Omega Vehicle Security PX791 - Manual (Page 4)

Vent Tube
The cable will have a clear Teflon vent tube that's
required at pressure below 500 psi to provide
atmospheric reference. The open end should be
placed in a dry area.
Life Support Policy
These products are not authorized for use as
critical components in life support devices or
systems. As used herein:
1. Life support devices or systems are devices or
systems which, (a) are intended for surgical
implant into the body, or (b) support or sustain
life, and whose failure to perform, when prop-
erly used in accordance with instructions for
use provided in the labeling, can be reasonably
expected to result in a significant injury
to the user.
2. A critical component is any component of a life
support device or system whose failure to per-
form can be reasonably expected to cause the
failure of the life support device or system, or
to affect its safety or effectiveness.
D
B
C
A
PX791 & PX792 Series
Dimensions
MODEL A B C D SERIES
S15 0.8 4.7 0.9 2.0 PX791
S20 0.8 4.7 0.9 2.5 PX792
Loop Supply Voltage vs.
Loop Resistance
for 4-20mA Output Only
Loop Supply Voltage (Vdc)
V
min
= 10V + [.022A*(R
L
)]
*includes a 10% safety factor
R
L
= R
S
+ R
W
R
L
= Loop Resistance (ohms)
R
S
= Sense Resistance (ohms)
R
W
= Wire Resistance (ohms)
Loop Resistance (Ohms)
1000
750
500
250
0
0 36 20 10
1182
30
Figure 1. Loop Supply Voltage vs. Loop Resistance