Hanna Instruments HI520 - Controller Basics; Front Panel

11 Controller Basics
3. CONTROLLER BASICS
3.1. FRONT PANEL
• The front panel includes a graphic display and keypad with tactile feedback
• Two LEDs, ALARM and STATUS, indicate alarm and status conditions
• HOLD LED lights up yellow indicating controller HOLD status
• Depending on the model, up to five additional LEDs light up blue, indicating relay status
?
DIAG
HOLD
STATUS
ALARM
REL 1
REL 2
REL 3
REL 4
REL 5
°C
25. 0
mV
401
Ф
°C
25.0
pH
6.43
УБ
pH & ORP
8
1
2
7
5
6
4
3
Figure 1: Front Panel & Keypad Description
Front Panel & Keypad
1 Alarm & Control relay LEDs
2 Graphic Display (LCD)
3 Keypad
4 Cable glands
5 Hold LED
6 USB‑C Port
7 Status LED
8 Captive spring loaded screws