Product Overview

2 EP-8000 Series Electro-Pneumatic Transducers Product/Technical Bulletin
O
verview
The EP-8000 is designed to output a proportional
pneumatic control signal in response to an electronic
control signal. All units feature barbed air connections
for 5/32 or 1/4 inch O.D. polytubing. Sequencing of
pneumatic valve or damper actuators can be
accomplished using a Johnson Controls
V-9502 (Valve) or D-9502 (Damper) Actuator
Positioner.
O
peration
A change in the electrical input signal modulates the
amount of air that exhausts from the leakport,
producing an output pressure directly proportional to
the input signal. Input and output pressure and flow
relationships are detailed in Figures 3 through 5.
A potentiometer located next to the wiring terminal
block is provided for field span adjustment, and a
screw located on the side of the EP-8000 is provided
for zero adjustment. (See Figure 2 for adjustment
locations.)
The low-volume models are 1-pipe instruments, which
require a 0.007 inch restrictor (R-3710 Series, ordered
separately) in the supply air line.
+ -
Span Ad
j
ustment
Potentiometer
Wirin
g
Terminal
Block
Zero
Ad
j
ustment
Screw
H
y
podermic Needle
Test Point
Figure 2: EP-8000-1 Adjustment Points
(Cover Removed)
I
nput vs. Output Relationship
Input
(
volts DC
)
Output (psig)
0
0.524689
1
4
8
12
16
18
20
Figure 3: EP-8000-1 and -2: Input (volts DC) vs.
Output (psig)
Input
(
mA DC
)
Output (psig)
0
3
6
9
12
15
18
21
24
6 8 10 12 14 16 18 20
Figure 4: EP-8000-3 and -4: Input (mA DC) vs.
Output (psig)
mL/s scim
12 4 6 8 10
4812
16 20 mA
VDC
Input Si
g
nal
Output Flow Capacity
1800
1600
1400
1200
1000
800
600
400
200
0
491
437
382
328
273
218
164
110
55
0
Figure 5: High-volume Models: Input Signal (volts DC
and mA) vs. Output Flow Capacity (scim and mL/s)