CiDRA GVF-100 Gas Volume Fraction Monitoring System - Manual (Page 54)

Copyright © 2006 CiDRA Corporation Page 9-3
20639-01 Rev 03
PULSE – An isolated solid-state switch-closure-type output occurs
between P+ and P- whenever conditions are met that are determined
by the pulse setting within the transmitter. The maximum applied
voltage between P+ and local ground and P- and local ground shall be
within the range of +30V / -10V. The load current shall be a maximum
of 100mA. Typical turn on time is 1 msec. Typical turn off time is 0.1
msec.
Figure 45 Pulse Switch Closure
For sizing R
1
refer to the following example.
Power Supply = 24V
Choose a value for R
1
so as to not exceed 100mA
R
1
= 24V / 100mA = 240 Ω
Therefore, R
1
should be sized to be greater than
240 Ω so the current does not exceed 100mA
ALARM – An electrically isolated switch closure occurs between AL+
and AL- whenever the limits specified in the transmitter setup for
Alarm are met. These limits can be changed or disabled through the
local keypad and display. The maximum applied voltage between
AL+ and local ground and AL- and local ground shall be within the
range of +30V / -10V. The load current shall be a maximum of
100mA.
Figure 46 Alarm Switch Closure
AL+ (HI)
AL- (LOW)
Solid-State
Relay Closure
Transmitter
Terminal Board
+ Out
- Out
R
1
Power
Supply
P+
P-
To Counter
Inputs
+
-