Specifications

Multi-Zone Gas Monitors
P/N: 3015-5074 Rev 10 21
2.9. Optional Current Loop Interfaces
NOTE: The two-output, current loop interface is an option that MUST be ordered
separately.
2.9.1. Optional 4–20 mA DC Outputs
Upon installation of the optional 4–20 mA DC Interface Board (P/N 3015-5152), the MZ has the capability of
providing dual 4-20 mA DC scrolling current loop outputs for connection to external monitoring devices (e.g.,
a local loop-powered display or a building management system [BMS]).
IMPORTANT: Loop outputs are powered internally. Do not use an external power supply
as this can damage the loop card.
NOTE: Optional remote loop-powered displays are available to view the 4-20 mA outputs.
The interfaces are set up as follows:
• Loop 1 indicates zone area
• Loop 2 indicates PPM.
The 4-20 mA outputs are scaled to correspond to individual zone numbers and PPM concentrations.
Scaling for the 16 (maximum) zone numbers is fixed (see table below). The default scaling for the PPM
concentrations provides a 0-1000 PPM range for the 4-20 mA output, although it can be adjusted through
the LOOP2 FACTOR option in the SYSTEM SETUP screen. Refer to the tables below.
Loop 1 = Zone Loop 2 = PPM (Default: 0.016 mA DC = 1 PPM)
Output Zone Output PPM (Default)
4 mA DC n/a 4 mA DC 0 PPM
5 mA DC
1
5 mA DC
63 PPM
6 mA DC
2
6 mA DC
125 PPM
7 mA DC 3 7 mA DC 188 PPM
8 mA DC 4 8 mA DC 250 PPM
9 mA DC
5
9 mA DC
313 PPM
10 mA DC 6 10 mA DC 375 PPM
11 mA DC 7 11 mA DC 438 PPM
12 mA DC 8 12 mA DC 500 PPM
13 mA DC
9
13 mA DC
563 PPM
14 mA DC 10 14 mA DC 625 PPM
15 mA DC
11
15 mA DC
688 PPM
16 mA DC 12 16 mA DC 750 PPM
17 mA DC 13 17 mA DC 813 PPM
18 mA DC
14
18 mA DC
875 PPM
19 mA DC
15
19 mA DC
937 PPM
20 mA DC 16 20 mA DC 1000 PPM