Analytical Gas Monitoring System : User Guide

Introduction

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 4 primary parts:

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This system comprises is comprised of four pieces of hardware purchased from National Instruments (http://www.ni.com/en-us.html).

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The data acquisition system is an input-conditioned intrinsically safe Ethernet-based data logger (Figure 2) and data acquisition board (Figure 3). It has 8 input channels, of which we currently use 3 (Figure 4). 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 (Figure 5).
The Mac address is 00:29:4A:C4:59:E8 (Figure 6). It connects via Ethernet to port 39 in the pallet stores (Figure 7).

Figure 2. Data logger. 

Figure 3. Data acquisition board.

Figure 4. Three acquisition channels in use.
 

Figure 6. Data acquisition device labeling.
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Figure 7. Ethernet connection to acquisition device. 

8B38 Isolated signal conditioning module

Three of these signal conditioning modules are currently installed in the data logger

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. 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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The pressure sensor measures pressure in the 0–3000 psi range (Figure 9). 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, one on each (of 2) argon banks and one on the single helium bank. These require no maintenance or special considerations, other than taking care not to physically crush them when working near them.

Figure 9. 0–3000 psi pressure sensor.

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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 (Figure 10).

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Software

Data Logging Software

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The database table creation script is included in the source code for the resteasy-monitor project, located at {*}{_}https://shiptest.ship.iodp.tamu.edu/svn/jr/java/resteasy-monitor._*
The database table exists in the LIMS tablespace, and the services use the LIMS account to read/write from the table. No special user authentication is currently required to write from/read to these services. One sequence, LIMS.MONITOR_SEQUENCE, and one trigger, LIMS.MONITOR_TRIGGER exist as part of this package for the sole purpose of incrementing a unique ID (LIMS.MONITOR.MONITOR_ID ) on the table. The trigger also sets the timelogged field to the value of SYSDATE (current time in GMT per our configuration) when a new entry is created.
A .NET client for the Web services is included in the in GasDataCollector software. The client is located at {*}{_}https://shiptest.ship.iodp.tamu.edu/svn/jr/NET/GasMonitorUploader/gasmon/_*MonitorService.cs.
A Silverlight client for the services is included in the GasStatus Web page, and can be found at {*}{_}https://shiptest.ship.iodp.tamu.edu/svn/jr/Silverlight/GasStatus/trunk/gasstatus/MonitorService.cs._*

Data Reporting Services

GasStatus is the only current data reporting service for the system. Data is reported in one of two ways:

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