Model 98RK-1 & Model 9816
Rackmount Intelligent Pressure Scanner
User’s Manual
August 2009
NetScanner™ System
www.PressureSystems.com
©This User’s Manual is a copyright product of Pressure Systems, Inc., 2009
Permission is hereby granted to make copies and distribute verbatim copies of
this manual, provided the copyright notice and this permission notice are preserved on all copies.
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Chapter 1
General Information
1.1Introduction
This User’s Manual will:
Explain the electrical and pneumatic pressure connections for the Model 98RK-1 Scanner Interface Rack and Model 9816 Rackmount Intelligent Pressure Scanners.
Provide computer set-up instructions to make a proper Ethernet connection on most Windows® -based personal computers.
Instruct you on using the PSI start-up software to manipulate and acquire data from each Model 9816 scanner in the rack.
Instruct you on how to program each module with computer software.
Figure 1.1
Model 98RK-1 Scanner Interface Rack with
Model 9816 Rackmount Intelligent Pressure Scanners
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The NetScanner™ System is a comprehensive, distributed data acquisition system centered around PSI’s proven Intelligent Pressure Scanner technology. The rackmount configuration of this system is comprised of Model 98RK-1 Scanner Interface Racks, each housing up to eight
(8) Model 9816 Rackmount Intelligent Pressure Scanners networked via the Ethernet interface. The 98RK-1 chassis provides communication, power supply and pneumatic connections to the 9816 scanners. The 98RK-1 utilizes an integral gigabit switch to connect all scanners to a host computer. Each 98RK-1 can also provide power and communication to as many as three (3) remotely connected NetScanner modules such as the Model 9116 Pneumatic Intelligent Pressure Scanners, Model 9022 All-Media Intelligent Pressure Scanners, Model 9046 Intelligent Temperature Scanners, and Model 903x Pressure Controllers. Refer to their respective datasheets for more information on these NetScanner System components. A typical system configuration is shown in Figure 1.2.
Each Model 9816 Rackmount Intelligent Pressure Scanner module integrates sixteen (16) silicon piezoresistive pressure sensors and a unique patented calibration manifold with an onboard
32-bit microprocessor. This provides compensated engineering unit (EU) data output via
the Ethernet interface. Each pressure sensor is packaged with an integral EEPROM for storage of calibration data unique to the sensor. Integrating the EEPROM within the sensor enables simple ‘plug and play’ field replacement of transducers with automatic uploading of sensor data during system power-up.
Figure 1.2
Typical NetScanner System Configuration
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Data uploaded from the EEPROMs is used by the microprocessor to correct zero, span, linearity, and thermal errors. Digital temperature compensation of the piezoresistive sensors reduces thermal errors by a factor of ten or more over conventional sensor compensation. The microprocessor also controls the execution of on-line zero or span calibrations upon request. On-line re-zero virtually eliminates sensor zero drift error and provides guaranteed system accuracy of up to ±0.05% FS (Full Scale) after re-zero.
Firmware within each 9816 scanner provides the capability to sample using up to three (3) scan lists concurrently at rates up to 100 measurements per channel per second. The NetScanner™ System is supplied with software for PC compatible computers.
1.2Description of the Instruments
Model 9816 Intelligent Pressure Scanners are available with 16 (sixteen) measurement channels, each with individual pneumatic transducers per channel. The most distinctive features are highlighted below:
Pre-calibrated Transducer - a memory chip containing full thermal calibration data is embedded within each internal transducer.
Individual transducer per measurement input channel.
Mixed transducer ranges may be installed in a single module.
Low cost per point - per-channel cost is less than a typical industrial pressure transducer/transmitter.
High accuracy - Model 9816 pressure scanners are capable of accuracies up to ±0.05%. Accuracy is maintained through use of built-in re-zero and span calibration capabilities. Accuracy is maintained for six (6) months after calibration.
Low thermal errors - each transducer of a pressure scanner module contains an individual temperature sensor and thermal calibration data for internal use by software correction algorithms. Thermal errors are reduced to ±0.001%FS/ºC over the calibrated temperature span.
Re-zero upon demand - an integrated calibration valve allows for automatic re-zero adjustment calibration of dry gas transducers to null offset drift errors.
Ease of transducer replacement - factory calibrated transducer assemblies may be stocked and rapidly replaced in the field. Storage of thermal coefficients within the transducer allows for ‘plug and play’ transducer replacement.
Ease of calibration - 98RK-1 Scanner Interface Rack features pneumatic hook-ups on the back-panel and front-panel (if ordered) to ease scanner calibration. Each 9816 Intelligent Pressure Scanner module contains a pneumatic calibration manifold and software commands to automatically perform re-zero and span adjustment calibrations. New offset and gain coefficients that result from the most recent calibration may be stored in non-volatile transducer memory.
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The 98RK-1 Scanner Interface Rack features a gigabit switch that significantly increases processing capabilities and speed.
System calibration consists of zero and span calibration only at any given temperature. Full thermal re-calibration is never necessary.
Ease of use - modules have simple command sets and provide engineering units (EU) output. They may interface directly to a desktop or laptop computer or they may be interconnected into a large network controlled by many types of host computers.
Connectivity - use of industry-standard TCP/UDP/IP communications network protocols to control and read data from NetScanner™ System modules ensures compatibility with third party hardware and software.
1.3Options
1.3.1Pressure Ranges
Model 9816 Intelligent Pressure Scanners contain sixteen (16) DH200 transducers. These DH200 transducers are available with full scale pressure ranges from 10" H2O (inches of water column) to 850 psid (2.5 kPa to 5860 kPa). Transducers with different pressure ranges may be combined in a single module.
Please consult the Sales Department at Pressure Systems at 1-800-678-SCAN (7226) for availability of other pressure ranges as well as other modules which may be attached to the
98RK-1 Scanner Interface Rack.
1.3.2Manifolds and Pressure Connections
The Model 9816 sixteen-channel Intelligent Pressure Scanner is available with either a true differential (reference per port) or common differential (single reference port) pneumatic manifold, and are both equipped with a purge and leak-check manifold. The standard frontmount input and the optional rear-mount input for the 9816 scanner both include a rectangular quick disconnect (QDC) plate with 0.063" (0.040" optional) bulge tubes.
Compression fittings (1/8", 1/16", or ¼" tube outside diameter (O.D.)) are available only for common reference, front-mount scanners. True differential scanners are only available with bulged tubulation front-mount QDCs. Consult the Sales Department at Pressure Systems for availability of other input fittings.
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1.3.3Communication Interfaces
All Intelligent Pressure Scanners provide digitally temperature compensated and linearized pressure data in engineering units through an Ethernet communications interface to a host computer.
Model 9816 Intelligent Pressure Scanners have a 10Base-T Ethernet host communications interface using industry standard TCP/UDP/IP protocols. This interface provides high data transfer rates (10MBit/sec.) and system connectivity.
The 98RK-1 incorporates a gigabit switch which auto negotiates the highest speed connection supported by the connected equipment. The 98RK-1 incorporates a universal input AC-DC power supply accepting input voltages from 90-250 VAC at 50 or 60 Hz and is capable of supporting a full complement of NetScanner products.
Figure 1.3
98RK-1 Rear Panel
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Chapter 2
Installation and Set Up
2.1Unpacking and Inspection
Before assembling the system, use the shipping bill as a reference to ensure that all parts have arrived. Pressure Systems takes no responsibility for equipment that is damaged during shipment. If containers are broken, ripped, or damaged, contact the transportation carrier. If the equipment itself appears to be damaged, contact the Repair Department at Pressure Systems at 1-800-678-SCAN (7226).
Each shipment will contain one or more of the following components:
98RK-1 Scanner Interface Rack chassis
9816 Intelligent Pressure Scanner modules (installed in the 98RK-1, if ordered)
Start-up software (NUSS) on CD-ROM
9882 Pneumatic Blanking Unit (if purchased)
98RK-1 Scanner Interface Rack User’s Manual on CD-ROM.
2.2Safety Considerations
It is always a good idea to wear safety glasses when operating this equipment or when working with pressurized lines. Always ensure that high pressure lines are properly secured and that all pneumatic lines are rated for the proper pressure and temperature environments.
Ensure that the rack Power Switch is turned OFF before plugging the Scanner Interface Rack into a power receptacle. Always check line voltages and ensure the correct voltage for your Scanner Interface Rack prior to plugging into the receptacle.
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2.3Connections and Setup
2.3.198RK-1 Chassis Connections with 9816 Scanners
Ensure correct line voltage and that the Power Switch for the 98RK-1 is in the OFF STEP 1 position. Connect the 98RK-1 chassis to an adequate power receptacle and connect
an Ethernet cable from the 98RK-1’s host port (TO HOST) to an optional 10/100/1000Base-T hub, switch, or directly to your computer’s Ethernet card.
Figure 2.1 (on the next page) depicts a typical Pressure Systems’ NetScanner™ System array. Although this figure depicts the front and back of two 98RK-1 Scanner Interface Racks, multiple 98RK-1 Racks, with up to eight (8) scanners per rack, may be networked together. Each chassis provides scanner power supplies and pneumatic connections as well as switch circuitry for up to eleven (11) 10/100Base-T connections, and a 10/100/1000Base-T (gigabit) host link. This enables each chassis to connect with the host computer as well as with up to three (3) additional scanners (and/or standard/ calibration units) which may be externally attached to each rack.
2.3.2Connections for External Modules
If you are connecting a Model 9016/9116, or 9021/9022 Intelligent Pressure Scanner, a Model 903x Intelligent Pressure Calibrator or Standard, or a 9046 Intelligent
STEP 2 Temperature Scanner to the rear of your 98RK-1, connect the ruggedized circular connector of the 9082 cable to your scanner’s connector port. Connect the other end
of the same cable to one of the ports on the rear of the 98RK-1 chassis labeled “Remote NetScanner Module Interface.” (See Figure 2.1)
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Figure 2.1
Typical Hook-up Arrangement
Using the 98RK-1 Scanner Interface Rack
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2.3.3Network Communications Hookup
The 98RK-1 Scanner Interface Rack chassis has an Ethernet connector port on the rear of the unit through which all scanners in the rack may be connected to the network or the Ethernet card in your PC or work station. This port is labeled “ TO HOST” (using an RJ-45 connector). Similarly, every Model 9016, 9116, 9021, or 9022, 903x and 9046, has an Ethernet connecting port using TCP/IP transmission protocol through their single circular connector.
STEP 3 If required, install an Ethernet card in your computer.
STEP 4 |
Set up or confirm the TCP/IP protocol and address of the host computer as shown in |
the following steps. |
Communications via Ethernet using TCP/IP protocol uses module address designations and requires the host computer to have a compatible address.
Find the “Network Connections” icon on "Control Panel." Double-click the icon to
STEP 5 arrive at the "LAN or High Speed Internet" screen. Find the "Local Area Connection" icon and select it (Left click). Select “Properties” from the "Local Area Connection" by
right clicking the icon. A screen example is shown on the next page.
All of the screen examples in this User's Manual are from Note Windows® XP operating system. If you are using a different
operating system and need assistance in setting up your network, contact the Applications Support Group at Pressure Systems.
Scroll down the “Local Area Connection” tab to ensure that "Internet Protocol TCP/IP" STEP 6 is available. NOTE: a dial-up adapter may also exist for internet access. This is NOT
the protocol that is being verified.
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Initial Network Screen for Windows® XP
STEP 7 |
With your mouse, right-click on the "Local Area Connection" icon. A drop-down menu |
will appear. Scroll down the menu and select (left-click) the "Properties" line. |
Scroll down the “Local Area Connection” tab to ensure that "Internet Protocol TCP/IP" STEP 8 is available. NOTE: a dial-up adapter may also exist for internet access. This is NOT
the protocol that is being verified.
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A screen example is shown here.
STEP 9 |
With your mouse, right-click on the "Local Area Connection" icon. A drop-down menu |
will appear. Scroll down the menu and select (left-click) the "Properties" line. |
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A screen example is shown on the next page.
Scroll down the “Local Area Connection Properties” tab to ensure that "Internet STEP 10 Protocol TCP/IP" is available. NOTE: a dial-up adapter may also exist for internet
access. This is NOT the protocol that is being verified.
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If the TCP/IP protocol is not found, it must be installed. To install, select "Install" as STEP 11 shown on the "General" tab on the "Local Area Connection Properties" screen.
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Once the correct TCP/IP protocol is installed and verified for the proper Ethernet STEP 12 card, the IP address (under TCP/IP Properties), that is compatible with the pressure
scanner(s), must be set.
A typical screen example with IP and Subnet Mask addresses for a 9816 scanner is shown on the next page.
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To set the PC address: Select "Use the following TCP/IP address." It is suggested that the IP Address read 200.xxx.yyy.zzz where xxx, yyy, and zzz are unique locations that do not match any other address on the network. (Check with your
STEP 13 network administrator to see that the numbers chosen do not conflict with any other addresses on the network.) It is suggested that the IP address should, as a default, read 200.1.1.1. This should allow you to talk with any other modules on the network. The Subnet mask should read 255.0.0.0. Select OK. The host computer is now set to communicate via the Ethernet card to the 9816 module.
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Connect the Ethernet cable between the 98RK-1 “TO HOST” RJ-45 connector and |
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the Ethernet card of your host computer. |
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After you set the IP address and the subnet mask, click “OK”. You may then be prompted to re-start your computer so that the inputs will be recognized.
The host computer and each module must have a unique Ethernet Hardware Address and a unique IP Address. The Ethernet Hardware address is generally fixed (at manufacturing time of the Ethernet microprocessor board inside the module). The Ethernet Hardware address is shown on each NetScanner™ System module’s label. PSI’s Ethernet Intelligent Pressure Scanners are capable of supporting various methods for IP address assignment, using either the factory default or user-configured Static IP addressing or Dynamic IP address assignment. Dynamic IP address assignment is through the use of RARP or BOOTP protocols. Unless your application requires the use of Dynamic IP address assignments, it is strongly suggested that the module be left configured to use the Static IP address. The default method is typically the simplest method for using the Intelligent Pressure Scanner.
Note |
After closing the TCP/IP connection to a module, the host must |
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wait 10 seconds before reconnecting. |
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The PSI software (shipped with your module(s)) is called NetScanner Unified Startup Software (NUSS) and is designed to be compatible and operate with most Windows®-based operating systems.
Insert the CD-ROM containing the software shipped with your NetScanner™ System (NUSS) into the appropriate drive of your computer. Using your Windows® “Start/Run” button, type D:\SETUP (or use appropriate drive designation), and
STEP 15 follow any on-screen instructions. This will load the NUSS software onto your hard drive. NUSS is self-installing from your CD-ROM, or may be downloaded from the PSI Web site (www.PressureSystems.com/netscanner_software.html). It may be installed multiple times and on as many computers as desired.
The executable file will automatically be installed as (typically):
C:\ NUSS\NUSS.EXE
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Turn the 98RK-1 power switch ON and wait approximately thirty (30) seconds for STEP 16 the scanners to perform self-diagnostics. The scanners automatically upload the
calibration data stored within each transducer at start-up. Newly installed transducers are automatically ready to be used without further calibration.
Select (double click) the executable file (NUSS.EXE) using “Windows Explorer” or STEP 17 “My Computer” or select (double click) your desktop shortcut icon. (See Appendix
C for instructions on how to create a shortcut icon.)
The initial screen of the NetScanner™ System software (NUSS) is shown on the next page.
At this point, the best way to see if you have correctly connected your NetScanner™ System with the 98RK-1 Scanner Interface Rack is to observe the Host Link (LNK) light, located on the front panel of the 98RK-1. The 98RK-1 will auto-negotiate for maximum speed connections (up to 1 gigabit/sec) and will automatically correct for swapped signal pairs. With the LNK light ON, the system is correctly connected to your Ethernet network or host computer. The 98RK-1 will display a yellow LNK light when it has negotiated a 10T Ethernet connection, green for 100T or blue for a gigabit connection. The LNK light will blink during communications activities. If the LNK light is not ON, re-trace your steps to find the connection error. You may use the “ ping” utility as described in the Chapter 6, Troubleshooting, in this manual to check proper electrical connection and TCP/IP configuration.
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NUSS Initial Screen
Once NUSS is selected, the Network Status Screen (shown above) appears. Note that a "Querying Network" message briefly appears, and then the Nodes on Network box will automatically display the each NetScanner module hooked into the network. It also shows their serial number, IP address, and whether or not they are active (connected or disconnected).
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Connect to any module. (When a connection has been established, the top of the module icon will turn yellow.)
STEP 18 Select (left click) the module's icon in the Node map. Right-click on the module's icon (in either the Node Map or the description box), and select (left click) on "Connect" in the pull-down menu that appears. (See screen depiction below.)
As stated above, if the module's icon does not turn yellow when selected, the module did not connect. Some possible causes for a failure to connect are:
There is an IP address incompatibility between the host computer and the module.
There are two modules with the same IP address.
For complete instructions on using NUSS for operating your modules, please refer to the NUSS User's Manual, available from Pressure Systems.
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2.3.4Pressure Connections
Pneumatic connections for the sixteen (16) measurement inputs of the Model 9816 Intelligent Pressure Scanners installed in the 98RK-1 Scanner Interface Rack may be found either on the backplane of the 98RK-1 chassis or on the 9816 front plate, depending on the particular configuration you ordered. Additional control, purge, and calibration inputs are found on the rear of the 98RK-1. The function of each input port is clearly engraved or printed next to each input (see Figures 2.2, 2.3 and 2.3a, next page). Connections are through bulge tubing, compression fittings, or special user-supplied fittings on the tubing plate. All pneumatic inputs to these modules should contain dry, non-corrosive gas only.
As a standard, all Model 9816 Intelligent Pressure Scanners are supplied with the purge/leak check calibration manifold. Through software commands to each 9816, this valve may be placed in one of four positions; RUN, CAL, PURGE, or LEAK-CHARGE. See functions 0C and 12 of the Set/Do Operating Options/Functions (‘w’) command in Chapter 3 for more information. Pneumatic input requirements for these four operating positions are described in following sections.
Here are some guidelines which should be followed when installing pressure connections to all NetScanner™ System Intelligent Pressure Scanner modules.
●It is always a good idea to wear certified safety glasses when working with pressurized lines.
●Ensure that your input pressure will not exceed the proof pressure ratings of the corresponding instrument transducer. Applying excessive pressure to measurement inputs can permanently damage the pressure transducers.
●Ensure that all tubing material is rated for the expected pressure and environmental conditions. Failure to use the proper tubing material may result in ruptured lines and possible personal injury.
●Ensure all high pressure lines are properly secured.
●Place retaining springs over all bulge tube fittings to ensure pneumatic lines remain attached and leak free. Springs should be pushed down on connections so that half of the spring length extends past the tube bulge.
WARNING: Introduction of contaminants to the module pneumatic inputs may damage transducers, manifolds, and O-ring seals.
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Figure 2.2
98RK-1 Rear View
Figure 2.3 |
Figure 2.3a |
Expanded View of 98RK-1 Scanner |
Expanded View of Model 9816 Intelligent |
Interface Rack Rear Manifold |
Pressure Scanner Rear Manifold |
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2.3.4.1Supply Air
The 98RK-1 chassis requires an 80 psig minimum (125 psig maximum) dry air (or inert gas) supply which is used to shift the 9816 internal calibration valve (in each scanner) between its different positions. Each 98RK-1 contains a fitting marked “SUPPLY” for this input (see Figure 2.2, previous page). Internal solenoid valves in each 9816 scanner direct this supply pressure to the proper control port on the calibration valve as required by instrument commands. The absence of sufficient supply air to the module will prevent the calibration valve from shifting into requested positions (i.e., RUN, CAL, PURGE, or LEAK-CHARGE). The pneumatic input manifold (on the rear of the chassis) contains an additional two transducers to read the supply and purge air pressures.
Connect 80-125 psig dry air to the chassis SUPPLY port. This is the power used to STEP 19 move the internal calibration valve between the four locations; RUN, CAL, PURGE,
and LEAK-CHARGE.
WARNING: Supply air should not exceed 125 psi (875 kPa). Excessive pressure may damage the internal solenoids.
2.3.4.2RUN Mode Inputs
The standard pneumatic quick disconnect ( QDC) tubing plates contain sixteen (16) numbered pneumatic input channels. These numbered inputs are attached to corresponding pressure transducers inside the instrument and should be pneumatically attached to the pressure measurement points under test.
The 98RK-1 pneumatic backplane also contains inputs labeled RUN REF (RUN REF 1 through RUN REF 8). With the common reference manifold, RUN REF 1 is the reference port for any 9816 scanner installed in 98RK-1 slot #1 (leftmost position when viewing from the front of the 98RK-1). RUN REF 8 is the corresponding reference for any 9816 scanner installed in 98RK-1 slot #8. The RUN REF inputs are pneumatically connected to the reference side of all internal DH200 pressure transducers, as shown in Figure 2.4 (next page).
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Figure 2.4
Optionally, the unit may be ordered with a true differential (reference per channel) manifold. The RUN REF connection is used for situations where all channels have one reference pressure. This input may also be left unattached to provide atmospheric reference pressure.
When using instruments with the reference per channel option (true differential), two (2) pneumatic inputs will be provided for every numbered channel. These inputs are labeled “P” and “R”. The “P” connection is the test pressure input. The “R” connection is the transducer reference input pressure. Since each channel has its own reference pressure input, the RUN REF input is not provided on the true differential tubing plate.
2.3.4.3CAL Mode Inputs
The 9816 model (in the 98RK-1) contains pneumatic backplane inputs for CAL(CAL 1-8) and CAL REF. When the module’s internal calibration valve is placed in the CAL/RE-ZERO position, all DH200 transducer pressure inputs are pneumatically connected to the CAL input ports. All DH200 reference inputs are pneumatically connected to the CAL REF input port. The CAL input may be used to perform on-line zero adjustment of the transducers. The CAL input may also be used for DH200 span adjustment calibrations and accuracy tests if appropriate pressure calibrators (such as the 903x series) are available. Span calibration of multi-range scanners may also utilize the CAL 1-8 ports if the highest applied pressure does not exceed the proof pressure rating of any other installed transducer, otherwise the individual transducers must be calibrated with the valve in the RUN position.
When the internal calibration valve is in the CAL/RE-ZERO position, the RUN inputs (RUN REF and numbered input ports) are pneumatically dead-ended to prevent migration of contaminants into the instrument.
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Figure 2.5
Each 9816 is manufactured with a connection to one of the eight (8) CAL port ranges, based on the unit’s full scale pressure range. Assignment of 9816's CAL range is show in Table 2.1 (next page). In the case of a 9816 with multiple pressure ranges installed, the unit will use the CAL range of the lowest installed full scale pressure range.
CAL port assignments are based on a pressure range, NOT 98RK-1 Note slot assignments.
Table 2.1
Pneumatic Connector Assignment
98RK-1
Connection |
Pressure Scanner Range Input |
Cal 1 User defined
Cal 2 10" W.C.; 20" W.C.; ±1 psid, ±1.5 psid
Cal 3 ±2.5; ±5 psid
Cal 4 ±10; ±15 psid, ±20 psid, ±25 psid
Cal 5 ±30; ±45; ±50 psid
Cal 6 ±75 psid, ±100 psid
Cal 7 +150; 200; 250; 300 psid
Cal 8 500 psid, 600 psid, 650 psid, 750 psid, 850 psid
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2.3.4.4PURGE Mode Inputs
9816 scanners are supplied with a purge/leak-charge feature. The purge feature allows users to apply positive pressure to the PURGE input which will then be vented out of the user input ports, forcing contaminants (such as moisture) out of the pneumatic input lines. (Note: on common reference 9816 scanners, only the numbered input ports will be purged. RUN REF is not purged). True differential 9816 scanners will purge both the run and reference input ports for all channels. The purge supply provided to the 9816 must always be a higher pressure than the highest pressure present on the input ports of the module. The purge supply must also be capable of maintaining proper purge pressure at the high flow rates encountered while the module is in the purge mode.
WARNING: Failure to provide proper purge supply pressure may result in migration of moisture and contaminants into the 9816 module. This can result in permanent damage to module components.
When commanded into the PURGE position, the purge input pressure will be connected to the numbered measurement input ports allowing for a flow of air away from the instrument. The purge cycle should be terminated by commanding the 9816 into a non-purge mode, such as
CAL.
WARNING: Purge cycles should NEVER be terminated by turning off the purge supply air while in the PURGE position.
Figure 2.6
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2.3.4.5LEAK Mode Inputs
The purge/leak-charge valve design includes a leak check feature capable of testing the integrity of user pneumatic connections as well as those within the 9816 module. For the leak mode to be used, all RUN mode pressure inputs must be dead-ended (closed) by the user. (Contact the PSI Sales Department for availability of an external leak check valve) When the 9816 is commanded into the LEAK/CHARGE position, the CAL 1-8 input ports will be pneumatically connected to the module run side inputs. Common reference modules will connect only the numbered run side inputs to CAL (RUN REF is not charged). True differential (reference per port) modules will connect both the measurement input and reference port to CAL. While in the LEAK position, a test pressure may be applied thought the CAL port which will charge the dead-ended run side tubulation.
Note Test pressures applied to the CAL port during leak check operation must not exceed the full scale pressure of any internal transducer.
Once the lines are charged, the 9816 may be commanded back to the RUN position. This will reattach the charged run side lines to their corresponding internal transducer. Consecutive pressure readings from the 9816 will now allow user to determine the line leak rates. (Factory testing allows a maximum leak rate of 2% in two (2) minutes.) Once returned to the RUN position, lack of pressure indicates a gross leak. A slowly declining pressure indicates a slight leak. A leak is more difficult to detect as tubing volume increases. In the case of true differential units where both sides of the sensor are pressurized with the leak test pressure, an initial differential pressure of 0.0 psi should be measured when the unit is placed in the RUN position. If the measurement or RUN side of the channel leaks at a rate greater than the reference side, a resulting negative differential pressure will be measured. Likewise, if the reference port tubing leaks at a rate greater than the measurement side, a resulting positive differential pressure will be measured.
Figure 2.7
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2.3.4.6Calibration Manifold Position Detector Circuit
The transducer calibration manifold position detector circuit uses reflective infrared sensors to sense the actual position of the manifold valve block. The block, located within the valve assembly, is shifted to a desired position by pneumatic pistons positioned around the block.
Two reflective infrared sensors, which sense the position of the block by the reflection of the sensor infrared beam from the block surface, are mounted into the assembly. If the block is in front of the sensor, a low level logic signal is output by the sensor, indicating the presence of the block. If the block is not in front of the sensor, the infrared beam is not reflected and the sensor outputs a logic high signal.
Outputs of these sensors are routed to the PC-299 microprocessor board and then to the CAL and purge (PRG) LEDs on the front of the module chassis. The following table shows the position of the transducer calibration manifold assembly corresponding to front panel LED illumination.
LED INDICATORS
VALVE POSITION |
CAL |
PRG |
RUN |
OFF |
OFF |
CAL |
ON |
OFF |
PURGE |
ON |
ON |
LEAK/CHARGE |
OFF |
ON |
2.3.5Cluster, Rack, and Slot Identification
The 98RK-1 Scanner Interface Rack can operate as a single unit, with one (1) to eight (8) pressure scanners installed in each rack. Racks may also be grouped together as a cluster of racks as part of a larger data acquisition system.
In order to physically identify individual scanners within a data acquisition system, a simple addressing scheme is available. Individual scanners are identified by their Cluster, Rack, and Slot (CRS) address, a three-digit hexadecimal number.
A cluster (the most significant address unit), is numbered 0-F (hex), for a total of 16 clusters of racks.
A rack (the middle address digit), may be numbered 0-15, for a total of 16 racks. (NOTE: The switch for setting the rack address is numbered in integers, but the address is returned in hex — 0-F.)
A slot (the least significant address unit), numbered 1 through 8, designates a particular 9816 pressure scanner.
The diagram on the following page depicts the 98RK-1 Scanner Interface Rack front pullout panel with switches identified for setting Cluster and Rack addresses. Cluster and Rack addresses may be set at any number (user option) as long as it falls within the range of the
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switch settings. (Slot addresses are automatically set by their specific physical presence within the rack.)
The cluster address is set via a slotted screwdriver-adjustable hexadecimal switch on the PC293 (Ethernet Controller board), located in the pull-out slide tray (front panel of the 98RK-1). Cluster address settings are 0 through F (a total of 16). In the illustration, the hexadecimal switch is annotated.
Figure 2.8
98RK-1 Front Pull-out Tray Diagram
Top and Front Views
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The rack address is set via a 16-position (0 through 15) push wheel switch, located on the front panel of the 98RK-1.
The slot addresses are numbered 1 through 8, starting from the leftmost slot in the 98RK-1 and each scanner’s address is fixed by its physical presence in the rack.
The following illustration shows how a typical CRS addressing system would identify a particular scanner:
Figure 2.9
Typical Depiction of C-R-S Scanner Identification
In the above depicted array, the CRS address of the shaded scanner would be 133, cluster 1, rack 3 and slot 3.
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