HF scientific MicroTPW Field Portable Turbidimeters - Manual (Page 11)

MicroTPI & MicroTPW (5/10)
Rev. 1.9
5
3.0 Normal Operation
This instrument allows for the measurement of the turbidity of a grab sample. The
turbidity is reported in Nephelometric Turbidity Units (NTU) and Formazin
Nephelometric Units (FNU). Readings above 1100 NTU are outside the range of this
instrument.
Note: Nephelometric turbidity units (NTU’s) are numerically equivalent to Formazin
nephelometric units (FNU’s) (See Glossary).
Below are some typical screens and a description of when you should see them.
When turning on the instrument or after a calibration, this screen indicates that the
instrument is ready to read:
The instrument will display moving dashes on the screen for 6-7 seconds prior to
displaying a value. This will occur prior to taking a reading & prior to indexing. No
keypad presses will operate during this time.
After taking a reading, a typical display:
If the sample that is being measured has a turbidity that is higher than that which the
instrument can measure, the instrument will indicate this as an over-range condition by
flashing 1100: