Bacharach MultiZone, Installation & Operation Manual, Page: 33 / 84

Multi-Zone Gas Monitors
P/N: 3015-5074 Rev 11 27
3.4.5. Zone Hold
Sets the length of time a zone will be monitored when the zone hold feature is activated. The default is 15
minutes. The range is 1 to 999 minutes.
1. Press the ENTER key to adjust this setting.
2. Use the LEFT/ RIGHT cursor keys to move across the entry field and the UP/DOWN cursor keys
to modify the individual numbers.
3. Press ENTE R to accept the new entry or ESC to revert to the previous setting.
3.4.6. Detection Limit
This is essentially a squelch setting that instructs the instrument to interpret PPM readings below the
designated level as 0. The range is 1 to 99 PPM.
1. Press the ENTER key to adjust the setting.
2. Use the UP/ DOWN cursor keys to modify the setting.
3. Press ENTE R to accept the new entry or ESC to revert to the previous setting.
3.4.7. Loop Mode
This sets the loop mode of the two optional 4-20 mA outputs. Options are:
•
track zones mode (default)
•
highest PPM concentration mode.
NOTE: B oth LOOP MODE (for selecting track zones or highest PPM mode) as well as the
LOOP2 FA CTOR (for scaling the PPM out put) are configured from the SETUP menu.
Configure one, then press ENTER to access the other.
In
track zones mode the MZ adjusts the ZONE and PPM out puts to correspond to the latest sampled
zone number and its corresponding PPM concent ration, respectively. For example, if the MZ samples
zone #9 at 63 PPM, the ZONE and PPM outputs would read 13 mA (corresponds to zone #9) and 5 mA
(corresponds to 63 PPM), respectively, until the next zone is sampled. This continues in a cyclic fashion
through each zone. Note that this example assumes LOOP 2 Factor was left at its default value (0.016).
This can be adjusted through the LOOP2 FA CTOR option in the SYS TEM SE TUP screen.
In highest concentration (PP M) mode the MZ adjusts the two current outputs to correspond to the zone
number that has the highest PPM concentration and the corresponding value of that concentration,
respectively. Unlike
track zones mode , this mode will adjust the two outputs to correspond to whichever
zone has the highest PPM concentration. For example, if zone #9 is sampled at 125 PPM, the two
4-20 mA outputs will read 13 mA and 6 mA, respectively, as long as it continues to sample at 125 PPM or
until a different zone samples a concent ration greater than 125 PPM.
3.4.8. Loop2 Factor
This sets the PPM scale factor for current loop number 2. After setting the loop mode, the menu box
changes to a lower-level menu that allows you to set the Loop2 Factor. To calculate the current output,
multiply the scale factor by the PPM and add 4. For example, at the default scale factor of 0.016, a
measurement of 100 ppm would generate a current output of 5.6 mA DC. The current output cannot exceed
the 20 mA DC capacity of the interface.
1. Press the ENTER key to adjust the setting.
2. Use the LEFT/ RIGHT cursor keys to move across the entry field and the UP/DOWN cursor keys
to modify the individual characters.
3. Press ENTE R to accept the new entry or ESC to revert to the previous setting.
NOTE: B oth LOOP MODE (for selecting track zones or highest PPM mode) as well as the
LOOP2 FA CTOR (for scaling the PPM out put) are configured from the SETUP menu.
Configure one, then press ENTER to access the other.