Teledyne 6020 Operating Instructions Manual page 20

2 Installation
Threshold Alarm 2:
System Alarm:
Digital Remote Cal Inputs
Remote Zero and Span Inputs: The REMOTE SPAN and RE-
MOTE ZERO inputs are on the DIGITAL INPUT terminal block. They
accept 0 V (OFF) or 24 V dc (ON) for remote control of calibration (See
Remote Calibration Protocol below.)
Zero: Floating input. 5 to 24 V input across the + and – terminals
puts the analyzer into the ZERO mode. Either side may be
grounded at the source of the signal. 0 to 1 volt across the
terminals allows ZERO mode to terminate when done. A
synchronous signal must open and close the external zero
valve appropriately. See Remote Probe Connector at end of
section 3.3. (With the -C option, the internal valves automati-
cally operate synchronously).
Span: Floating input. 5 to 24 V input across the + and – terminals
puts the analyzer into the SPAN mode. Either side may be
grounded at the source of the signal. 0 to 1 volt across the
terminals allows SPAN mode to terminate when done. A
synchronous signal must open and close the external span
valve appropriately. See Remote Probe Connector at end of
section 3.3. (With the -C option, the internal valves automati-
cally operate synchronously.)
Cal Contact: This relay contact is closed while analyzer is spanning
and/or zeroing. (See Remote Calibration Protocol below.)
2-6: Part I
• Can be configured as high (actuates when concen-
tration is above threshold), or low (actuates when
concentration is below threshold).
• Can be configured as fail-safe or non-fail-safe.
• Can be configured as latching or nonlatching.
• Can be configured out (defeated).
Actuates when DC power supplied to circuits is
unacceptable in one or more parameters. Permanently
configured as fail-safe and latching. Cannot be de-
feated. Actuates if self test fails.
To reset a System Alarm during installation, discon-
nect power to the instrument and then reconnect it
Further detail can be found in chapter 3, section 3-5.
Teledyne Analytical Instruments
Model 6020