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AEROSPACE & DEFENSE
FEATURES
3 The first modern, digital,
humidity sensor
3 Standard D38999 electrical
connector
3 CANBUS output
3 Internal Built-In Test
3 Provides both humidity and
temperature
Humidity Sensor 8TJ315AAA1DESCRIPTIONAMETEK has now developed the most accurate and smartest humidity
sensor available for aircraft Environmental Control Systems (ECS).
Qualification is completed for a transport jet application. The humidity
sensor contains the sensing element and the electronics to convert the
water concentration in air to a standard CANBUS output.
The humidity sensor uses a capacitance technique with specialized signal
processing to measure water content. It is intended for an air ducting
installation where humidified air is carried to seating areas. Time response
is a function of airflow and typically is less than six seconds. The
CANBUS output has labels of duct humidity and temperature
and Built-In-Test status.
Internal Built-In-Test (IBIT) capability indicates detected
failures both with sensor and its internal processing
circuits and microcontroller.
The humidity sensor has passed tests in
accordance with DO160, substantiating
all the requirements for its location on
transport aircraft.
PRINTED IN THE U.S.A. © 2013, BY AMETEK, INC. ALL RIGHTS RESERVED. 1M913PDF (020198)
HEADQUARTERS50 Fordham Road • Wilmington, MA 01887 U.S.A. E-mail: [email protected]
AEROSPACE & DEFENSE www.ametekaerodefense.com
SALES: North America Tel: +1 978-988-4771 • Fax: +1 215-293-8995
EuropeTel: +49 8145 951767 • Fax: +49 8145 951768
Asia PacificTel: +65 6484 2388 (ext 118) • Fax: +65 6481 6588
A
B
CD
E F
ELECTRICAL/FUNCTIONAL INTERFACECONNECTOR PART NUMBER: D38999/25YB98CN
ABCDEF
PIN28VDC POWER---
DC GND---CAN HIGH---CAN LOW---
N/C---CASE GND---
3.17 ±.04(80.52 ±1)
3.00(76.20)
IMMERSIONDEPTH
.50(12.70)
MARKING LOCATIONAROUND CIRCUMFERENCE
NUT CAP
Ø.69(17.501)
MAXIMUM
.42(10.70)
M20 x 1.5 THREAD (fine)
5.51 +.04/-.09(139.93 +1/-2.30)
1 .00(25.4)
ACROSSFLATS
3X
1.18(30.0)
MAXIMUM
TEMPERATURE/ HUMIDITYSENSORWITH CAN BUSINTERFACE
IN(mm)
Humidity Sensor 8TJ315AAA1SPECIFICATIONS
DIMENSIONS
PERFORMANCE CHARACTERISTICS
Range: 10 to 90% humidity
Accuracy: ± 4% from 0°C to 50°C humidity 1.5°C from 0°C to 40°C temperature
Time Response: <40 seconds @ low flows, <10 seconds @ 45 feet/second
Input: 18 to 32 VDC
Current: 32 milliamp, nominal
Output: CANBUS label outputs for humidity, temperature, and BIT
Operating Temperature: -55°C to +85°C (-40°F to 158°F)
PERFORMANCE CHARACTERISTICS
Weight: < 0.44 lbs.
