-in calculations performed in the microprocessor of the MET ONE
227 particle counter. Long term use of the MET ONE 227 particle counter in uncontrolled
environments such as open air office spaces or outdoor air will require frequent sensor
maintenance.
The MET ONE 227 particle counter operates at a flow rate of 0.1 cubic foot per
minute (cfm). The flow rate is required to set the sampling parameters. For instance, the
MET ONE 227 particle counter takes 10 minutes to sample 1 cubic foot of air. To obtain
the counts per cubic foot, multiply the results of a 1-minute sample by ten. All counts are
reported as cumulative counts; that is, all the reported 0.3 micron particles are 0.3 micron
and larger in size.
2.3 Theory of operation
The MET ONE 227A/B particle counter is a combination of a sensor, pump and
electronics (refer to Figure 2 on page 10) that includes full particle counter features. Both
variants use the same sensor, pump, CPU and display electronics. The MET ONE 227A
particle counter is calibrated with channel 1 sensitivity of 0.5 micron and the MET ONE
227B particle counter is calibrated with a channel 1 sensitivity of 0.3 micron. Both operate
at a flow rate of 0.1 cfm.
The sample passes through a laser beam in the sensor, where the particles scatter the
laser light. The sample then passes through a pump and a filter to trap particles in the
counter rather than return them to the environment. The flashes of scattered light are
converted to electronic pulses directly proportional to the amount of scatter, which
creates a correlation to the particle size. The electronic pulses are counted and stored in
channel bins in a data record. A data record also includes the date and time from the
CPU clock and snapshots of the environmental conditions, if the Relative
Humidity/Temperature (RH/T) probe is attached.