Calibration; Replacement Of R.h. And Temperature Module (Hd46 - Delta OHM HD45 Series Manual

Instruments are factory-calibrated and normally don't require further interventions by
the user.
The relative humidity and temperature sensors user calibration is not
foreseen.
In HD46... models, relative humidity and temperature sensors, along with stored
calibration data, are included in a module that can be easily replaced by a new one
(HDM46 code). Modules are factory-calibrated and don't require user
calibration. The replaced module can be sent to factory for recalibration.
However, for CO
2
offset correction.
6.1 Replacement of R.H. and temperature module (HD46...only)
To replace the relative humidity and temperature module, open the housing by
pressing down the upper and lower tabs, then pull to remove the front panel (see Fig.
3.A in section "INSTALLATION AND CONNECTION".
Ensure power supply is not connected (PC not connected to mini-USB serial
connector).
The module is located next to the terminal block, under the mini-USB serial connector
(Fig. 6.A). To remove it, gently pull upwards.
Fig. 6.A: R.H. and temperature module position in HD46... models
Put the new module in place of the removed module, paying attention to position it in
the correct direction (module contact pins must be positioned towards the mini-USB
serial connector).
Once the procedure has been completed, reconnect the power supply and relocate the
front panel ensuring to correctly position the upper and lower tabs.

6. CALIBRATION

measuring modules, a new calibration can be performed for sensor
- 37 -
Mini-USB
Connector
R.H. and
temperature
module
Terminal block