Spectrasensors SS2000 - Alarms

Operating the SS2000 System
3–12 H
2
S in Natural Gas
Option, enter Mode 2 by pressing the # key followed by the 2 key.
When prompted for a password, press 3142 followed by the * key
to enter the number.
8. Press the * key multiple times to scroll through the parameters until
4/20 Alarm Option displays.
9. Press 1 to force the loop current to 20 mA, or 0 to force the loop
current to 4 mA. Press the * key to enter the setting.
10. Press the # key followed by the 1 key to return to Normal Mode.
11. Adjust the receiver calibration control to read the appropriate value.
A current loop output of 4 mA always represents zero concentration.
12. Reset 4/20 Alarm Option to the opposite state and adjust the
receiver calibration controls for the new state. If needed, repeat
steps 7-11 to obtain an accurate calibration over the range.
13. After obtaining an accurate calibration of the current loop receiver,
switch off the power to the analyzer using the switch or circuit-
breaker designated as the disconnection device for the equipment.
14. Reconnect the temperature/pressure connector and power up the
analyzer by energizing the circuit to the analyzer.
Alarms
The analyzer is equipped with two dry contact relays that indicate a system
fault or alarm state. See Figure 2–6 on page 2–13 for relay assignments. In
addition, alarm and fault messages appear on the front panel LCD and are
transmitted via RS232.
The High Concentration Alarm is triggered when the measured
concentration exceeds the level set in Mode 2. See the High Alarm Action
parameter on page 3–6. A high concentration causes the High Concentration
Alarm and General Fault Alarm relays to be activated and the message
“Concentration High” to appear on the LCD. To cancel the alarm
The General Fault Alarm is triggered not only by the High Concentration
Alarm, but also by system faults which cause the General Fault Alarm relay
to be activated and the current loop to respond according to the 4/20 Alarm
Option setting. System faults in include one or more of the following:
• Fitting out of Limit: this fault occurs when the system is unable to
adequately fit a curve to the measured signal typically as a result of
too much noise in the signal or an unexpected gas mixture in the
measurement cell.
• Laser Power too Low: this fault occurs when the DC signal
becomes too weak for a reliable measurement typically as a result of
mirror contamination.