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3.4 On-Board Sensors
The specifications for the on-board sensors of the Model 923-EDL card are given in section 2.0 of this document.
The 923-EDL obtains a new sample from the on-board sensors every 5 ms. Note that the accuracy of the
temperature and humidity is for the sensors themselves and corresponds to the immediate vicinity of the
sensors, which may deviate from the ambient air conditions inside the rotary product.
The card starts logging data at a user-defined log interval (1 to 120 minutes) as soon as it gets powered. After
power-up the card calculates the maximum, minimum and average values read from all the sensors during the
specified log interval and then saves this data to the on-board flash memory with a time stamp from the on-board
real-time clock (RTC).
The real-time sensor data and the sensor data saved in flash can be accessed (downloaded) from the
diagnostics port (J5) using the sample GUI (P/N: 923-0403-00) or using custom software configured as Modbus
RTU master. The real-time raw data (non-formatted) of the on-board sensors is stored in Modbus registers.
Refer to section 7.0 of this document for details on how to convert Modbus sensor raw data into
analog values for all the on-board sensors.
3.4.1 Temperature and Humidity Sensor
The card uses a capacitive type humidity sensor with integrated temperature sensor. A protective cap is placed
over the sensor.
Do not expose the sensor to solvents or other corrosive liquids.
3.4.2 3-Axis Accelerometer Sensor (Shock and Vibration)
The 3-axis accelerometer provides measurements up to ±200 g. This sensor measures both dynamic
acceleration resulting from motion or shock and static acceleration, such as gravity. Shock and vibration data
obtained from this sensor are saved in the on-board flash memory and also into Modbus registers. The X, Y and
Z direction raw values are stored as 16-bit values. The shock events are logged into the flash memory as 32
data points per axis (10 data points before the event and 22 data points after the event).
3.4.3 Ambient Light Sensor
The light sensor used is capable of operating in the infrared and visible light spectrum. Illuminance (ambient
light level) in lux is derived using an empirical formula to approximate the human-eye response.
The illuminance measured is stored as a 16-bit raw value in Modbus registers for real-time diagnostics and it is
stored as formatted data (lux) in the on-board flash.
Refer to the Modbus register map section of this document for details on the formulas to obtain the lux values.
3.4.4 Rotation Sensor (Turns Counter and Speed)
The on-board rotation sensor is used to measure the direction (CW and CCW), speed (rpm) and total revolutions.
This sensor requires custom hardware and is currently intended to be used with Focal rotary products. Contact
the factory for more details.
Focal Technologies Corporation
A Moog Inc. Company
Model 923 Data Logger – User Manual
Document No: 923-0603-01, Rev. 2
Page 3-4
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