Hach-Lange HQD - Luminescent Dissolved Oxygen Probe LDO - Manual (Page 2)

2 DOC272.53.80021
Preparation for use
1. Verify that the LDO sensor cap and iButton are installed correctly. Avoid touching the
sensor cap with a hand, fingers or any surface that may scratch the cap.
Note: Make sure the LDO sensor cap and iButton have the same lot code and the iButton label
faces upward.
2. Rinse the sensor cap with deionized water and blot dry.
Note: The LDO sensor cap must be pre-conditioned if dissolved oxygen monitoring periods are
longer than 6 hours. Refer to
Maintenance on page 6 .
Figure 1 Probe overview
1 LDO sensor cap 5 Pressure sensor module
2 Rugged probe (5, 10, 15 or 30 meter cable) 6 iButton ® (iButton is a registered trademark of Maxim
Integrated Products, Inc.)
3 Standard probe (1 or 3 meter cable) 7 Pressure sensor module cap
4 Probe cable