MSA 9010 SIL, Руководство по эксплуатации

Страница: 15 / 76

14
Description
GB
Model 9010/9020 SIL
2.4 Input Signal Configuration
The input configuration is set in Access Code 52, P2, see chapter 5.7.
2.5 Alarms and Overrange Functions
The alarm set-points are:
•
CAUTION (C) caution threshold
• WARNING (W) warning threshold
• ALARM (A) alarm threshold (STEL or TWA)
• Overrange (EEEE) indication on the display if the full scale is exceeded (>103 %)
Exceeding the alarm set-points will cause the relevant alarm LED as well as the digital output
(relay or opto-coupler) to be activated.
CAUTION, WARNING and ALARM Thresholds
The alarms can be configured in Access Code 4, which, besides setting the intervention thresh-
olds, allows the following configuration:
• setting alarm activation in case of rising or falling signal.
• setting the status of relay coils in normal conditions (energized or not energized).
Different reset modes:
• Automatic reset (1A)
• Automatic reset with memorization of alarm event (2A)
• Manual reset (1M)
• Manual reset with memorization of alarm event (2M)
For more information on the alarm reset modes see chapter 12.1.Acknowledging an alarm
(silencing the horn) and manual alarm reset can either be done with the UP or DOWN key on the
front panel or be performed remotely (see TERMINAL CONNECTIONS DIAGRAMS, Fig. 7 and
Fig. 8).
WARNING!
The Alarm set points are scaled in percentage related to the defined measuring range. It is neces-
sary to check C,W, A alarm thresholds after the measuring range is modified.
ATEX mode only: C, W, A alarm thresholds can be set within the interval 0 % - 100 % FS.
Overrange indication is always active.
In the ATEX mode, the W and A relays coil is normally energized.
STEL and TWA Alarms
In the non-ATEX mode, with the measurement unit PPM, it is possible to set alarms based on
15 min (STEL) average calculation and/or on 8 h (TWA) average calculation.
STEL Average CALCULATION
Average value of last 15 measurements (any negative values are considered as 0 ppm).
The value of the STEL average will be available after 15 min from start-up. The sampling time for
the calculation is 1 min.
TWA Average CALCULATION
Average value of last 480 measurements (any negative values are considered as 0 ppm).
The value of the TWA average will be available after 480 min (8 h) from start-up. The sampling
time for the calculation is 1 min.
OVERRANGE
The OVERRANGE function indicates when 103 % of the full scale is exceeded. Refer to the status
of alarms and outputs depending on the unit configuration below: