Valco Instruments Co. Inc. 340-0X User manual
Valco Instruments Co. Inc.
Rev 9/13
Dynacalibrator
Model 340
Instruction Manual
Valco Instruments Co. Inc.
800 · 367· 8424 sales
713 · 688· 9345 tech
713 · 688· 8106 fax
VICI AG International
Schenkon, Switzerland
Int + 41 · 41 · 925· 6200 phone
Int + 41 · 41 · 925· 6201 fax
North America, South America, and Australia/Oceania contact: Europe, Asia, and Africa contact::
Manufactured by:
Valco Instruments Co. Inc.
8300 Waterbury
Houston,TX 77055
Attention
Radiant heat warning
Entanglement warning
Electrical warning
Symbols used in this document
Table of Contents
Introduction
General Description.......................................................................................................................... 1
Dynacal® Permeation Devices...................................................................................................... 1
How to Use This Manual.................................................................................................................. 1
Basic Design ........................................................................................................................................ 1
Options ................................................................................................................................................. 4
Input Configurations ............................................................................................................. 4
Rack Mount Options.............................................................................................................. 4
Special Customer Options................................................................................................... 4
Specifications...................................................................................................................................... 5
Getting Started ........................................................................................................................................... 6
Initial Receiving Inspection/Check.............................................................................................. 6
Unpacking the Dynacalibrator..................................................................................................... 6
Concealed Damage .......................................................................................................................... 7
Unit Location.......................................................................................................................................8
Permeation Device Conditioning................................................................................................ 8
Rear Panel Connections .................................................................................................................. 9
Supply Inlet............................................................................................................................... 9
Carrier/Dilution Inlets..........................................................................................................10
Bypass Loops..........................................................................................................................11
Stream, Span, and Zero Outlets .......................................................................................11
Overflow and Chamber Vents..........................................................................................11
Front Panel Controls and Indicators .........................................................................................12
Main Power Switch...............................................................................................................12
Heater Power Switch ...........................................................................................................12
Permeation Chamber..........................................................................................................12
Permeation Chamber Flowmeter ...................................................................................12
Temperature Readout and Controller...........................................................................12
Dilution Flow Control Valves.............................................................................................12
Dilution Flowmeters............................................................................................................12
Oven Temperature Limit Thermostat ............................................................................12
Mode Selector Switch and Indicators............................................................................13
Calculations................................................................................................................................................14
Initial Power Up.........................................................................................................................................15
Basic Connections...........................................................................................................................15
Remote Control Connections .....................................................................................................15
Chamber Temperature ..................................................................................................................15
Setting the Chamber Temperature Manually........................................................................16
Setting the Chamber Temperature Limit Switch .................................................................16
Setting the Chamber Temperature via Serial Port (RS-232).............................................17
Installing the Permeation Device(s)..........................................................................................17
Verifying Operation.................................................................................................................................18
Serial Port Communication ..................................................................................................................20
Setting Up Serial Communication via HyperTerminal®.....................................................20
Entering Commands ......................................................................................................................24
Analyzer Calibration................................................................................................................................25
Shutdown Procedure..............................................................................................................................26
Table of Contents (continued)
Advanced Theory of Operation...........................................................................................................27
Plumbing Configurations .............................................................................................................27
Configuration 0 .....................................................................................................................28
Configuration 1 .....................................................................................................................28
Configuration 2 .....................................................................................................................29
Configuration 3 .....................................................................................................................29
Configuration 4 .....................................................................................................................29
Configuration 5 .....................................................................................................................31
Electrical Description..............................................................................................................................32
Maintenance..............................................................................................................................................33
Instrument Inspection and Cleaning .......................................................................................33
Carrier Flow Rate Verification......................................................................................................34
Dilution Flowmeter Calibration..................................................................................................34
Chamber Temperature Calibration ...........................................................................................35
Troubleshooting.......................................................................................................................................36
Electrical Troubleshooting ...........................................................................................................36
Pneumatic Troubleshooting........................................................................................................36
Leak Detection.......................................................................................................................36
Fluid Method....................................................................................................................36
Component Isolation Method ...................................................................................37
Other Pneumatic Issues......................................................................................................38
Model Number Breakdown..................................................................................................................39
Warranty .....................................................................................................................................................40
If this equipment is used outside manufacturers’ specification the protection provided
by the equipment may be impaired.
1
Introduction
General Description
VICI Metronics Dynacalibrators®use Dynacal®permeation devices to generate
the precise gas concentrations necessary for calibrating air pollution analyzers,
monitors, and other instruments that measure gas concentrations in the parts-
per-million range and lower.
Dynacalibrators are available in three models, each with a large variety of
optional features to fit a wide range of calibration requirements. All critical
factors, such as permeation rates, gas flow rates, and permeation chamber
temperatures are calibrated against standards traceable to the National Institute
of Standards and Technologies.
Model 340 specifications are listed on page 5.
Dynacal Permeation Devices
Metronics Dynacal permeation devices are the simplest and most reliable
method for supplying a source of trace quantities of various gases.They can
accommodate virtually any requirement for generating low concentrations of
gases. Permeation rates from thousands of ng/min down to fractional parts of a
ng/min are possible.The devices can be supplied filled with any one of hundreds
of different compounds, both organic and inorganic.
How to Use This Manual
This manual provides installation, operation, and maintenance information for
all configurations of the Model 340. The identification tag on the rear panel of
every Dynacalibrator is stamped with the unit’s complete model number, which
reflects the exact unit configuration. A chart on the last page of the manual
explains the model numbers.
Basic Design
The Model 340 contains two calibrated gas regulating systems – the carrier system
and the dilution system. The fixed flow carrier gas system includes a permeation
chamber containing the permeation device. The temperature of the chamber,
which controls the permeation rate of the calibration gas from the permeation
device, is set and monitored at the front panel. The carrier stream is pumped
through the chamber to pick up the calibration gas and is then fed on to a mix-
ing tee. The chamber temperature is adjusted from 30°C (or 2°C above ambient,
whichever is higher) to 110°C.
The dilution gas stream flows through an adjustable valve and a flowmeter to
the mixing tee. Front panel access to the valve and flowmeter permits the user
to accurately set the dilution stream flow rate to the mixing tee, thereby setting
the concentration of calibration gas at the outlet port of the calibrator.
2
Introduction
As indicated in Figure 1, the carrier stream passes through scrubber #1 and
30-micron line filter LF1 to the differential pressure regulator DPR1. The scrubber
contains specially-activated charcoal designed for broad-based scrubbing action.
This scrubbing medium is particularly effective in removing sulfur dioxide and
other sulfur compounds.
The differential pressure regulator and carrier flow restrictor FR1 together
provide a highly stable carrier stream flow rate to the permeation chamber.
The standard carrier flow restrictor consists of a disk with a 0.006" diameter
orifice. The flow rate through the orifice is a function of the pressure differential
across it and this differential is maintained at 3.2 psi by DPR1.
The output of the permeation chamber is fed to a mixing tee, where the calibrat-
ed dilution stream is added to set the final concentration. The combined stream
is then fed through another tee to the rear panel overflow vent and span outlet.
Figure 1: Model 340 plumbing schematic
For those analyzers sensitive to sample feed pressure, the overflow vent dumps
excess calibration gas to ensure that the analyzers receive span gas at near at-
mospheric pressure. The overflow vent is usually left open, but can be plumbed
to an external exhaust point. Any exhaust plumbing must be sized so as not to
increase pressure into the analyzer under calibration.
Referring again to Figure 1, note that the dilution stream passes through
scrubber #2 and feeds into differential pressure regulator DPR2. The differential
pressure regulator maintains a fixed pressure differential across dilution flow
control valve FCV2 and dilution flowmeter FM2.
3
Introduction
The flow rate through the flowmeter needle valve is a function of the differential
pressure across it and the setting of the dilution flow control valve. This differen-
tial is maintained at 3.2 psi by DPR2. The needle valve is adjustable at the front
panel. The calibrated output of the dilution flowmeter mixes with the perme-
ation chamber output to provide the final output concentration.
When the non-pressurized internal pump option is included, the rear-panel zero
outlet port is internally connected to a passive scrubber which functions identi-
cally to those previously described. In operation, the zero outlet is plumbed
either to the analyzer sample intake port or to the zero air intake port, so that
analyzer suction provides flow through the scrubber.
The Model 340 features zero air capability for easy two-point calibration. It can
be remotely switched between the zero air and span output modes. A front
panel switch permits selection of the ZERO, SPAN, or REMOTE mode. In the ZERO
mode, a two position valve directs the permeation chamber output to an exhaust
vent. Only the dilution stream passes through the mixing tee to the outlet port,
permitting the analyzer to be calibrated at its zero point.
In the REMOTE mode, the Model 340 can be used to calibrate a remote analyzer
equipped with a separate calibrate input port and remote control capability.
Figure 2 illustrates this application. The calibrator is initially set up and plumbed
to the analyzer at the remote monitoring station. The operator may then periodi-
cally check the calibration of the analyzer by simply switching it to the calibrate
mode and selecting the ZERO and SPAN outputs of the calibrator, or the calibrator
may be automatically sequenced at fixed time intervals. The calibrator requires
only a single contact closure to switch between the two modes.
Figure 2: Model 340 in remote mode
4
Introduction
Options
The following paragraphs provide general information on each, with more
detailed information found in “Advanced Theory of Operation”on page 27.
Input Configurations
There are six different input plumbing configurations available. The units
may be equipped with or without an internal pump. Units without internal
pumps can be supplied with one or two gas supply inlet ports (carrier and
dilution). Models with pumps are available with gas stream bypasses for either
the dilution or carrier stream or both. (Units without internal pumps do not
require gas stream bypasses.) Those with internal pumps have a single inlet port
supplying the pump, the outlet of which is split into carrier and dilution streams.
The gas stream bypasses on these units are also downstream from the pump,
permitting the user to connect external scrubbers, driers, separate gas supplies,
etc. in either or both streams. All models are available with nominal maximum
flow capacities from 1 to 20 liters per minute.
Rack Mount Options
The standard Dynacalibrator is packaged in a free-standing case with carrying
handles, for bench use.The units may also be packaged for mounting in a
standard 19" equipment rack.
Special Customer Options
Special options, identified by the“S”at the end of the model number, are not
covered in this basic manual. If your Dynacalibrator is equipped with a special
option, the required additional information will be found on the Special Option
Sheets in the back of this manual.The Special Option Sheets carry the serial
number of the Dynacalibrator to which they apply.
5
Specifications
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Introduction
6
Getting Started
Every Dynacalibrator is completely calibrated, thoroughly tested and inspected,
and carefully packed prior to shipment.The carrier has assumed responsibility for
its safe delivery upon acceptance of the shipment.
Initial Receiving Inspection/Check
On receipt of your unit, before signing the waybill and releasing the carrier’s
agent, inspect the shipment for the following:
1. The number of cartons received tallies with that on the waybill.
2. The weight of the shipment agrees with that on the waybill.
3. There is no visible evidence of damage to the shipment or its containers.
Any discrepancies to the above must be clearly described on the waybill and
signed by the carrier’s agent. Failure to adequately describe such external
evidence of loss or damage may result in the carrier refusing to honor any
subsequent claim.
Unpacking the Dynacalibrator
After the initial receiving inspection and check, the Dynacalibrator may be
unpacked. A carefully sized and mated pair of shipping cartons have been
designed to ensure against any damage to the Dynacalibrator while it is in
transit. Use the following procedures to remove the instrument from the
packaging, referring to Figure 3 as necessary.
Save all the packing materials – both cartons, the eight
corner blocks, and the two inner carton supports – for any
future shipment of the Dynacalibrator.
1. Neatly slit the shipping tape along the edges of the flaps on the top of the
carton with a knife. Do not try to pull or tear the tape.
2. Open the outer carton and remove the four corner blocks on top of the inner
carton.
3. Neatly slit the shipping tape along the edges of the flaps on the top of the in-
ner carton with a knife. Take care to penetrate the tape with the knife only far
enough to cut it. The Dynacalibrator is directly beneath the flaps.
4. Carefully lift the Dynacalibrator out of the inner carton.
7
Concealed Damage
Concealed damage is damage which is not apparent until after the equipment
has been unpacked and examined or tested. In the event that concealed damage
is discovered, a written request for inspection must be forwarded to the carrier’s
agent within 15 days of the delivery date. All cartons and packing materials must
be kept intact for the inspection. Delay in submitting the inspection request or
destroying the packing materials may give grounds for refusal of any claim.
After inspection, the carrier’s agent will usually request the return of the
equipment to VICI for inspection and repair. When this work is completed,
the equipment will be returned to you with an invoice itemizing charges for
all repairs. This invoice will become part of your claim to the carrier.
In the case of shipments made F.O.B. destination,VICI will, at your request, handle
the filing of damage claims with the carrier provided an acceptable inspection
report from the carrier is furnished to VICI. If, however, the claim is disallowed
through no fault of VICI, repair charges will be billed directly to you.
You must unpack and fully inspect the equipment and
file a written request for inspection with the carrier within
15 days of delivery to ensure claim satisfaction in the event
of concealed damage.
Getting Started
Figure 3: Dynacalibrator packaging
§
8
Unit Location
In general, the Dynacalibrator should be as close as possible to the analyzer to be
calibrated, as long as:
• theambienttemperatureisatleast2°Cbelowtheselectedoperating
temperature of the permeation chamber.
• ambienttemperaturevariationsareminimal.
• exposuretoprecipitationandcondensationisminimized.
• ambientparticulatelevelsareminimal.
(In the event that dust is prevalent, the unit should be equipped with a
Metronics Particulate Filter Assembly.)
• airowaroundtheunit’scoolingventsandrearpanelfanintakeisnot
blocked or restricted, particularly for the rack-mounted units.
• itisonalevelsurface,topreventerrorsinowdeterminationcausedbya
non-vertical flowmeter
When the Dynacalibrator is installed in an instrument rack,
the user must make certain that the overall rack ventilation/
cooling is adequate.
A bench-mounted Dynacalibrator should be placed on a firm horizontal
surface – preferably the same surface as the analyzer to be calibrated. A rack-
mounted enclosure in a mobile installation (van, aircraft, etc.) requires additional
mechanical support between the rack and the rear of the enclosure.This addi-
tional support is not needed for slide-mounted enclosures.
Once the Dynacalibrator has been unpacked and a location selected, check
the packing slip included with the shipment to verify that all the ancillary parts
(forceps, etc.) are available. In the event of a discrepancy, please notify VICI
immediately.
Permeation Device Conditioning
Dynacal permeation devices must be conditioned prior to their use in the
Dynacalibrator. Proper conditioning ensures that the device performs at its
specified mass permeation rate and accuracy.
Conditioning is accomplished primarily by heating the device for a specified
time period in a temperature-controlled environment (at the intended operating
temperature ±1°C) through which there is a steady purge of dry gas at a
minimum of 80 cc/min.
Since conditioning for each specific device is a function of a variety of factors,
inflexible rules or recommendations cannot be included here. Contact VICI
Metronics for conditioning information for your permeation devices.
Getting Started
9
Rear Panel Connections
Remove all shipping caps and shipping plugs from the rear panel bulkhead
fittings. All these hardware items should be saved for reuse if the Dynacalibrator
must be stored or returned to VICI.
The connections available on the rear panel of the different models and
configurations are listed in Table 1. If a plumbing connection is required, the
block under the fitting heading is marked with an “X”; if the connection is
optional, the block is marked with an“O”; if there is no connection, the block
is blank.
Fitting locations are identical for all configurations. Fitting holes which are not
used are equipped with blank caps. All connections are clearly marked and
easily identified.
Model Inlets Outlets Bypasses Vents
Sample Supply Carrier Dilution Stream Span Zero Carrier Dilution Overflow Chamber
340-0X X X O O
340-1X X X X O O
340-2X O X O O
340-3X O O X X O O
340-4X O O X X O O
340-5X O O O X X X O O
340-0X-Z X X X O O
340-1X-Z X X X X O O
340-2X-Z O X X O O
340-3X-Z O O X X X O O
340-4X-Z O O X X X O O
340-5X-Z O O O X X X X O O
X = Required connection
O = Optional connection
blank = No connection
Supply Inlet
All Dynacalibrators except those with -1X input configurations (separate carrier
and dilution inlet ports) are equipped with a supply inlet fitting. Those with -0X
input configurations (no internal pump) must have the supply inlet connected
to an external pressurized source of carrier and dilution gas, such as an external
pump, a cylinder of compressed gas, etc.The most commonly used gas is dry air;
however, dry nitrogen or any other comparably inert gas including ambient air
may also be used.
The pressure of the external gas source connected to
the supply inlet must be at least 10 psig but no more
than 30 psig. High pressure pumps and gas cylinders are
potentially very dangerous. Extreme care must be exercised
when making or breaking connections between the Dyna-
calibrator and external gas sources.
Getting Started
Table 1: Dynacalibrator Model 340 rear panel connections
10
On all units with an internal pump, the supply inlet port is internally connected
directly to the suction side of the pump. Since the output of the pump is
equipped with a particulate filter and activated-charcoal scrubbers, the supply
inlet port should normally be left unconnected, completely open, and clear of any
obstructions, except as noted below for dusty environments.
If you need to alter the carrier and/or dilution streams by adding filters, scrubbers,
dehydrators, etc., the recommended method is to connect these components
in series with the bypass loops as described on the next page. If your unit is not
equipped with bypass loops, you must consider the following before altering the
stream into the supply inlet:
• Iftheunitordeviceconnectedtothesupplyinletportgeneratesagas-ow-
related pressure drop, thereby partially “starving”the pump (that is, increasing
the vacuum at the pump’s suction port), the maximum flow output capability
of the Dynacalibrator will likely be diminished.
• Iftheunitordeviceconnectedtothesupplyinletisequippedwithasupple-
mentary pump providing an altered gas flow to the Dynacalibrator pump’s
suction at a pressure greater than 0 psig, the life of the pump may be
decreased. Increasing the suction pressure of the Dynacalibrator pump
will not increase its output flow capability.
Whenever a Dynacalibrator is to be operated in an environment that has signifi-
cant concentrations of dust or other particulate matter, we recommend a VICI
Metronics Particulate Filter Assembly (PFA) connected to the supply inlet port.
The disposable filter inside the PFA has been selected for its very low pressure
drop. Use of a PFA will not diminish the output flow of the Dynacalibrator pump.
The disposable filter part number is FC.
VICI recommends that Dynacalibrators equipped with inter-
nal pumps be operated either with their SUPPLY INLET port
completely open and clear of obstructions or fitted with a
low pressure drop VICI Metronics Particulate Filter Assembly.
Carrier/Dilution Inlets
All Dynacalibrators with input configurations -1X, -3X, -4X and -5X have a carrier
inlet and/or a dilution inlet. The -1X configuration does not have an internal
pump, so a source of pressurized gas must be connected to its carrier inlet and
its dilution inlet. On the remaining three input configurations, these inlets are
part of the gas stream bypass loops, discussed in a later paragraph. However,
the bypass loops may be left disconnected, and since they are downstream from
the internal pump, external pressurized gas sources may be connected to the
dilution inlet and/or the carrier inlet. The most commonly used gas is dry air;
however, dry nitrogen or any other comparably inert gas including ambient air
may also be used.
CAUTION: Externally supplied pressurized gas sources MUST
be limited to a pressure range of 10 psig minimum to 16 psig
maximum at these inlets.
Getting Started
11
Bypass Loops
Only those Dynacalibrators with internal pumps are equipped with fittings for
bypass loops in either or both the carrier and dilution streams (input configura-
tions -3X, -4X and -5X). The fittings – labeled CARRIER OUTLET, CARRIER INLET,
DILUTION OUTLET, and DILUTION INLET – are downstream from the pump, so
the loops must be completed in order for the internal pump to be used . The
purpose of the loops is to expedite the installation of external filters, scrubbers,
dehydrators, etc. into the two internal streams before each is mixed with the
trace gas. All plumbing should be as short as possible, and the devices should
not restrict the flow in either stream below their normal operating rates. If a
separate gas supply is connected to either inlet, the input pressure should be
between 5 and 16 psig, and the companion outlet should be capped.
If external devices are not required, then the outlet ports must be directly
plumbed to their companion inlet ports.
Stream,Span,and Zero Outlets
Since the Model 340 can supply zero air as well as span gas from its primary outlet,
that outlet is labeled STREAM OUTLET. The stream outlet may be either perma-
nently plumbed to the calibrate input port of an analyzer or temporarily connected
to its sample input for calibration, depending on the capabilities of the analyzer.
NOTE: The span outlet port should be directly connected
to the analyzer input with a minimum length of tubing.
Altering the output stream in any manner may affect the
concentration of calibration gas in the stream.
The zero outlet port provides a scrubbed supply of ambient air for a zero point
calibration. Since it is not pressurized, the zero outlet requires suction from the
analyzer being calibrated.
Overflow and Chamber Vents
All Dynacalibrators include an overflow vent to dump excess calibration gas,
ensuring that analyzers sensitive to sample feed pressure receive zero and
span gas at near atmospheric pressure. The overflow vent is therefore usually
left open, or plumbed to an external exhaust point with large diameter tubing.
External devices (filters, etc.) or tubing with too small a diameter on the overflow
vent may cause an undesirable increase of pressure at the analyzer’s input.
The Model 340 is also equipped with a chamber vent. The chamber vent dumps
calibration gas from the permeation chamber when these models are in any
mode other than SPAN / SPAN 1 / SPAN 2. In the ZERO mode, the dilution stream
becomes the zero air supply.
Getting Started
12
Front Panel Controls and Indicators
The section entitled “Advanced Theory of Operation”beginning on page 27
includes more detailed information on the interrelation of the front-panel
controls and indicators with the internal pneumatic and electrical flow of
the units.
MAIN POWER switch, indicator, and circuit breaker
The push-button switch provides primary power to all circuits. The LED indica-
tor lights when main power is on. A 6 amp circuit breaker is installed in the main
primary power input line to all circuits.
HEATER POWER switch, indicator, and circuit breaker
The push-button switch provides primary power to the heater circuits when
the main power switch is on. The LED indicator lights when heater power is on.
A 4 amp circuit breaker is installed in the primary power line to the permeation
chamber heater circuits.
PERMEATION CHAMBER
This is the chamber which holds the permeation devices. A tool is provided to
rotate the panel lock screw 90° counterclockwise to unlock the cap.
PERMEATION CHAMBER FLOWMETER
A ball float and gauge in the carrier stream immediately preceding the chamber
indicates relative carrier flow. The actual carrier flow is set at the factory. Refer to
the calibration sheet at the back of the manual.
TEMPERATURE READOUT AND CONTROLLER
The front panel displays the current chamber temperature and the control
status of the instrument, indicated by the PNL and TMP lights. The chamber
temperature can be set manually through the controls on the front panel or
remotely through RS-232 communication. (Refer to the chapter entitled “Serial
Port Communications” on page 20). After a temperature set point is entered by
either method, it is written to memory so that after a power failure the unit will
return to the condition previously established.
DILUTION FLOW CONTROL VALVE
Turn the knob to adjust the flow rate of the dilution stream prior to mixing with
carrier and trace gas.
DILUTION FLOWMETER
The ball float and gauge indicate the relative dilution stream flow rate into the
mixing tee, as set by the dilution flow control knob. Factory calibrated flow rates
at integral float settings are provided at the rear of the manual.
OVEN TEMPERATURE UPPER LIMIT
A thermostat provides a safety shutoff at this user-defined setpoint, usually
5 - 10 degrees above the normal run temperature of the permeation device in
use. If the oven runs out of control and the temperature goes above this setting,
power to the oven heater is shut down and a“PFAIL” indication appears in the
temperature display window.
Getting Started
13
SHUTDOWN
30° 120°
.15
.10
.05
CHAMBER
FLOW
MODE CONTROL
REMOTESPANZERO
DYNACALIBRATOR
MODEL 340
PERMEATION CHAMBER
LOCK
TEMPERATURE °C
PNL TMP
SET
MAIN HEATER
Figure 4: Model 340 front panel controls and indicators
MODE SELECTOR switch and indicators
The three position switch selects the calibration mode. LEDs indicate the current
mode.
• ZERO:Thepermeationchamberoutputisdumpedoutthechambervent;
only the dilution stream exits through the stream outlet to the analyzer.
• SPAN:Thepermeationchamberoutputandthedilutionstreamaremixed
and fed through the stream outlet to the analyzer.
• REMOTE:UnitdefaultstotheZEROmode.Aremotecontactclosuretorear
panelterminalsCandV1willswitchtheunittotheSPANmode.
Getting Started
14
Calculations
Concentration of the permeant compound in the span outlet stream is inversely
proportional to the carrier flow rate through the chamber. It is determined using
the following equation:
ª §«
Where: K = 24.45 / molecular weight of gas
P = permeation rate in ng/min (information included with
the permeation device documentation)
F = Chamber carrier flow (ml/min)
If the permeation rate is known for some reference temperature, the rate at a
second temperature can be estimated as follows:
log P = log PO+ 0.034 (T - TO)
Where: PO= Permeation rate at reference temperature TO
P = New permeation rate at temperature T
Certified devices should be used only at the temperature
specified on the certificate.
Using any permeation device beyond its recommended tem-
perature range could result in the destruction of the device
by explosion and/or changes in the membrane characteris-
tics. If in doubt, contact VICI Metronics with the part number
of the device to determine its maximum temperature limit.
Sample Calculation
Given:
Permeation rate: 21,000 ng/min Cl2@ 30°C
Carrier flow: 500 ml/min
Then:
Concentration (ppm) = K * P
F
(0.346)(21,000)
500 = 14.5 ppm=
For zero reference measurement, remove the permeation device from the
chamber.
15
Initial Power-Up
Basic Connections
1. Plug the power cable from the main power connector on the rear panel of the
calibrator to a 110 VAC power source (220 VAC with Model 340-C).
2. If you do not have the pump option:
Connect the carrier gas source (50 psi maximum pressure) to the carrier inlet
on the rear panel.
If this is a dual inlet system:
Connect appropriate source gases to the carrier inlet and dilution gas inlet.
The source must be of sufficient capacity to flow the maximum LPM of the
sum of dilution and carrier combined on a single inlet system. The carrier
inlet source must be able to provide at least 500 SCCM, and the dilution inlet
must be able to source the maximum dilution flow, which may be as high as
20 SLPM.
3. Turn on the calibrator with the main power switch on the front panel. This
supplies the fans, the control valves, and the pump, if so equipped.
4. Turn on the heater switch on the front panel. The display on the permeation
chamber cover will display a boot sequence, followed by a display of the
actual temperature.
5. Connect the span outlet to your instrument.
Always leak check the entire instrument and all flow connec-
tions, particularly if toxic, corrosive, or flammable gas mixes
will be generated.
Use clean/dry air or N2to perform a pressure/decay test to
verify the leak integrity of the system before putting it into
service.
Remote Control Connections
When the front panel mode selector is in the REMOTE position, the operating
mode can be selected by providing contact closures between the two rear panel
remote control terminals, labeled C (common) and V1. The contact closures must
be capable of handling 24 VAC at 0.5 amps into an inductive load.
When C and VI are open, the Model 340 is in the ZERO mode. When V1 is closed
to C, the unit switches to the SPAN mode.
Chamber Temperature
Important Chamber Temperature Considerations
• Ifthechambertemperatureexceedsthevaluesetbythemechanical
temperature limit switch, the heater will automatically shut down and
a warning screen will appear on the touch screen controller.
• henthefrontpaneldoorisremoved,theheaterautomaticallyshutsdown.
• Alwaysrefertotheseparateinstructionsaccompanyingthepermeation
tube(s) to make sure that the selected temperature is compatible with the
permeation tube(s) being used.
16
The front panel displays the current chamber temperature and the control status
of the instrument,indicated by the PNL and TMP lights. (Refer to Figure 4 on page 13.)
The chamber temperature can be set manually through the controls on the front
panel or remotely through RS-232 communication. (Refer to the chapter entitled
“Serial Port Communications” on page 20). After a temperature set point is entered
by either method, it is written to memory so that after a power failure the unit
will return to the condition previously established.
Setting the Chamber Temperature Manually
To read the current set point: press and hold the button.
To read the chassis environment temperature: press and hold the button.
1. To set the desired temperature, simultaneously press the and buttons,
then release them. The PNL light will start flashing, indicating the controller is
in the temperature set mode.
2. Use the and buttons to reach the desired temperature set point.
NOTE: Maximum temperature set point is 110°C; minimum is 30°C.
3. To enter or register the desired temperature set point, simultaneously press
the and buttons, then release them. The PNL light will stop flashing. If
the set point is not entered, after two minutes the controller will ignore the
temperature in Step 2 and revert to its previous status.
To prevent the set point from being accidentally changed, the front panel
controls can be disabled with a serial command. (Refer to the section entitled
“Serial Port Communications” on page 20.)
Setting the Oven Temperature Limit
A mechanical thermostat is integrated with the temperature control circuit
for fail-safe temperature control. This thermostat should be used to prevent
accidental overheating of low temperature permeation devices or permeation
devices containing toxic or hazardous chemicals. Overheating can rupture the
device or cause an unintended release of chemicals.
The temperature markings on the front panel are approximate (±10°C). For a
more accurate setting:
1. Using a flat-tipped screw driver or the tool provided, adjust the setting all the
way clockwise.
2. Turn on the Dynacalibrator main power and heater power. Do not install any
permeation devices yet.
3. Set the chamber temperature 5°C higher than the desired operating
temperature, and wait for temperature equilibrium.
4. After equilibrium, slowly rotate the limit switch counterclockwise until the
display reads“PFAIL”. (You may hear a faint click.)
5. Turn off the heater power switch and wait 15-20 minutes for the chamber to cool.
6. Turn on the heater power switch and set the chamber operating temperature.
When PFAIL occurs, the Dynacalibrator must be turned off
long enough for the chamber to cool before the power is
turned back on.
Initial Power-Up
This manual suits for next models
11
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