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®
431-X instruments shipped after early 1995 are capable of providing 0-2 volts analog
output. Instruments shipped before that time can be upgraded by a firmware update and
adjustment.
Instruments can be upgraded to have 4-20 mA output
with the addition of the Option Functionality upgrade.
This must be performed at the factory.
Connection and Setup for 0-2 volt output:
•
0-2 volt devices connect as shown in Figure 1. If
the instrument includes the Option Functionality,
be sure its analog jumper is set as follows:
o
Non-SMV units: SW101 is set to the “V”
position. (Power off the instrument first if the
jumper needs to be changed.)
o
SMV units: JMP3 is set to pins 1&2. (Power
off the instrument first if the jumper needs to
be changed.)
Connection and Setup for 4-20mA output:
•
The 4-20 mA active receivers connect as shown in
Figure 2. The active receiver contains a voltage
source to power the loop current. The receiver
must have an isolated input circuit. That is, it
must not be connected to ground or to a voltage
source referenced to ground. Be sure that the
analog jumper is set as follows:
o
Non-SMV units: SW101 is set to the “I”
position before power is applied.
o
SMV units: JMP3 is set to pins 2&3 before
power is applied.
•
431X reading
Current
0.000mg/m3
4mA
1.000mg/m3
20mA
•
The 431X current formula is:
16mA
∗
Display R 4mA = (Current)
Example:
A reading of .100mg/m
3
would produce an output current of:
16mA
∗
0.1 +4mA = 5.6mA
JUMPER IS SET TO ‘V’ or 1&2
Figure 1
JUMPER IS SET TO ‘I’ or 2&3
Figure 2
