Dynon Avionics EMS-D120 Installation Guide - Manual (Page 32)

Transducer Installation
nut from the stud on the coolant temperature sensor. Slip the ring terminal onto the stud and
secure the nut over it. Connect the other side of the 1kΩ resistor (color bands: brown, black,
black, brown, brown; connect in either direction) to the 5V Excitation Circuit, pin 18, as shown
in the diagram.
Rotax Coolant Temperature Sensor: Wire the coolant temperature sensor in the same way as
shown above for the Dynon-supplied sensor. Configure the Sensor Type as 4, as shown on page
5-17.
GENERAL PURPOSE TEMPERATURE SENSOR
You may connect an OAT probe and configure it as a general purpose temperature measurement
(e.g., for cabin temperature). Refer to the Outside Air Temperature Sensor section on page 3-13
for installation information and to the General Purpose Temperature section on page 5-18 for
configuration information.
Contacts
Dynon Avionics does not sell contacts or switches.
Contacts are used for a variety of purposes, such as
monitoring canopy closure. The EMS firmware reads
the state of two contact inputs, reporting whether each
input is open (no connection to ground) or closed
(connection to ground). You may connect up to two contacts you would like to be monitored by
the EMS-D120. You must ensure that when closed, the contact connects to a ground common to
the EMS-D120. The voltage on the contact inputs must not exceed 15V.
Color Function Pin
9 Brown/blue Contact 1
10 Brown/yellow Contact 2
The Contacts Configuration section on page 5-19 describes the details of configuring the
contacts, including giving them custom names.
3-18 EMS-D120 Installation Guide
If more than two contacts are needed, the optional HS34 includes four additional
contacts. Connection and configuration of HS34 is the same as for contacts connected
directly to the EMS-D120.
General Purpose Thermocouple
You may configure the EMS-D120 to monitor one J or K
type thermocouple. Dynon Avionics does not sell a specific
general purpose thermocouple probe for this purpose.
However, our standard EGT and CHT probes will work, as
will any other J or K type thermocouple.
Pin Color Function
27
Not
supplied
Dynon Avionics sells both J and K type thermocouple wire
which may be used to connect the desired thermocouple to
the EMS-D120. Ensure you order the correct wire type for
the thermocouple you intend to use. Crimp a female D-sub pin on the end of each wire, and plug
them into the D37 connector. Polarity is important, so ensure that you are routing the positive
side (yellow for K-type; white for J-type) of the thermocouple to pin 27 on the 37-pin harness,
and the negative side to pin 28.
Thermocouple
+ (yellow or
white)
28
Not
supplied
Thermocouple
– (red)