Teledyne LGA-3500 - Laser Gas Analysis system - Manual (Page 34)

Installation Model 3500
Teledyne Analytical Instruments 20
radiation to the process. In these models, the laser diode is located in the
central processing unit, and the laser output beam is sent to the
transmitter unit through optical fiber. The electrical connections are
slightly different between the two models as shown in Figures 3.7 and
3.8. These figures show the connection ports on the central processing
unit for non fiber optic unit (Figure 3-7) and the fiber optic unit (Figure
3-8). Both instruments use 250V/2A fuses.
The Model 3500 provides input, output, and communication ports
on the bottom of the central processing unit enclosure. The following
input/output/communication signals are supported:
Output: 3-channel relay alarm output
1 4-20mA gas concentration output
Input: 2 4-20mA pressure and temperature input
Comm: 1 channel RS232/GPRS port for communications
with PC.
The input and output signal lines are connected to the motherboard
inside the central processing unit via a connection socket. Table 3.1
shows the specific electric connection for different input and output
signals. Customers may choose to connect these signal lines according
to their needs.
Figure 3.7 Electric Connection Ports on the Central Processing
Unit for Non-fiber Optic Analysis Systems.
1. Grounding pole
2. RS232 connection port
3. Cable port between the
central processing unit and
the probe
4. 4-20mA connection port
5. Relay connection port
6. Fuse socket
7. Power supply port