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MESALabs |
MESALabs |
IBP |
IBP |
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NEO2 |
90XL |
HDM97Pocket |
HDM99XP |
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| Measuring |
Number of measuring
channels |
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4 |
4 |
4 |
9 |
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Conductivity |
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Temperature |
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Pressure |
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pH |
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Flow |
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Voltage |
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Frequency/Pulses/Events |
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| Features |
Graphic on screen |
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Oscilloscope
Function |
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Temperature
Compensation
selectable by brand name |
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Automated Pressure Drop Measurement |
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Computer Interface |
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Data Acquisition Software |
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Warranty |
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12 month |
12 month |
24 month |
24 month |
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| Measuring |
Conductivity
accuracy (2
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20 mS/cm) |
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±0.1 mS/cm * |
±0.1 % ** |
±0.03
mS/cm |
±0.03
mS/cm |
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Temperature
accuracy
(25 ... 40°C) |
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±0.2 °C * |
±0.1 °C *** |
±0.05 °C |
±0.05 °C |
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Temperature
accuracy
(41 ... 90°C) |
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±1 °C |
±0.1 °C |
±0.1 °C |
±0.07 °C |
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Pressure
Range
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-700 to +1000 mmHg |
-600 to +1600 mmHg |
-700 to
+1900 mmHg |
-700 to
+1900 mmHg |
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Pressure Accuracy
( 0 ... 300 mmHg) |
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±5 mmHg |
±1.0 mmHg |
± 1 mmHg
± 0.05 mmHg as Option |
± 0.5 mmHg |
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Pressure
Accuracy
otherwise |
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±1% of reading |
±0.5% of reading
+ 1 mmHg |
± 2 mmHg |
± 1 mmHg |
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pH Accuracy
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± 0.1 pH units |
± 0.1 pH units |
±0.02 pH units |
± 0.02 pH units |
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* |
In
accordance to ISO 10012-1 the accuracy is to low to calibrate
any dialysis machine.
Read more. |
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** |
The
specified conductivity accuracy by Mesalabs of ±0.10% leads to
0.015 mS/cm at 15 mS/cm.
This seems to be a misprint for following reason.
The reference material with the highes accuracy Mesalab is using
comes from
Dansk Fundamental Metrologi A/S.
This material is specified to have a measuring uncertainty of
0.15%. It can be estimated that the calibration procedure
at Mesalabs adds another 0.05% uncertainty which leads to an
uncertainty of ±0.20%. This uncertainty can roughly estimated to
an measuring accuracy of about 0.1%. According to ISO 10012-1
the reference to calibrate a device needs to be at least three
times higher than the device to calibrate. Following this rule
the calibrated meter has a accuracy of 0.3% which leads to an
accuracy of 0.045 mS/cm at 15 mS/cm. The published accuracy by
Mesalabs is
incorrect and should be about 0.3%. |
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*** |
Due
to the temperature compensation the accuracy of 0.1 °C at 37°C
leads to a possible error of the conductivity measurement of
about 2.4% which computes to 0.36 mS/cm at 15 ms/cm. |