Hach Ultra MET ONE User manual
Operator Manual
High Pressure Diffuser
KSS - February 2006 - Edition 2
High Pressure Diffuser - Table of Contents 1 of 26
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Operator Manual
Table of Contents
1 Introduction
1.1 Overview..................................................................................................5
1.2 Unpacking and Initial Inspection..............................................................5
2 Installation and Cleaning
2.1 Installation................................................................................................7
2.1.1 Gasket Replacement..................................................................7
2.1.2 Diffuser Installation to CNC ........................................................8
2.1.3 Diffuser Installation to Particle Counter ......................................9
2.2 Cleaning.................................................................................................10
Appendix A: Service Procedures
A.1 Return Procedures.................................................................................13
A.2 Technical Support Information...............................................................13
Appendix B: Specifications and Technical Data
B.1 Specifications.........................................................................................15
B.2 Pressure/Flow Curves............................................................................15
B.2.1 Curve for 0.05 CFM Counters...................................................16
B.2.2 Curve for 0.1 CFM Counters.....................................................16
B.2.3 Curve For 1.0 CFM and 50 L/min Counters..............................17
B.2.4 Curve For 2.0 CFM Counters ...................................................17
Appendix C: WEEE Statement
C.1 Overview................................................................................................19
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Manual Overview
About This Manual
The information in this manual has been carefully checked and is believed to be accurate.
However, Hach Ultra assumes no responsibility for any inaccuracies that may be contained in
this manual. In no event will Hach Ultra be liable for direct, indirect, special, incidental, or
consequential damages resulting from any defect or omission in this manual, even if advised of
the possibility of such damages. In the interest of continued product development, Hach Ultra
reserves the right to make improvements in this manual and the products it describes at any
time, without notice or obligation.
Published in the United States of America
Hach Ultra P/N: 701083 Edition 2, February 2006
Copyright © 1992, 2006 by Hach Ultra Analytics, Inc.
All rights reserved. No part of the contents of this manual may be reproduced or transmitted in
any form or by any means without the written permission of Hach Ultra.
Safety Conventions
WARNING
A warning is used to indicate a condition which, if not met, could cause serious personal injury
and/or death. Do not move beyond a warning until all conditions have been met.
CAUTION:
A caution is used to indicate a condition which, if not met, could cause damage to the
equipment. Do not move beyond a caution until all conditions have been met.
N
o
t
e:
A note is used to indicate important information or instructions that should be considered
before operating the equipment.
Revision History
• Edition 2, Hach Ultra, February 2006.
• Edition A, Pacific Scientific Instruments, November 1992.
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Operator Manual
1 Introduction
1.1 Overview
This manual describes how to install and clean the high pressure diffuser. The high pressure
diffuser is an accessory that permits direct particle sampling of pressurized air, nitrogen, and
inert gases. By means of flow control orifices, pressures as high as 150 psi are reduced to
atmospheric pressure at the diffuser outlet. This allows the particle counter to count particles
while maintaining its calibrated airflow rate. The diffuser can be ordered at any time.
1.2 Unpacking and Initial Inspection
The high pressure diffuser is thoroughly inspected and tested at the factory. When the diffuser
is received, inspect the shipping carton for damage. If the carton is damaged, notify the carrier
and save the carton for carrier inspection. Inspect the diffuser for broken parts, scratches,
dents, or other damage.
Fig 1-1 : High Pressure Diffuser
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2 Installation and Cleaning
2.1 Installation
The high pressure diffuser has been equipped with an orifice that produces a flow rate equal to
the flow rate through the particle counter. For additional information on other orifices, contact
Hach Ultra on 800.866.7889 or +1 541.472.6500. The orifice has been installed in the inlet or
“PRESSURE” side of the diffuser.
Several types of fittings exist for connecting the diffuser to the particle counting device. The
correct fitting is supplied for the application. Two fittings are shown in the following procedure.
2.1.1 Gasket Replacement
CAUTION:
Do not reuse a gasket as the gasket loses its ability to seal after the first compression.
Each time a fitting is removed from the installation, the internal gasket (part number 590831)
should be replaced. Remove the old gasket from the gasket retainer and insert the new gasket
as shown in Figure 2-1 or Figure 2-2 whichever is applicable. The gasket may instead be
placed on the #4 VCR fitting.
Fig 2-1 : Gasket Replacement: CNC Users
Fig 2-2 : Gasket Replacement: Particle Counter Users
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2.1.2 Diffuser Installation to CNC
If the counting device is a condensation nucleus counter (CNC), install the high pressure
diffuser by following the procedure and Figure 2-3 below.
1) Turn the CNC power on; allow the CNC to warm up for 10 minutes before using.
2) Verify gaskets to the VCR fittings are new (flat surface, no indentation). To replace
gaskets refer to “Gasket Replacement” on the previous page.
3) Using proper hardware, attach a pressurized air line (150 psi maximum) to the orifice
(#4 VCR fitting) at the “PRESSURE” end of the diffuser.
4) Screw one end of the VCR close-coupling fitting onto the sample tube (#4 VCR fitting),
tighten fitting finger-tight.
5) While holding the sample tube nut with a wrench, tighten the nut on the VCR close-
coupling fitting 1/8 of a turn past finger-tight.
6) Repeat step 4 and step 5 above to attach the other end of the VCR close-coupling
fitting to the CNC rear panel INPUT fitting.
7) (Optional) To vent gases away from the working area, insert into the exhaust port the
hardware for venting to an environmentally safe ventilation system.
CAUTION:
To prevent contamination from entering the diffuser and CNC through the diffuser exhaust
port, never begin a count cycle before applying pressure to the diffuser.
8) Pressurize the sample input line then begin a run cycle. Refer to the CNC Operation
Manual for CNC operating instructions.
Fig 2-3 : Diffuser Installation to CNC
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2.1.3 Diffuser Installation to Particle Counter
Install the high pressure diffuser to the particle counter by following the procedure and
Figure 2-4 below. If the counter has a 1/8” inlet tube, use a 1/4” to 1/8” tubing reducer.
1) Verify the gasket in the VCR tube adapter is new (flat surface, no indentation). To
replace the gasket refer to “Gasket Replacement” on page 7.
2) Using proper hardware, attach a pressurized air line (150 psi maximum) to the orifice
(#4 VCR fitting) at the “PRESSURE” end of the diffuser.
3) Screw one end of the VCR tube adapter onto the sample tube (#4 VCR fitting), tighten
the nut on the VCR tube adapter finger-tight.
4) While holding the sample tube nut with a wrench, tighten the nut on the VCR tube
adapter 1/8 of a turn past finger-tight.
5) Attach tubing from the VCR tube adapter to the particle counter inlet tube. If the inlet
tube on the counter requires 1/8” tubing, insert a tubing reducer in the line.
6) (Optional) To vent gases away from the working area, insert into the exhaust port the
hardware for venting to an environmentally safe ventilation system.
CAUTION:
To prevent contamination from entering the diffuser and particle counter through the diffuser
exhaust port, never begin a count cycle before applying pressure to the diffuser.
7) Pressurize the sample input line then turn the particle counter on.
Fig 2-4 : Diffuser Installation to Particle Counter
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2.2 Cleaning
Particles cannot be generated by the diffuser; however, the diffuser can become contaminated
with particles if:
• used or stored in an uncontrolled environment
• the sample air is extremely contaminated.
If it seems the diffuser may be contributing to particle counts, clean it by following the procedure
and Figure 2-5 below.
Cleaning requires an ultrasonic bath of clean deionized water. For best results, do all
disassembly and assembly of the diffuser on a unidirectional-flow clean bench.
Part numbers for the o-rings are listed in Table 2-1. These part numbers are listed left to right
as they appear in Figure 2-5. Replace o-rings every time the unit is cleaned.
Clean the high pressure diffuser as follows:
1) Disconnect the diffuser from the high pressure line by removing both inlet and outlet
tubing from the diffuser.
2) Remove the orifice from the inlet end of the diffuser and remove the sample tube from
the outlet end of the diffuser.
3) Unscrew the inlet end from the diffuser body; remove the o-ring from the inlet end.
4) Unscrew the outlet end from the body of the diffuser; remove the o-ring from the body.
5) Spray all parts under a unidirectional-flow clean hood with solvent and flux-remover.
Fig 2-5 : Cleaning the Diffuser
Table 2-1 : O-Ring Part Numbers
Part Number Parts Connected
720020 Orifice to inlet
720078 Inlet to body
720093 Body to outlet
720050 Outlet to sample tube
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6) Place all parts except the body (muffler) in an ultrasonic bath of clean deionized water
(under a clean hood) for 15 minutes.
7) Remove parts from the ultrasonic bath; allow cleaned parts to dry in a clean
environment such as a unidirectional-flow clean hood. A general purpose pressurized
duster (filtered to < 0.5 micron) may, instead, be used for drying parts.
8) For ease of assembly, place the o-rings onto the parts as shown above, then coat the
o-rings with a thin layer of Dow Corning high vacuum grease.
9) To reassemble the diffuser, repeat step 1 through step 4 above in reverse order.
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Appendix A: Service Procedures
A.1 Return Procedures
To return the High Pressure Diffuser for repair, first obtain a returned material authorization
number (RA#). The RA# is necessary for any instrument that requires repair or calibration by
an authorized service center. Include the RA# on the shipping label when the instrument is
returned.
For the most up-to-date RA# process information, including copies of all required forms, call
Hach Ultra at 800.866.7889 or +1 541.472.6500.
To return an instrument for credit, please contact the local sales representative.
A.2 Technical Support Information
Technical Support Engineers are available to provide advice and recommendations for
applications, product operation, measurement specifications, hardware and software, factory
and customer site training.
Pleaseprovidename, company, phonenumber,faxnumber,model number,serial number and
comment or question.
Call +1 541.472.6500
Toll Free 800.866.7889 (US/CA)
Fax +1 (541) 474-7414
6:30 AM to 5:00 PM Pacific Time
Monday through Friday
Email: [email protected]
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Appendix B: Specifications and Technical Data
B.1 Specifications
B.2 Pressure/Flow Curves
With the curves on the following pages, determine what flow rate will appear at the input to the
diffuser when the gas is at a specific pressure. They provide the relationship of total flow rate
change to pressure change and they show how the flow rate increases with increasing
pressure. The curves also show how much gas will be used.
The orifice placed in the inlet VCR fitting regulates the gas velocity inside the diffuser. The size
of the orifice (stamped on the fitting) is determined by the airflow rate of the particle counter (or
CNC) and is given on each flow curve below. The isokinetic point on each curve is the location
where velocity in the sample tube (flow to counter) is equal to the velocity around the sample
tube (flow to exhaust port). Total flow rate equals the flow rate into the counter (always
constant) plus flow rate out of the exhaust port (increases as pressure increases).
The following curves are based on air samples at pressures from 30 psi to 150 psi. The curves
also apply to nitrogen. For curves on other gases, contact Hach Ultra on 800.866.7889 or
+1 541.472.6500.
Sample Gas Pressure Range 30-150 psig or
50-150 psig (for 50 L/min diffuser)
Sample Flow Rate 0.05 CFM, 0.1 CFM, 1.0 CFM, 2.0 CFM, or 50 L/min
Sample Gas Dry, inert, non-toxic
Pressure Line Connector Stainless #4 VCR fitting (modified)
Outlet Flow Connector Stainless #4 VCR fitting (modified) or
½-inch barb fitting for 50 L/min diffuser
Exhaust Port ¼-inch NPT
Orifice Material Sapphire
Dimensions 19.1 cm long x 5.7 cm diameter (7.5 x 2.25 in.)
Weight 0.57 kg (1.25 lbs)
Material Nickel-plated aluminum, stainless steel
Table of contents
