AW Gear Meters RT-15 - Manual (Page 13)

RT‐15 Flow Monitor
Operation and Programming Manual
12
A D 4 2 1
LO O P +
LO O P -
+
R se n se
V lo o p
A D 4 2 1
LO O P +
LO O P -
m A O UTPUT (3 - W IRE)
+ Vc c
SUPPLY N EGA TIVE
R se n se
+ -
(Lo o p Po w e r fro m RT- Ex 1 5 D C Su p p ly)
m A LED m A LED
R se n se = 2 5 0 O h m m a x . @ 1 2 - 1 5 Vd c
R se n se = 5 0 0 O h m m a x . @ 1 5 - 2 7 Vd c
1 2 - 2 7 Vd c
R se n se = 2 5 0 O h m m a x . @ 1 5 Vd c
R se n se = 5 0 0 O h m m a x . @ 2 4 Vd c
m A LO O P O UTPUT (2 - W IRE, Is o la t e d )
N O TE: Se p e ra t e s u p p ly vo lt a g e s t ill re q u ire d
fo r RT- Ex 1 5 o p e ra tio n .
Programming on page 26 for information regarding displaying and programming the limit and pulse
output.
Analog Output
The isolated 16‐bit 4‐20mA output can be wired in a two‐wire loop‐powered arrangement, or loop
power can be supplied via the DC supply as shown in the wiring examples below.
A separate power supply is required to operate the RT‐15 even if the analog output is used in a loop‐
powered configuration.
The mA LED lights with varying intensity in proportion to the mA output for troubleshooting purposes.
The assignment, offset, and scaling values for the mA output are programmable. See ANALOG OUT
Programming on page 24 for information regarding setting up analog output.
Frequency Input Test Point
The RT‐15 has a frequency input test point allowing you to input a frequency signal directly. This is
especially useful for setting up and testing pulse output or analog output signals during commissioning
when flow is not present or where it is not feasible to allow continuous flow for setup and calibration
purposes. You must change the position of a programmable jumper to use the test point input. See the
test points and jumper positions in the diagram below.
Change the jumper back to the correct position before beginning normal operation using the sensor
nose.
Test Point Input Specifications
 Waveform: DC signal ‐ pulse, square‐wave, triangle, or sawtooth.
 Minimum signal amplitude: 2 Volts peak.
Notice
Caution