GE Hydran 201i, Instruction Manual

Page: 75 / 300

User Interface Operating Modes
Part 17997 Rev. 6, March 2011 4-3
• Third priority : If all active alarms have been acknowledged and if the keypad is not used,
to display a list of messages at a rate of one message every five seconds. This task
corresponds to the Main Display mode (Section 4.2.2 on page 4-4).
4.2 USER INTERFACE OPERATING MODES
The Hydran 201T i ’s user interface uses five operating modes:
• Unacknowledged Alarms mode (Section 4.2.1 on page 4-3): The H201T i displays
flashing messages of unacknowledged alarms. The user acknowledges an alarm by
pressing the
ENTER key while the corresponding alarm message is displayed on the
display.
• Main Display mode (Section 4.2.2 on page 4-4): In this basic, unattended operating
mode (if all active alarms have been acknowledged and if the keypad is not used), the
H201T
i displays a list of four messages:
– Gas level (in ppm)
– Hourly trend (in ppm/x hours)
– Daily trend (in ppm/x days)
– Date and time
• Menu Navigation mode (Section 4.2.3 on page 4-5): This mode gives access to the
H201T i ’s parameters and commands.
• Parameter Modification mode (Section 4.2.4 on page 4-6): This mode is used with the
Menu Navigation mode to set the H201T i ’s parameters (alarm levels, date and time,
etc.).
• Power-up mode (Section 4.2.5 on page 4-6): This mode is used only during the H201T i ’s
power-up. Three sequences can occur:
– Normal power-up: Occurs if the ac power supply has been off for more than five
minutes.
– Short power-up: Occurs if the ac power supply has been off for less than five minutes.
– First power-up: Occurs if the H201T
i ’s battery has been disconnected and recon-
nected.
4.2.1 Unacknowledged Alarms Mode
An alarm condition exists when a variable (such as gas level, gas trend or sensor temper-
ature) has exceeded the predetermined limits (“alarm setting”). Alarms are explained in
detail in Chapter 10; all alarm messages are given in Section 12.1 on page 12-1.