Emerson 2120 - Verify Operation; Led Indication

Quick Start Guide
13
December 2016
5.0 Configuration
Note
Recommended installation for a high level alarm is “Dry on” and for a low level
alarm it is “Wet on”. Do not install in the normally ‘off’ state.
Set mode switch and switching time delay
1. Select “Dry on” or “Wet on” mode.
2. Select 0.3, 1, 3, 10, or 30 seconds for the delay before switching output state.
(There is an initial five second delay when changing mode or time delay).
Figure 6. Top-down View of Example Cassette Inside Housing
A. LED
B. Mode Switch and Time Delay
6.0 Verify operation
6.1 LED indication
See Table 1 for the LED indications.
Table 1. LED Flash Rate
LED flash rate Switch status
Continuous Output state is on
1 every second Output state is off
1 every 2 seconds
Uncalibrated: Refer to the “Replacement and Calibration of Electronic
Cassettes” section in the Rosemount 2120 Reference Manual
or
Manual Supplement
1 every 4 seconds Load fault; load current too high; load short circuit
2 times every second Indication of successful calibration
3 times every second Internal PCB fault (microprocessor, ROM, or RAM)
Off Problem (e.g. supply)
OPERATION MODE
Dry On Mode
Dry
Wet
Wet On Mode
Dry
Wet
Dry On Wet On
Seconds Delay
0.3 0.3
3
30
10
1
3
30
10
1
12
3
OUT
+
-
4
PLC/PNP
Isolate Supply
Before Removing
B
A