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Author(s)
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Chris Bennight
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Original
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8/10/2010
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Revision
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V378P, Sept 2018
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Analytical Gas Monitoring System
The analytical gas monitoring system is a collection of hardware, software, and infrastructure designed to record, report, and alert interested parties in the current and historical status of various analytical gases. The monitoring system currently comprises
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2 primary parts:
- Hardware
- Data logging
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Quick Start
Load the web page: {*}{_}http://web.ship.iodp.tamu.edu/tasapps/gasstatus_* on any computer on the ship to view the current status of gas supply (Figure 1).
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Hardware
This system comprises four pieces of hardware purchased from DataQ Instruments (http://www.dataq.com).
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Part Number
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Description
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Quantity
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DI-718B-E
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Ethernet data logger/data acquisition system
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1
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DI-8B38-05
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Isolated signal conditioning module, strain, 10 VDC, 2 mV/V
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3
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FSH00827
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Female port pressure sensor (PFP350 Series) 0-3000psi
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3
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FSH01785
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Thirty foot cable with LEMO connector.
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3
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- and reporting software
Hardware
This system is comprised of four pieces of hardware purchased from National Instruments (http://www.ni.com/en-us.html).
Part Number | Description | Quantity |
NI-9237/779521-01 | 4-channel C series strain/bridge input module (RJ50 connectors) | 1 |
| cDaq-9181/781496-01 | 1-Slot, ethernet CompactDAQ chassis | 1 |
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Isolated signal conditioning module, strain, 10 VDC, 2 mV/V
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3
FSH00827 | Female port pressure sensor (PFP350 Series) 0-3000psi | 3 |
FSH01785 | Thirty foot cable with LEMO connector. | 3 |
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cDaq-
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The data acquisition system is an input-conditioned intrinsically safe Ethernet-based data logger and data acquisition board. It has 8 input channels, of which we currently use 3. The device collects data from the module installed in each of these inputs and sends it over an Ethernet network to client software (either WinDaq or client software written using the DataQ SDK).
The device is currently installed in the lower pallet stores, against the back wall.
The Mac address is 00:29:4A:C4:59:E8. It connects via Ethernet to port 39 in the pallet stores.
Data logger
Data acquisition board
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8B38 Isolated signal conditioning module
Three of these signal conditioning modules are currently installed in the data logger. They provide electrical isolation and signal conditioning necessary to convert the output of the pressure sensors to a 0–5 V final output range.
One of these units is required for each sensor connected to the data logger, up to a maximum of 8.
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9181/781496-01
The cDaq 9181 is a chassis used for housing NI C series I/O modules. The chassis controls the timing, synchronization, and data transfer between the module and an external host.
NI-9237/779521-01
The NI-9237 includes all signal conditioning required to power and measure up to four bridge-based sensors simultaneously.
Currently, channel 0 is used to monitor the helium pressure and channel 1 is used to monitor the argon pressure.
FSH00827 0–3000 psi Futek pressure sensor
The pressure sensor measures pressure in the 0–3000 psi range. It is supplied an excitation of 10 V and has an LEMO connector. Connector pin out is listed on the side of the sensor, with an output positive and negative and excitation positive and negative.
Three of these sensors are currently installed. These require no maintenance or special considerations, other than taking care not to physically crush them when working near them.
0–3000 psi pressure sensor.
30 foot LEMO cables
These 30 foot braided steel shielded cables have a LEMO connector on one end to plug directly into the sensor and 4 bare wire terminals on the other end to connect to the data logger.
Software
Data
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The data logging portion of this system is composed of two parts:
- WinDaq to communicate with the actual logger and perform the data translation
- GasMonitor, in-house .NET software that communicates with WinDaq to collect sensor data and then with Web services to store the data in a database
Data Logging Services
The DataQ Instrument Hardware Manager searches the network for available data loggers. If none are detected, verify that the DI-718 logger has power and is connected to the Ethernet. If the status light near the ethernet port is red (Figure 7), power cycle the device (unplug/plug in power). The data logger can only be attached to one instance of the DataQ hardware manager/WinDaq at a time, so typically one computer is designated as the data collection box.
To start software monitoring of gas pressure, follow these steps:
- Start DataQ Instrument Hardware Manager.
- Once a logger has been detected (Figure 11), select the Start WinDaq button.
- WinDaq can be run in default mode (Figure 12).
- An ISO of the WinDaq CD is located on the ship developer box under /Volumes/Ozymandias/ConfigurationManagement/software/WinDaq/windaq_april_15_2010.iso
- Close the DataQ Instrument Hardware Manager screen.
- Once WinDaq is communicating with the data logger, start the Gas Data Collector software (Figure 13) ({*}{_}http://web.ship.iodp.tamu.edu/tasapps/gasmonitor_*).
- This requires the .NET 3.5 run time and WinDaq to be installed. Source code is located at {*}{_}https://shiptest.ship.iodp.tamu.edu/svn/jr/NET/GasMonitorUploader_*)
- Press Start, then minimize the application and leave running in the background.
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Database/Webservices
The data back end consists 2 parts:
- A database table: LIMS.MONITOR (see below)
- A set of Web services: resteasy-monitor
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Column Name
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Data Type
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Nullable
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MONITOR_ID
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NUMBER
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No
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TIMELOGGED
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TIMESTAMP(6)
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Yes
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EXPEDITION
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VARCHAR2(20 BYTE)
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Yes
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DATA_GROUP
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VARCHAR2(100 BYTE)
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Yes
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DATA_DURATION
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VARCHAR2(100 BYTE)
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Yes
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DATA_INSTRUMENT
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VARCHAR2(100 BYTE)
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Yes
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DATA_SENSOR
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VARCHAR2(100 BYTE)
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Yes
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DATA_LOCATION
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VARCHAR2(100 BYTE)
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Yes
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DATA_COMMENTS
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VARCHAR2(4000 BYTE)
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Yes
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DATA_NAME
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VARCHAR2(50 BYTE)
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Yes
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DATA_VALUE
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VARCHAR2(50 BYTE)
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Yes
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DATA_UNITS
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VARCHAR2(20 BYTE)
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Yes
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DATA_LOGGED_BY
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VARCHAR2(50 BYTE)
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Yes
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Data Reporting Services
GasStatus is the only current data reporting service for the system. Data is reported in one of two ways:
- Overview/alarm display (Figure 14)
- Gas details display (Figure 15)
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is reported through two Labview gas monitoring programs. One master/main gas monitor which can only be used in one location, and a remote gas monitor for use in other locations. The master version communicates with the loggers and collects data; and the remote version receives data shared by the master version.
Main Gas Monitor
The main gas monitor should only be used from one set pc as the remote gas monitor obtains values by looking for shared variables coming from that pc. This is because the cDaq-9181 can only communicate with one pc and must be reserved by a pc in NI MAX. If the main gas monitor is to be used from a different pc, the device needs to be reserved by the new pc and the remote gas monitor will have to be edited to point at the new pc.
To reserve the cDaq-9181 to a new pc:
- Open NI MAX on the new pc
- On the left, navigate to My System > Devices and Interfaces > Network Devices
- Select the NI cDaq-9181 "gasmon"
- Select Reserve Network Device
The main gas monitor can now be run by opening the gasmon_main.vi.
Remote Gas Monitor
This display allows the user to view the actual pressure of
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Gas details view
This view provides a detailed history of each gas bank. The current status is displayed for the selected gas, as well as a visual indicator (gauge). A history displays the history of gas pressures over time. Access the details view by clicking on the desired analytical gas in the top menu. This reporting page can be accessed at [{*}{_}http://web.ship.iodp.tamu.edu/tasapps/gasstatus._*
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the Helium and Argon gasses connected on Upper Tween. Red zones indicate that the gas lines should be switched to a new set of bottles. The stop button stops data updating. The play button in the upper left of the window will start it again.
If the main gas monitor has been switched to another pc, it will be necessary to update the remote monitor's labview code to direct it towards the new pc.
- Open standalone_remote.vi
- Select Window > Show Block Diagram
- The outlined fields in the picture below will need to be updated with the name of the new pc.
- ni.var.psp://PC NAME HERE/gas_monitoring/helium_pressure_shared
- ni.var.psp://PC NAME HERE/gas_monitoring/argon_pressure_shared
Archived Versions
Analytical gas monitoring - 29Sept2022