Hach-Lange Sigma SD900 Portable - Manual (Page 79)

77
Wiring for non-Sigma flow meters
F
Program
complete
output
Green
Normally an open circuit, this line
switches to ground for 90 seconds at
the conclusion of the sampling program.
Used to “wake up” another sampler to
take over sampling or to signal an
operator or data logger upon the
completion of the sampling program.
This pin is also used to signal the bottle
full condition in a single
bottle/continuous mode, and will
transmit the bottle number to a flow
meter if the program complete signal
is disabled.
This is an open collector output with 18 V zener
clamp diode for overvoltage protection. The output is
active low with respect to common (pin B).
Absolute maximum ratings for output transistor:
Sink current = 25 mA DC maximum.
External pull-up voltage = 18 VDC maximum.
G Shield N/A
Provides connection to earth ground
when the sampler is powered using
AC power. This connection is only
intended for use in controlling RF
emissions and susceptibility.
Not intended for use as safety ground. Do not use as
a current carrying conductor.
Cables greater than 3 meters length connected to
the sampler auxiliary port should be shielded.
Regardless of length, if a shielded cable is
connected to the auxiliary port, the shield (drain) wire
should only be connected to earth ground at one end
of the cable to avoid ground loop currents.
1 Wire color refers to the colors of multi-purpose cables Cat. No. 8756800 and 8756900.
Table 8 Half-cable wiring information for non-Sigma flow meters (continued)
Pin
Signal
description Wire
color
1
Purpose Rating