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MLA 900 Operating Instructions V 2.0 8011381 © MBA Instruments GmbH
Notes on application
2.1
Approved use
2.1.1
Designated use
Measuring function
The MLA 900 determines the electrical conductivity and the temperature of petroleum
products such as occur, for example, in aviation fuels and in other petroleum products.
During the filling process, pumping or filtering, these liquids may become electrostatically
charged. If, in addition, there is an inflammable gas mixture present in the ambient
atmosphere, there is a danger that the gas mixture will be ignited by a discharge spark,
which means that it may explode. To evaluate this risk, the electrical conductivity of the
liquid is measured (see German standard DIN 51 412-T02-79, »Determining electrical
conductivity, field procedure«).
The conductivity is stated in the physical unit »pS/m« (picosiemens per meter). This unit
corresponds to »c.u.« (conductivity unit), which is still commonly used in the petroleum
industry:
Ambient conditions
The MLA 900 is designed as a measuring instrument for outside use.
b
Use the MLA 900 at an ambient temperature of –20 °C … +60 °C (–4 … +140 °F).
Outside this temperature range it can no longer be guaranteed that the instrument will
function correctly.
2.1.2
Application restrictions
The MLA 900 may only be used to measure the conductivity and temperature of petroleum
products, such as petrol, kerosene and oils/greases. Other liquids such as acids or
solvents containing chlorinated hydrocarbons, for example, can damage the measuring
probe.
●
At temperatures above +60 °C (140 °F) there is a danger that caustic liquid
from the battery may escape and damage the electronics. Apart from this,
the LC displays may be damaged (irreversible blackening).
●
At temperatures of below –20 °C (–4 °F), the LC displays in the display unit
may freeze, resulting in the LC display enclosure bursting.
●
Low temperatures affect the flexibility of the probe cable.
b
Avoid bending the probe cables in low temperatures.
Otherwise the probe cable could brake due to the sheath becoming brittle.
component
clean with
avoid contact with
measuring probe
probe cables
petrol
spirit (ethanol)
isopropanol
acids
chlorinated hydrocarbons (CHC)
methanol
acetone
1
pS
m
1 c.u.
=
Summary of Contents for MLA 900
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Page 14: ...14 MLA 900 Operating Instructions V2 0 8011381 MBA Instruments GmbH Preparing for operation ...
Page 34: ...34 MLA 900 Operating Instructions V2 0 8011381 MBA Instruments GmbH Storage transport ...
