Remote Veriication | 5-1
REMOTE VERIFICATION
The analyzer can be commanded to initiate Zero and Verify functions remotely via a 4-20
milliamp input into terminals 1 (+) and 2 (-) of TB3 (See Figure 3-11). The table below de-
scribes the analyzer response to a current input.
Input Analyzer Response
0 mA to 7.9 mA No action, all internal lags reset.
8mA to 11.9mA Abort Zero or Verify operation
12mA to 15.9mA Initiate Verify Cycle
16ma to 20mA Initiate Zero Cycle
A current level should be maintained for a minimum of 2 seconds for the analyzer to ac-
cept the command.
Once a command has been accepted, the current input must drop below 8 milliamps before
a subsequent command will be accepted.
For example, with an input level of 4 milliamps, a remote DCS raises the input to 14 mil-
liamps for 2 seconds. The analyzer will initiate a Verify Cycle. To abort the cycle, the input
must irst be lowered to less than 8 milliamps for two seconds, then increased to 10 milli-
amps for two seconds. Finally the input should again be dropped to less than 8 milliamps to
reset all internal lags before another remote command is accepted.
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