Introduction
BDS 3960
Teledyne Analytical Instruments
16
Access Drawer:
For access t o the BDS S ensor And pr essur e regul ator.
T he f ront panel sli des out when the four thumb screws ar e loosened.
Openi ng the int er ior gives access to most ci rcui t boards t oo.
1.5
Rear Panel (Equipment Interface)
The rear panel, shown in Figure 1-2, contains the gas and electrical
connectors for external inlets and outlets. The connectors are described
briefly here and in detail in Chapter 3
Installation
. Except for gas, AC
power, and RS-232 communications I/O, all user connections for analog
output, alarms, calibration and remote probe contacts are available
through the 50 pin equipment interface connector. User connections
made at the rear panel include:
•
Power Connection
110 VAC power source (220 VAC
optional.
•
Gas Inlet and Outlet
One inlet and one exhaust out.
•
Moisture By-pass
Additional vent line for condensate
•
Analog Outputs
0–1 VDC oxygen concentr ation plus
0-1 VDC r ange I D, and isolated
4–20 mA DC oxygen concentr ation
plus 4-20 mA DC range ID.
•
Alarm Connections
2 concentration alarms and 1
system alarm.
•
Remote Probe
Used in the BDS 3960 for
controlling external solenoid
valves only.
•
Remote Span/Zero
Digital inputs allow external
control of analyzer calibration.
•
Calibration Contact
To notify external equipment that
instrument is being calibrated and
readings are not monitoring
sample.•
Range ID Contacts
Four separate, dedicated, range
relay contacts. Low, Medium,
High, Cal.
