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OM-50 Series data loggers record
when devices change between on
and off or open and closed states
and store the time, date and state
for each change (the black arrows
in the diagram below show when
data is recorded).
These data loggers have two LED
indicator lights, one red and one
green. One of these LEDs will blink
every two seconds. If the contact is
open or the device is off, the red
LED will blink. If the contact is
closed or the device is on, then the
green LED will blink. Although the
LEDs blink every other second, the
state is checked every half second,
with state changes recorded as
detected. Simply connect the
data logger to your PC using the
RS-232 cable and download stored
data using the Windows software.
Model OM-51 State Data logger has
two inputs, a magnetic reed switch
located in the middle of the hinge of
the case (opposite the connectors),
and an external contact closure
input. The data logger records
contact closures/openings of its
internal magnetic reed switch and
contact closures (open/shorted)
in a cable connected to its 2.5 mm
stereo jack. The OM51 data logger detects the
cable's open/shorted condition by
applying a positive voltage pulse to
the tip (white wire in the cable).
Model OM-52 Motor On/Off
Datalogger uses an AC magnetic
field threshold sensor to determine
if a motor is on or off. The AC
magnetic field threshold is
approximately 2 Gauss at 60 Hz.
Position the logger so that its green
LED blinks when the motor is on.
is usually best to mount the
data logger on the side of the motor.
Model OM-53 Light On/Off
Data logger has a light intensity
threshold that is adjustable from
approximately 10 to 100 lumens.
The threshold is adjusted by
turning a light sensitivity control
on the front of the data logger.
The OM-53's light sensitivity is
peaked in the forward direction as
shown in the light sensor angular
response plot (see PDF file of detailed specifications).
This directionality can be taken
advantage of to minimize the
effect of other light sources when
trying to determine the on/off
state of a particular light source.
The light sensor is on the side of
the case next to the green LED.
Note, however, that the sensor
detects light directed at the front
of the case.
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MEASUREMENT SPECIFICATIONS
OM-51 STATE DATA LOGGER
Inputs: two inputs;
a magnetic sensor mounted in the
datalogger and an external cable for
detecting contact closures (external
cable is included).
Spacing Between Data logger
and
External Magnet:
closed, less than or equal to 3/4";
open, greater than or equal to 3/4"
(external magnet is included)
External Contact Input:
passive relay switch or contact
closure
OM-52 MOTOR ON/OFF
DATA LOGGER
Sensor Type:
AC field sensor Magnetic Field
Threshold: approx. 2 Gauss at 60
Hz; the logger will typically work
with AC motors drawing 1A or more
Mounting:
mount the data logger on or close
to the motor housing or to one
phase of the power line to the
equipment being monitored
Angular Response:
the datalogger is sensitive
to that part of the AC field that
is perpendicular to the
data logger's face
OM-53 LIGHT ON/OFF
DATA LOGGER
Light Threshold Adjustment
Range:
approx. 10 to 300 foot-candles
(fluorescent light); the data logger's
sensitivity to incandescent light is
about ten times greater (see plot in the
PDF)
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GENERAL SPECIFICATIONS
Measurement Capacity:
2000 state changes
Time Resolution: 0.5 seconds
Minimum State Duration:
0.5 seconds
Memory Modes: stop when full,
wrap-around when full (user
selectable)
Memory: non-volatile
EEPROM memory retains data
even if battery fails
Operation: blinking LED lights
show current state
Time Accuracy: ±1 minute per
week at 20°C (68°F)
Operating Temperature:
-20 to 70°C (-4 to 158°F)
Operating Humidity:
0 to 95% non-condensing
Storage Temperature:
-20 to 70°C (-4 to 158°F)
Power: 3.6 V lithium battery
Battery Life: 1 year
Dimensions:
2.4"H x 1.9"W x 0.8"D
(68 x 48 x 19 mm)
Weight: 1 oz (29 g)
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† All dollar amounts on this site are shown in US currency.
Note: Data loggers are supplied with complete operator's manual and mounting kit (hook/loop, magnet and tape). Model OM-51 State Data logger includes external magnet and external input cable for detecting contact closures.
Ordering Example: (1) OM-51 State datalogger = $72
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Keywords:Portable Low Cost Data Loggers Part of the NOMAD® Family
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