Valco Instruments Co. Inc. 500 User manual
Valco Instruments Co. Inc.
9/13
Dynacalibrator
Model 500
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
Span and Zero Outlets.......................................................................................................... 9
Overflow Vent .......................................................................................................................... 9
Front Panel Controls and Indicators .........................................................................................10
Calculations................................................................................................................................................13
Initial Power Up.........................................................................................................................................14
Connections ......................................................................................................................................14
Chamber Temperature ..................................................................................................................14
Setting the Chamber Temperature Manually........................................................................15
Setting the Chamber Temperature Limit Switch .................................................................15
Setting the Chamber Temperature via Serial Port (RS-232) .............................................16
Installing the Permeation Device(s)..........................................................................................16
Serial Port Communication ..................................................................................................................17
Setting Up Serial Communication via HyperTerminal®.....................................................17
Entering Commands ......................................................................................................................21
Analyzer Calibration................................................................................................................................22
Shutdown Procedure..............................................................................................................................23
Advanced Theory of Operation...........................................................................................................24
Plumbing Configurations.............................................................................................................25
Configuration 0 .....................................................................................................................25
Configuration 1 .....................................................................................................................25
Table of Contents (continued)
Electrical Description..............................................................................................................................26
Maintenance..............................................................................................................................................27
Instrument Inspection and Cleaning .......................................................................................27
Carrier Flow Rate Verification......................................................................................................28
Dilution Flowmeter Calibration..................................................................................................28
Chamber Temperature Calibration ...........................................................................................29
Troubleshooting.......................................................................................................................................30
Electrical Troubleshooting ...........................................................................................................30
Pneumatic Troubleshooting........................................................................................................30
Leak Detection Fluid Method...........................................................................................30
Component Isolation Method .........................................................................................31
Model Number Breakdown..................................................................................................................32
Warranty .....................................................................................................................................................33
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 four 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 500 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 500. 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 500 contains three calibrated gas regulating systems – two carrier
systems and one dilution system. Each fixed flow carrier system includes a per-
meation chamber containing the permeation device. The temperature of each
chamber controls the permeation rate of the calibration gas from the perme-
ation device. Each chamber temperature is set and monitored at the front panel,
or remotely by serial communication. Each chamber temperature is adjustable
from 30°C (or 2°C above ambient, whichever is higher) to 110°C.
Each carrier stream can be selected independently, or both carriers can be added
together with the dilution stream. The dilution gas stream is pumped through
an adjustable valve and a flowmeter to the mixing tee for each carrier stream.
Front panel access to the valve and flowmeter permits the user to accurately
set the dilution stream flow rate that will be mixed with the selected carrier
stream(s), thereby controlling the concentration of the calibration gas available
at the outlet port of the calibrator
2
Introduction
As indicated in Figure 1, the carrier stream passes through scrubber #1 and
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 flow rate through the orifice is a function of the pressure differential across
it; this differential is maintained at 3.2 psi by DPR1.
Figure 1: Model 500 plumbing schematic
The output of the permeation chambers is fed forward to SV1 and SV2, respec-
tively. When the front panel switches are ON for SPAN 1 and/or SPAN 2, then the
respective carrier flows are routed through the valves’ C and NC ports and to the
mixing tee, where the calibrated dilution stream is added and mixed into it to set
the final concentration. When neither SPAN 1 nor SPAN 2 are selected, both SV1
and SV2 are de-energized, and the chamber output passes through its C and NO
ports to the chamber vent. The dilution stream alone then passes through the
mixing tee. The output of the mixing tee is split by another tee and fed to the
overflow vent and solenoid control valve SV3.
The overflow vent is usually left open, but can be plumbed to an external
exhaust port. Any exhaust plumbing must be sized so that it doesn’t cause any
increased pressure into the analyzer under calibration.
3
Introduction
Referring again to Figure 1, note that the dilution stream passes through
scrubber #3 and feeds into differential pressure regulator DPR3. The Model 500
contains a dilution flow control valve and rotometer, plus a rotometer for SPAN 1
and SPAN 2 carrier flows. When energized, solenoid control valve SV1 opens to
route carrier 1 flow to the mixing tee. Differential pressure regulator DPR1 main-
tains a fixed 3.2 psi pressure differential across the selected flow control valve
and meter. The flow rate through the selected flowmeter is then a function of this
fixed pressure differential and the carrier flow control orifice FR1. The desired
dilution flow, set using FCV2, is mixed with any selected permeation chamber
output to provide a final output concentration.
Figure 2: Model 500 output flow configurations
4
The Model 500 has four modes of operation – ZERO, SPAN 1, SPAN 2, and Both
SPAN 1 and SPAN 2. When the calibrator mode is changed to ZERO, SPAN 1, or
SPAN 2, a two position valve in the calibrator interrupts the sample input and
substitutes the calibrator output to the analyzer.
ZERO (neither SPAN 1 nor SPAN 2 on), SPAN 1, SPAN 2, and SPAN 1 + SPAN 2 can
provide three points of calibration along with a zero reference. The ZERO mode
vents the outputs from the permeation chamber through an exhaust port so that
only the dilution stream passes through the mixing tee to the stream outlet port
and into the analyzer for zero point calibration.
The SPAN 1 mode mixes the carrier stream with the dilution stream from a high-
flow control valve and flowmeter for low output concentrations of the trace
gas. In the SPAN 2 mode, a low-flow control valve and flowmeter are substituted
for the high flow components in the dilution stream to produce high output
concentrations of the trace gas. Front panel access to the control valves for each
of the two dilution flow-meters permits the user to accurately set both a low and
high output concentration and switch between them and zero air for the three-
point check.
Options
The following paragraphs provide general information on each, with more
detailed information found in “Advanced Theory of Operation” on page 24.
Input Configurations
The Dynacal 500 series is available with either single or dual gas supply. Both
plumbing configurations rely on external feed gas supplies and regulators. The
two gas inlet system allows for different gases to be used for carrier and dilutent.
Both systems 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.
Introduction
5
Introduction
Specifications
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.
4. Check the condition of the shock sensors on the sides of the box. If any
indicator is tripped please note this with the carrier immediately.
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
inner 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 con-
cealed damage.
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:
• the ambient temperature is at least 2°C below the selected operating
temperature of the permeation chamber.
• ambient temperature variations are minimal.
• exposure to precipitation and condensation is minimized.
• air flow around the unit’s cooling vents and rear panel fan intake is not
blocked or restricted, particularly for the rack-mounted units.
• it is on a level surface, to prevent errors in flow determination caused by a
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
Getting Started
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 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
500-0 X X X X
500-1 X X X X X
X = Required 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. The supply inlet
must be 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 25 psig.
High pressure pumps and gas cylinders are potentially very
dangerous. Extreme care must be exercised when making
or breaking connections between the Dynacalibrator and
external gas sources. A suitable relief valve and/or regulator
must be employed on all external sources.
If there is a need to condition the incoming external source of gas (external
pump or pressurized cylinder), the conditioning filters, scrubbers, dehydrators,
etc. should be placed on the supply stream before it is connected to the
Dynacalibrator inlet.
Table 1: Dynacalibrator Model 500 rear panel connections
10
Carrier/Dilution Inlets
All 500 Series Dynacalibrators are configured with either a single inlet (500-0-***)
or a dual inlet (500-1-***) and therefore require an external source of pressur-
ized gas. On dual inlet systems two different types of gas can be used – one for
dilution and one for carrier. 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 25 psig
maximum at these inlets.
Span and Zero Outlets
The primary outlet on the Model 500 is labeled SPAN OUTLET. The span outlet
may be either permanently 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.
Overflow Vent
All Dynacalibrators include an overflow vent to dump excess calibration gas,
ensuring that analyzers sensitive to sample feed pressure receive a supply from
the Dynacalibrator 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.
Getting Started
11
Front Panel Controls and Indicators
The section entitled “Advanced Theory of Operation”beginning on page 24
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.
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
Getting Started
Figure 4: Model 500 front panel controls and indicators
12
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 17). 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
Turning the knob on the Dilution Flow Control Valve clockwise will increase the
diluent flow that will mix with any selected carrier flow. If neither Span 1 nor
Span 2 are selected, this flow will act as a Zero gas at the SPAN OUTLET.
DILUTION FLOWMETER
The ball floats and gauge indicate the dilution stream flow rate, and are con-
trolled 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.
CHAMBER switches and indicators
Series 500 Dynacalibrators have two permeation chambers. Each chamber has a
switch which places the chamber in line with the diluent stream, and two indica-
tors to provide visual confirmation of the switch setting. Each chamber is func-
tionally independent, so that the user can select either, both, or neither chamber
to be in line with the diluent stream. These options allow four possible settings:
• ZERO, or CHAMBER 1 VENT/CHAMBER 2 VENT: Zero is effectively enabled
when neither chamber is selected; only the diluent stream passes through
the SPAN OUTLET. Use this setting to make sure there are no residuals in the
output stream.
• CHAMBER 1 SPAN/CHAMBER 2 VENT: With Chamber 1 set to SPAN, the carrier
flow from Chamber 1 is mixed with the diluent flow set by the Dilution Flow
Control Valve. This combined flow is dispensed through the SPAN OUTLET
port on the back panel. Increasing diluent flow decreases the concentration
delivered; decreasing diluent flow increases the delivered concentration. In
this setting, Chamber 2 carrier is vented and does not mix with the diluent.
• CHAMBER 2 SPAN/CHAMBER 1 VENT: With Chamber 2 set to SPAN, the carrier
flow from Chamber 2 is mixed with the diluent flow set by the Dilution Flow
Control Valve. This combined flow is dispensed through the SPAN OUTLET
port on the back panel. Increasing diluent flow decreases the concentration
delivered; decreasing diluent flow increases the delivered concentration. In
this setting, chamber 1 carrier is vented and does not mix with the diluent.
• CHAMBER 1 SPAN/CHAMBER 2 SPAN: With Chambers 1 and 2 both set to
SPAN, Carrier 1 and Carrier 2 are both mixed with the diluent flow controlled
by the Dilution Flow Control Valve. The combined total flows of Carrier 1,
Carrier 2, and Dilution Flow are distributed to the SPAN OUTLET port on the
rear panel. The total flows of all three streams must be used for an accurate
calculation of the delivered concentration.
Getting Started
13
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:
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
temperature range could result in the destruction of the
device by explosion and/or changes in the membrane
characteristics. 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.
14
Initial Power-Up
Connections
1. Plug the supplied power cord into the rear mounted power supply. Ensure
that the power supply output cable is plugged into the interface board power
connector.
2. Connect the carrier gas source (25 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.
Chamber Temperature
• Ifthechambertemperatureexceedsthevaluesetbythemechanical
temperature limit switch, the heater will automatically shut down and
a warning screen will appear on the touch screen controller.
• Whenthefrontpaneldoorisremoved,theheaterautomaticallyshutsdown.
• Alwaysrefertotheseparateinstructionsaccompanyingthepermeation
tube(s) to make sure that the selected temperature is compatible with the
permeation tube(s) being used.
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 11.)
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 17).Afteratemperaturesetpointisentered
by either method, it is written to memory so that after a power failure the unit
will return to the condition previously established.
15
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,thenreleasethem.ThePNLlightwillstopashing.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 titled
“Serial Port Communications”on page 17.
Setting the Oven Temperature Limit
Amechanicalthermostatisintegratedwiththetemperaturecontrolcircuit
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. Afterequilibrium,slowlyrotatethelimitswitchcounterclockwiseuntilthe
displayreads“PFAIL”.(Youmayhearafaintclick.)
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.
16
Setting the Chamber Temperature via Serial Port (RS-232)
Refer to the section titled“Serial Port Communications”on the next page.
Installing the Permeation Device(s)
1. Withthetoolprovided,rotatethepanellockscrew90°counterclockwise.
2. Remove the front panel oven cover to access the chamber cap.
CAUTION: The permeation chamber cap may be warm to
touch.
If the calibrator has been in use, avoid exposure to gas
vapors while opening the chamber cap by using appropriate
mitigation and personal protection equipment.
3. Unscrew the chamber cap with the tool provided.
4. Addorremovethepermeationdevice(s)withthesuppliedforcepsorother
tool appropriate to the job..
5. Secure the chamber cap with the tool provided.
6. Run a pressure/decay test to make sure that the chamber cap is leak tight.
7. Reinstall the front panel assembly and rotate the panel lock screw
90°clockwise.
8. Allowonehourforequilibration.Refertotheseparateinstructionsaccom-
panying the permeation tube to make sure that the selected temperature is
compatible with the permeation tube being used.
The Dynacalibrator is ready to be put into service.
Important Permeation Device Considerations
• Ifmorethanonetubeistobeusedintheovenatthesametime,orderallthe
tubes with permeation rates given at the same temperature.
• Certiedpermeationdevicesshouldbeusedonlyatthetemperaturespecied
on the certificate.
• Usinganypermeationdevicebeyonditsrecommendedtemperaturerange
could result in the destruction of the device by explosion and/or changes
inthemembranecharacteristics.Ifindoubt,contactVICIMetronicsortheir
authorized representative with the part number of the device to determine its
maximum temperature limit.
Initial Power-Up
Table of contents
