Aquametrix AM-TBR Turbidimeter User Manual - Manual (Page 16)

11
4. Operation
This process turbidimeter allows for the measurement of the turbidity of process water on-line.
The turbidity of the process water is usually reported in Nephelometric Turbidity Units (NTU), but
may be reported in Formazin Nephelometric Units (FNU). Readings above 1000 NTU (100 for
models AM-TBR3) are outside the range of this instrument. Readings above 1100 NTU (110 for
models AM-TBR3) will cause the display to flash indicating an over range condition.
During normal operation, the instrument will have the arrow beside AUTO highlighted with the
current scale displayed on the lower row of the display and the measured reading on the upper
row of the display (see illustration below).
4.1. Routine Measurement
The following steps describe how to measure the turbidity of a sample using this
instrument:
1. Apply power to the instrument and allow the unit to warm up (typically 45 minutes
to 1 hour on initial commissioning).
2. When a continuous process stream is flowing through the instrument, the
instrument will display the measured turbidity level of the sample by displaying it
on the LCD screen. In addition, the equivalent signal is provided on the analog
(4-20 mA) output, or the digital output, depending on the options selected.
4.2. Security Access Feature
The instrument is equipped with a security access code feature that can be activated in
the configuration mode. If the security feature is enabled, the screen shown in the
illustration below will appear when the MODE/EXIT button is pressed.