Product Overview

6 EP-8000 Series Electro-Pneumatic Transducers Product/Technical Bulletin
N.O.
N.C.
TV-1
Reheat Valve
DA-1
O
O
S
S
Temperature Sensin
g
Element
Electronic
Controller
A-4000-137
Inline Filter
Air
Intake
D-3000 Series
Damper Actuator
EP-8000
Hi
g
h Volume
E/PT-2
EP-8000
Hi
g
h Volume
A-4000-137
Inline Filter
E/PT-1
S
20
Figure 14: Application Using High-volume EP-8000s to Drive Valve and Damper Pneumatic Actuators
C
alibration
To change the zero and span settings to values other
than the factory settings (Table 1), see Figure 2 for
adjustment locations and proceed as follows:
1. Determine the desired high pressure output (P
H
)
and, depending on the model chosen, determine
the corresponding input voltage (V
H
) or input
current (I
H
).
2. Determine the desired low pressure output (P
L
)
and the corresponding input voltage (V
L
) or input
current (I
L
).
3. Calculate the sensitivity using one of the
equations below:
Voltage models:
S
PP
VV
V
HL
HL
=
−
−
Current models:
S
PP
II
I
HL
HL
=
−
−
4. Determine if the calculated sensitivity from
Step 3 is within one of the ranges below:
Voltage models: 1.33
≤
S
V
≤
2.33
Current models: 0.6
≤
S
I
≤
1.0
If the calculated sensitivity does not fall within these
limits, the desired span cannot be obtained. Reselect
new desired values in Steps 1 and 2. Repeat
Steps 3 and 4.
5. Determine if the zero setting is within one of the
adjustment ranges below:
Voltage models: –6
≤
P
L
– (V
L
x S
V
)
≤
+6
Current models: –6
≤
P
L
– (I
L
x S
I
)
≤
+6
If the zero setting does not fall within one of these
limits, the device cannot be zeroed. Reselect new
desired values in Steps 1 and 2. Repeat
Steps 3 through 5.
6. Remove the cover from the unit by gently prying
up on the two snap-in cover tabs.
7. Connect filtered 20 psig (140 kPa) supply
pressure to the supply “S” connection on the unit.
(Low-volume models require a 0.007 inch
restrictor.)
8. Connect a JC 5361 Hypodermic Needle Test
Probe Assembly with a 0 to 30 psig (0 to 210
kPa) G-2010 Series Air Pressure Gauge (both
items ordered separately) to the hypodermic
needle test point on the unit.
Note: In areas where use of a hypodermic
needle test probe is prohibited, an output
test port can be installed on the output
side of the unit.