Hach DR300 Service Manual

Step Description Picture
3 Remove the plastic insert for dongle or the Hach
Communication Dongle.
4 To remove the screws (4x), use a TORX T10 torque screw
driver.
5 Open the instrument.
1. Top housing including keypad
2. Display
3. Mainboard including optical unit
4. Seal
5. Bottom housing
6 To reassemble the instrument, follow the previous steps in
reverse order.
Note: Coat the seal groove with Krytox oil.
Note: Make sure that the seal is in the correct orientation.
Note: Make sure that the screws are tightened to 0.8 Nm.
Repairs
36

Hach DR300 Specifications

General

Type	Portable Spectrophotometer
Operating Temperature	0 to 50 °C
Method	Pre-programmed methods
Light Source	LED
Wavelength Accuracy	±2 nm
Resolution	0.001 Abs
Display	LCD
Measurement Method	Absorbance
Parameter	Various
Photometric Range	0 to 2.5 A
Dimensions	230 x 93 x 280 mm (9.1 x 3.7 x 11.0 in)
Photometric Accuracy	±0.005 Abs