Hach 2100P User Manual

44
SECTION 3, continued
3.6.3 Calibrating the Turbidimeter
Note: For best accuracy use the same sample cell or four matched sample
cells for all measurements during calibration. Always insert the cell so
the orientation mark placed on the cell during the matching procedure
is correctly aligned. (See Section 2.3.4 on page 26 for matching
sample cells).
1. Rinse a clean sample
cell with dilution water
several times. Then fill
the cell to the line (about
15 mL) with dilution
water or use StablCal
<0.1 NTU standard.
Note: The same dilution
water used for preparing
the standards must be
used in this step.
2. Insert the sample cell
in the cell compartment
by aligning the
orientation mark on
the cell with the mark
on the front of the cell
compartment. Close the
lid. Press
I/O.
Note: Choose signal
average mode option
(on or off) before pressing
CAL – the SIGNAL
AVERAGE
key is not
functional in calibration
mode.
3. Press: CAL
The CAL and S0 icons
will be displayed (the 0
will flash). The 4-digit
display will show the
value of the S0 standard
for the previous
calibration. If the blank
value was forced to 0.0,
the display will be blank
(as shown). Press → to
get a numerical display.
NTU
CAL
Hach Company only recommends the use of StablCal
®
Stabilized Formazin or formazin standards for the
calibration of Hach turbidimeters. Hach Company
cannot guarantee the performance of the turbidimeter
if calibrated with co-polymer styrene divinylbenzene
beads or other suspensions. DO NOT calibrate with
Gelex® Secondary Standards.

Hach 2100P Specifications

General

Range	0 to 1000 NTU
Light Source	Tungsten filament lamp
Detector	Silicon photodiode
Operating Temperature	0 to 50 °C (32 to 122 °F)
Power	4 AA alkaline batteries
Resolution	0.01 NTU
Measurement Principle	Nephelometric
Display	LCD