MZ-RD – Multi-Zone Remote Display
28 Instruction 3015-5157
From the top level Zone Screen press the key adjacent to the zone you wish to work with to first
display its Zone Setup Screen #1. Then press the TREND key at the bottom of the display to go
to the Trend Screen.
Trend Screen
The trend graph opens with the cursor located over the most recent data point. Use the
LEFT/RIGHT cursor keys to move the cursor to different data points. Holding a key down will
cause cursor to move rapidly across the screen. As you move the cursor position, the date and
time of that reading, along with the ppm value, are displayed at the top of the screen above the
graph. The trend graph is
automatically scaled to accommodate the largest ppm value displayed.
The ZOOM OUT and ZOOM IN options, located in the bottom corners of the screen, allow you to
adjust the vertical scale of the graph.
The trend data is stored on a first-in, first-out basis. After 100 trend values have been stored the
101
st
value will replace the first value stored. Therefore, in normal operation, when entering trend
mode the cursor will be located at the most recent data point. The data points to the left of the
initial cursor location will be the next most recent. The data point to the right will be the ol
dest
data point in the buffer and will be over written by the next data point.
4.8. System Faults
4.8.1. Functional Overview
If a system malfunction occurs, the gas monitor will detect the problem and cause its yellow
FAULT LED to glow. Additionally, an external alarm device may activate and an audible alarm
may sound if those features have been enabled.
The next time the MZ-RD polls the affected monitor its yellow FAULT LED will also glow.
Additionally, an external alarm device may activate and an audible alarm may sound if those
features have been enabled.
Depending on the nature of the fault, the gas monitor may or may not continue to operate
normally. Under a non-critical fault condition, the gas monitor will continue to measure and log
data, but some peripheral functions may be compromised. Under a critical fault condition, action
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