SS500e/SS2000e/SS3000e Gas Analyzers
B–20 4900002230 rev. D 2-6-20
Table B-1 Potential instrument problems and solutions (Continued)
Symptom Response
Front panel display is not lit and no char-
acters appear. (continued)
Check for 5 VDC on red wires, 12 VDC on
yellow wires, and 24 VDC on orange wires
from power supply (black wires are
ground).
Check connections on display communica-
tion and power cables.
Strange characters appear on front panel
display
1) Make sure the EEProm is seated well.
2) Disconnect and reconnect the main
board.
No reading on device connected to
current loop
Make sure that connected device can
accept a 4-20 mA signal. The analyzer is
set to source current.
Make sure the device is connected to the
correct terminals on the green connector
(see Figure 3–5 on page 3–12).
Check the open circuit voltage (35-
40 VDC) across the current loops termi-
nals on the green connector (see Figure
3–5 on page 3–12).
Replace the current loop device with a
milliampere meter and look for current
between 4 mA and 20 mA. A voltmeter
connected across a 249-ohm resistor can
be used instead of the milliampere meter;
it should read between 1 and 5 volts.
Pressing keys on front panel do not have
specified effect
Check connections on keypad cable.
Reading is erratic or seems incorrect Check for contamination in the sample
system, especially if the readings are
much higher than expected.
Capture diagnostic data and send the
file to SpectraSensors (refer to “To read
diagnostic data with Hyper-Terminal”
in the Firmware Operator’s Manual).
Reading goes to “0”
If 4-20 mA Alarm Action is set to 0,
look on display for a fault message (refer
to the Firmware Manual for instruction on
system faults and “To change parame-
ters in Mode 2”).
Gas concentration is equal to zero.
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