Hach-Lange 1720E Low Range Turbidimeter - Manual (Page 8)

4
Specifications
Verification (Wet) Method
1. StablCal ® (stabilized formazin) – recommended for verification in the appropriate
application range of measurement. For regulatory verification, standards of 0.1 to 50
NTU.
2. Formazin – fresh user-prepared standard
Verification (Dry) Method
1. ICE-PIC™ Verification Module with factory-set values of 20.0 or 1.0 ±25%. Unique value
is assigned when dry verification is done immediately after calibration and is used as
pass/fail criteria for subsequent verifications.
Recommended
Maintenance
1. Lamp replacement: once per year.
2. Cleaning: mandatory before calibration, optional before calibration, and mandatory upon
verification failure.
Installation Environment Indoor
Primary Compliance
Method
USEPA 180.1; Hach Method 8195; ASTM D 6698; Standard Methods 2130B
Limit of Detection 1 0.0032 NTU (according to criteria specified by ISO 15839)
1 All specifications are based on a calibration with 20.0 NTU formazin and with the offset turned off.
Table 1 1720E Low Range Specifications (continued)