SMC sierra monitor corporation Sentry Instruction Manual - Version 6
APPENDIX J - REFERENCE DRAWINGS
Page: 107
8.9 APPENDIX I - MODEL 5100-90 8-CHANNEL
ANALOG-DIGITAL CONVERTER
8.9.1 DESCRIPTION
The 8-Channel Analog-Digital Converter can be used to
connect up to eight 4-20 mA sensor devices from Sierra
Monitor or other manufacturers to the Sentry controller.
8.9.2 INSTALLATION
1. Power down the system
2. Figure 8-6 shows the terminal connections for the 8-
Channel Analog-Digital Converter.
3. Connect 4-20 mA sensor inputs for each of the
sensors (up to 8) to channels 1 through 8 as indicated
• 3-wire connections should be P (Power), S
(Signal), G (Ground)
• 2-wire connections should be P (Power) and S
(Signal)
4. The channel number indicated by the connection on
the 5100-90 becomes the Sentry module address
number
• NOTE: Sentry digital input sensor modules on the
same controller must not have addresses which
duplicate addresses used on the 5100-90
5. Set select switches on the right side of the converter
to identify the sensor module type as follows:
Type Switch 1 Switch 2
Combustible OFF ON
Oxygen ON OFF
Toxic OFF OFF
Not Active ON ON
6. The Power/Comm Bus is located at the bottom of the
converter. Connect Power/Comm Bus to the Sentry or
an external 20-24 VDC Power Supply as follows:
Converter
Sentry External 20-24VDC
Power Supply
P1 Terminal 1
Channel 8 Power Supply
+VDC
S1 Terminal 2
Channel 8 Terminal 2
Channel 8
G1 Terminal 3
Channel 8 Terminal 3
Channel 8K
P2 Terminal 1
Channel 7 Power Supply
+VDC
G2 Terminal 3
Channel 7 Power Supply
Common
• NOTE: Converter terminals P1, S1 and G1
connect to one channel and P2, G2 connect to a
second channel. When an external power supply
is used, connect S1 and G1 to any single channel
on the Sentry
8.9.3 SERVICE
There are no serviceable components on the Analog-
Digital Converter. Contact Sierra Monitor for factory
service.