Hach ORBISPHERE K-M1100 Basic User Manual page 21

9.1 Portable calibration device
The portable calibration device (part number 33088)
is ideal for calibrating the sensor close to its location
in the sample. The device is designed to hold a one
liter gas cylinder but is fully compatible for use with
other kinds of gas cylinders.
When using other types of gas cylinders, simply
connect the gas supply to the Swagelok connector
(No. 1), and make sure that the inlet gas pressure
does not exceed 2 bars absolute.
The gas bottle is not supplied and must be
purchased locally.
To ensure the calibration works correctly the calibration gas bottles must be of 99.999% (50) quality
or better. Bottles containing 34 liters of compressed gas with a 5/8-18 UNF (C10) fitting are
compatible with the hand-held calibration device and recommended for this purpose. Empty gas
bottles are easily removed from the device. Simply unscrew the small screw (No. 2) a few turns, slide
the bottle out of the holder, and unscrew the bottle from the pressure reducer. Follow this same
procedure in reverse order to install a new bottle.
9.2 Sensor calibration
The sensor can be calibrated manually on an ad hoc basis. By default, the mode is set to zero
calibration with auto-end.
For higher level concentrations (above 1% oxygen which corresponds to about 400 ppb dissolved
O ) a high level adjustment can be performed using a gas mixture containing more than 1% oxygen,
2
or a known line sample. However, this should not be done without first ensuring the zero point is
accurate. This can be achieved by performing a zero calibration first.
Low range sensors: (K1100-L and M1100-L spots)
There are two calibration modes available - zero or high level adjustment. The sensor is factory
calibrated at zero. During use, the zero calibration is the best calibration to guarantee the sensor
specifications. After a spot replacement, a zero calibration is recommended.
High range sensors: (K1100-H and M1100-H spots)
There are three calibration modes available - zero, high level adjustment or in 100% humid air. The
sensor is factory calibrated at zero and in 100% humid air. During use, humid air calibration is the
best calibration to guarantee the sensor specifications. After a spot replacement, a zero calibration
and a 100% humid air calibration are recommended.
9.2.1 Initial sensor calibration
The sensor has been calibrated at the factory prior to shipment and is ready for use upon delivery.
However, if the sensor has not been used for a period of more than six months since delivery or if the
sensor spot has been replaced or changed in any way, then a sensor calibration will be required.
1. From the Main menu, select Calibration followed by Gas sensor and then Configuration. Make
sure the parameters are set as follows:
Option
Auto-calibration
Manual-calibration
Hold during calibration
Description
Not available for this sensor.
Make sure that the Auto-End box is checked.
Make sure this box is checked.
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