Operator Manual
Page
4
of
40
P/N 1580281
SEC3120 Digital Transmitter
Sensor Electronics Corporation
Rev 10, 20150707
1.
GENERAL DESCRIPTION
SEC3120 Dual-Sensor Display
The SEC3120 Dual transmitter is designed to interface with two sensors and can be used with the SEC5000
IREvolution®, SEC Millenium®, SEC Signature® infrared gas sensors or SEC3000 and SEC3300 toxic gas
detectors. The SEC3120 is a multi-microprocessor based intelligent transmitter continuously monitoring
information from the gas sensor(s). The LCD of the SEC3120 displays the gas concentration(s) and sensor
status(s). The SEC31
20 has one (1) “Alarm” LED and one (1) “Status” LED. The SEC3120 also has three
(3) magnetic switches located around the circumference of the unit. This manual will describe the operation
and use of the SEC3120 transmitter.
Features
Explosion Proof
Back lighted LCD Display
Low Cost
Plug and play toxic, oxygen and combustible gas sensors
Self-check system
4-20 mA sensor pass-thru output
RS-485 Interface (Isolated), as a Modbus RTU Slave
Optional alarm and fault relays
Non-intrusive programming
Non-intrusive calibration
Removable, non-volatile, time stamped data logging
Optional IS barrier
Digital communication link to SEC Gas Detectors
Multi-port housing for easy installation
2.
APPROVALS / CERTIFICATIONS
North American (c/us) Certificate:
Class I, Division 1, Groups B,C,D, Temp T5
IECEx (International) Certificate:
Ex (d) IIC, T5 Gb; IECEx CSA 13.0026
The SEC3120 is approved to the standards shown in the approvals certificates. In order to maintain
compliance to these standards install the SEC3120 per the following instructions and precautions.
3.
SPECIFICATIONS
The following specifications are for the SEC3120 display only. Consult the appropriate sensor manuals
for their specifications.
For use with (up to two):
-
SEC 3000 and 3300 Toxic and Oxygen gas sensors.
-
SEC 5000 IREvolution infrared sensors
-
SEC Millenium infrared sensors
-
SEC Signature Series infrared sensors
Environmental:
The SEC3120 Dual Sensor Display can be installed in indoor, outdoor and wet locations. The housings
have ingress protection ratings of IP66. Pollution degree 2 and Overvoltage category II
Operating Temperature and Humidity Rating:
