Teledyne 6200T - Sulfides Analyzer - Manual (Page 250)

Troubleshooting Model 6200T Total Sulfur Analyzer
250 Teledyne Analytical Instruments
12.5. Other Performance Problems
Dynamic problems (i.e. problems which only manifest themselves when the analyzer is
monitoring sample gas) can be the most difficult and time consuming to isolate and
resolve. The following section provides an itemized list of the most common dynamic
problems with recommended troubleshooting checks and corrective actions.
12.5.1. Excessive noise
Excessive noise levels under normal operation usually indicate leaks in the sample
supply or the analyzer itself. Ensure that the sample or span gas supply is leak-free and
carry out a detailed leak check as described earlier in this section.
Another possibility of excessive signal noise may be the preamplifier board, the high
voltage power supply and/or the PMT detector itself. Contact the factory on trouble-
shooting these components.
12.5.2. Slow Response
If the analyzer starts responding too slowly to any changes in sample, zero or span gas,
check for the following:
 Dirty or plugged sample filter or sample lines.
 Sample inlet line is too long.
 Dirty or plugged critical flow orifices. Check flows, pressures and, if
necessary, change orifices (refer to Section 11.3.4).
 Wrong materials in contact with sample - use Teflon materials only.
 Sample vent line is located too far from the instrument sample inlet causing
a long mixing and purge time. Locate sample inlet (overflow) vent as close
as possible to the analyzer’s sample inlet port.
 Dirty sample chamber.
 Insufficient time allowed for purging of lines upstream of the analyzer.
 Insufficient time allowed for SO
2
calibration gas source to become stable.
12.5.3. The Analyzer Doesn’t Appear on the LAN or Internet
Most problems related to Internet communications via the Ethernet card will be due to
problems external to the analyzer (e.g. bad network wiring or connections, failed routers,
malfunctioning servers, etc.) However, there are several symptoms that indicate the
problem may be with the Ethernet card itself.
If neither of the Ethernet cable’s two status LED’s (located on the back of the cable
connector) is lit while the instrument is connected to a network:
 Verify that the instrument is being connected to an active network jack.
 Check the internal cable connection between the Ethernet card and the CPU
board.
12.6. Subsystem Checkout
The preceding sections of this manual discussed a variety of methods for identifying
possible sources of failures or performance problems within the analyzer. In most cases
this included a list of possible causes and, in some cases, quick solutions or at least a
pointer to the appropriate sections describing them. This section describes how to