Microair Avionics
EC2002 Altitude Encoder
16
th
April 2010
EC2002 Installation Manual 01R12.doc
Page 5 of 16
2.0
DESCRIPTION
The EC2002 is housed in a 1mm black anodised case, with
a mounting flange at each side.
Fitted to one end of the case are a DB15 male connector for
all electrical connections and a female 1/8” NPT fitting for
connection to the aircraft’s static air pressure system. At the
opposite end is the nameplate showing the compliance
statements, the part number, serial number, and mod status.
The top of the case is fitted with a label which has the pin
assignments for the DB-15 connector, and clearly identifies
the NPT fitting. There are two holes in the top of the case to
access the HIGH and LOW keys. These keys are used in the
calibration of the EC2002, and are clearly marked on the
top cover label.
The EC2002 is fitted with a sensitive pressure transducer to
sense the air pressure present at the NPT fitting. The
transducer output is “digitised” into a numerical value and
outputted as an altitude via the 10 line Gillham interface and
simultaneously to the serial data interface. The EC2002 will
typically start outputting altitude data 10 seconds after being
turned on.
The maximum calibration range is between -1000 feet and
+35,000 feet. The
HIGH
and
LOW
keys provide an offset to
adjust the outputted altitude value up or down in 25ft steps.
The EC2002 is temperature controlled to ensure the pressure
transducer is at nominal temperature, in an ambient
temperature range of -20 to +55 degrees C. A heater element
maintains the pressure transducer core temperature within
operational specification. Power consumption with the heater
element off is 10mA, and a maximum of 100mA @ 14V or
200mA @ 28V with the heater element on. The heater will
be fully off when ambient air temperatures are above 15
degrees C.
IMPORTANT NOTE
The EC2002 will cease outputting altitude data if:
1.
The pressure altitude goes above 35,000 feet
2.
The pressure altitude drops below -1000 feet
3.
The sensor temperature is not within operational range
