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Description
The DE20 digital temperature control is a micropro-
cessor based device that operates one relay. The
relay’s contact state is indicated as SET POINT on the
front panel.
The temperature sensor (i.e. RTD or thermocouple)
sends a signal to the DE20 controller. The DE20 com-
pares this signal to a value, determined by the operator
and set in the control’s memory for the SET POINT. In
the heating mode if the sensor signal is lower than the
set point value, the DE20 energizes the relay and its
isolated contacts close.
The DE20 is also equipped with an “ALARM CONDI-
TION” feature. This feature is activated by using the
“F3” parameter (described on page 13). The DE20
enters an “ALARM CONDITION” any time the sensor
signal has exceeded the ALARM SET POINT. Under
this condition, the DE20 de-energizes the relay and
the letters “AAA” flash on the LED display.
Installation
Suitable for indoor use only.
Unpack and inspect the controller for damage upon
receipt. Any shipping damage claims must be made
through the freight carrier that delivered the controller.
Remove the rear cover and inspect the controller for
internal damage.
Remove the panel retaining collar by inserting a flat
head screwdriver under the collar on alternating sides
while sliding the collar back.
Retaining collar
Retaining
collar screws
Cut a 1/8 DIN finished opening: 1.750"
x 3.625" (44 mm x 92 mm) in the panel
where the DE20 is to be mounted.
Remove the rear cover. Select from the four (4) knock-
outs on the rear cover that which offers the most con-
venient routing for external wiring. Remove the knock-
outs before reattaching the rear cover or inserting the
control in the panel.
Insert the DE20 through the prepared opening and slide
the retaining collar over the case from the rear of the
panel. After hand tightening the collar, tighten the two (2)
collar screws to ensure a secure fit.
Install a suitable liquid tight conduit fitting through the
knockout opening following manufacturer’s instruc-
tions and install field wiring. Using the wiring dia-
gram supplied with the controller, install the required
input and output wires. Use National Electric Code
and local codes for determining wire sizing, insula-
tion, terminations, etc.
3/16 (4.6)
2 5/8
(66.6)
This setting may be a zero (0) or a one (1). When set to zero, the alarm set point is turned off. When set to one,
alarm set point is turned on.
Note: The default value for this setting is zero (0).
This setting may be set to a zero (0) or a one (1). When set to one (1), the DE20 will display either a “C” or an
“F”, separated by a decimal point. This indicates that either Celsius or Fahrenheit is being displayed. If the
temperature being measured is greater than +999 degrees, the units are not shown because the display is
limited to four positions.
This setting may be set to a zero (0) or a one (1). When set to a zero (0), the temperature is displayed in
degrees Fahrenheit. When set to a one (1), the temperature is displayed in degrees Celsius.
Conversion from F to C does
NOT
change set point or alarm upper limit values. These must be changed
manually.
Note: The default setting is zero (0).
Not available.
When using the sensor 5415 board, an “on-board” DIP switch must also be configured. The DIP switch
settings are as follows:
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F3, Alarm On/Off Switch
F4, Unit Display Enable Flag
F5, Temperature Units Conversion
F6, Current Output Enable Flag
Sensor DIP Switch Settings
Sensor DIP Switch:
Selections
Sw1
Sw2
Sw3
Type
OFF
OFF
OFF
1000 ohm RTD
ON
OFF
OFF
100 ohm RTD
OFF
ON
OFF
voltage
OFF
OFF
ON
current
OFF
OFF
OFF
frequency
(Illustration shows DIP switch setting for 100 ohm RTD.)
Electrical Noise and Interference
Process Technology electronic controls are engineered, tested and manufactured to conform to Europe’s CE
levels of electrical noise and interference found in typical industrial installations. It is always possible for
electrical noise and interference to exceed the level of designed-in protection. This can happen, for example,
if arc or spot-welding equipment is close to the control or if they share a common power line. It can occur if
M-33-01-02 02/17/11
M-33-01-02 02/17/11
WARNING: Avoid damaging DE20
components. Remove rear cover before
removing knockouts with a hammer/punch.
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