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OM-70 Family of Loggers
The OM-70 family of loggers comes in four different versions.
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OM-71 records temperature using an internal sensor. The unit can record up to 43,334 temperature values.
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OM-72 records temperature using an external sensor. The unit can record up to 43,334 temperature values.
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OM-73 records temperature and humidity values using an internal sensor. The unit can record up to 21,672
temperature and humidity values, or 43,334 temperature only values.
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OM-74 is a single channel thermocouple logger. The logger supports most widely used thermocouples:
K, J, E, N, T, S, R, B and C. The user can change the thermocouple type during logger setup through the
PC. The OM-74 memory can record up to 32,638 temperature samples. The OM-74 logger requires 3
AAA batteries to operate. The batteries last 2 years under normal use.
The loggers feature a display that allows the user to see the current reading and the reading values stored in the unit's
memory. The display also shows the current date and time, the battery level, whether or not the device is collecting
data and the alarm condition. The OM-73 display alternates between temperature and humidity.
The OM-71 and OM-73 sensors are open to the air. It is therefore important to ensure that water does not get into
the unit. This is especially important in high humidity situations (90% RH and above) where water may condense
inside the logger, causing damage to the internal electronics.
The OM-72 sensor is condensation resistant, but should not be submerged in liquid for an extended period of time.
The OM-74 thermocouple sensor can be used in any environment compatible with that thermocouple.
OM-74 Warning
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To avoid the risk of electrical shock and equipment damage, avoid using
grounded or exposed thermocouples when there is a possibility that the
thermocouple tip will touch surfaces on which voltage may be present with
respect to ground. Examples of such surfaces include heating elements and
poorly grounded conductive surfaces, such as metal pipes. When there is a
possibility that a grounded or exposed thermocouple tip will touch a surface with
a voltage potential, do not connect the logger to a computer while the
thermocouple is connected. Damage to your computer may occur if the
thermocouple tip touches a surface with a voltage potential while the OM-74 is
connected to your computer.
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To avoid electrical shock, remove the thermocouple from the measurement
surface, or disconnect the thermocouple from the instrument before replacing the
batteries.
Turning the Loggers On and Off
To conserve battery life, when the unit is not logging and no buttons are pressed, the logger will turn itself Off after
about 1 hour of operation. The display will go blank and the unit will enter a power save mode. In this mode the
logger uses practically no power, and the battery will last as long as its rated shelf life.
To turn the logger On at any time, just press any of the logger's buttons. The display will come back On and the
logger will operate normally.
Summary of Contents for OM-70 Series
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