998-2821
Rev. D
Page 4
1. Introduction
1.1
Description
Turner Designs’ Little Dipper
2 is an accurate, single-channel fluorometer designed
to measure the concentration of your fluorophore of interest. The Little Dipper
2
provides a 4 - 20 mA output signal proportional to the concentration of the
fluorophore in the sample or source water. In a representative application, Little
Dipper
2 can be used with a data collection system to monitor and control the level
of treatment chemicals in industrial applications.
The sample water’s fluorescence
intensity is measured by passing the sample water, containing the fluorophore of
interest, past the Little Dipper’s optical window. An excitation light source illuminates
the solution and excites the fluorophore in the solution which fluoresces at a different
wavelength. The intensity of the emitted light is proportional to the concentration of
the fluorophore in the sample or source water.
Turner Designs’ Little Dipper
2 has
a low maintenance design that will provide trouble-free performance.
1.2 Inspection and Setup
Part Number
Dynamic Range
Factory Adjusted
2820-000-A
< 1 to 300 ppb typical for PTSA
< 1-200ppb (18.0mA
– 19.5mA)
2820-000-F
< 1 to 100ppb typical for Fluorescein < 1-100ppb (18.0mA
– 19.5mA)
If your application requires a different concentration range, the Calibration
Cable kit P/N 2820-505 is required. Contact
Refer to calibration procedure in Section 3. Refer to Appendix E if integrating
with a Control Box.
Little Dipper
2 Fluorometer
with label specifying serial
number of unit
4-20mA cable P/N 021-2800
5-foot long cable with 4 bare
leads: Black, Red, Orange
and Brown
1 in. (NPT) mounting tee
for
flow through measurements.
Threaded Connection Ring
Calibration Cable Kit P/N 2820-505
12v Power Supply
Calibration Cable
