Compaq MTEK6000 - Manual (Page 21)

MTEK6000 SERIES USER'S MANUAL
January 2002 2-11
Volume and Alarm Pulse Specifications
1. All pulse outputs are isolated from
ground and each other. Provides 1,500
volts between input and output and
between contact sets.
2. Form C: DC load only, 125mWdc max,
50Vdc max
Form A: AC or DC load 800mW max,
400V max., 100mA max, continuous
3. Configurable pulse width from 1 to 5,000
milliseconds (ms).
Uncorrected Mechanical Pulse Output
(Units with a Metretek Index)
The uncorrected mechanical pulse output is
derived from the Form C reed switch in the
index assembly. As the magnet in the drive's
assembly rotates past the Form C switch, a
single uncorrected volume pulse output is
generated. Volume per pulse is determined
by the drive rate. Each uncorrected volume
pulse is equal to the gas flow for one shaft
revolution.
The pulse output can be wired as a Form A or
Form C switch output. Use terminals 25
(normally open), 24 (common) and 23
(normally closed) for Form C output. To
wire as Form A, use terminals 25 (normally
open) and 24 (common) and make no
connection to terminal 23 (normally closed).
The duration (width) of each pulse is equal to
the length of time the reed switch is in its
closed position (depends on the rate of the
meter). No configuration is necessary to
enable the uncorrected mechanical pulse
output.
Uncorrected Pulse Output Specifications
1. 3W contact rating (power dissipation).
2. Maximum switching voltage up to 30V.
3. Maximum switching current up to 200mA.
4. Maximum continuous current @ 500 mA.
NOTE
All pulse outputs are disabled in the standard
unit to conserve power. The Alarm pulse
output is a one time pulse output signal. No
other alarm pulse will be generated until the
alarm is cleared and becomes active again.