Hanna Instruments HI 504 - Manual (Page 5)

9 8
REAR PANEL
1. BNC Socket for pH or ORP electrode
2. Connection for Potential Matching Pin
3. Connection for electrode reference
4. Connections for Pt 100/Pt 1000 temperature sensor
5. Not Connected, for future use
6. Digital Transmitter input
7. HOLD input
8. Advanced Cleaning input (optional)
9. Power supply input
10. Alarm terminal
11. Relay 2 - second dosing terminal (optional)
12. Second analog output (optional)
13. Relay 1 - first dosing terminal
14. First analog output
15. HOLD output
16. Relay 4 - for Advanced Cleaning feature (optional)
17. Relay 3 - for Advanced Cleaning feature (optional)
18. RS485 output terminal
Unplug the meter before starting any electrical connections.
Disconnect the Potential Matching Pin when setup item I.04=”OFF”
FUNCTIONAL DESCRIPTION
FRONT PANEL
1. Liquid Crystal Display
2. LCD key
enters and exits the event scrolling mode. During pH
calibration, alternately displays pH buffer value or current
temperature
3. SETUP key enters and exits setup mode
4. CAL DATA key last calibration data viewing (enters and exits)
5. CAL key initiates and exits calibration mode
6. æ key increases the blinking digit/letter by one when selecting a
parameter. Advances forward while in last calibration data
viewing mode or event scrolling mode. Increases the tem-
perature setting when temperature probe is not inserted
7. key decreases the blinking digit/letter by one when selecting a
parameter. Reverts backward while in last calibration data
viewing mode or event scrolling mode. Decreases the
temperature setting when temperature probe is not inserted
8. key moves to the next digit/letter (circular buffer) when select-
ing a parameter. Same as
æ key during last calibration
data viewing mode. Move to the next piece of information
for the current event while in event scrolling mode
9. CFM key confirms current choice (and skips to the next item) ENTER
10. LEDs Relay’s 1, 2, 3, 4 activation
11. LEDs Controller Status, alarm activation