Emerson Rosemount 975MR, Справочное руководство

Страница: 40 / 74

• Only access the wiring compartment to wire or remove the detector or access RS-485
terminals for maintenance.
• Disconnect or disable external devices, such as automatic extinguishing systems,
before carrying out any maintenance.
3.2.1 Factory default function settings
Table 3-1 lists the default function configurations supplied with the detector.
Table 3-1: Factory Default Function Settings
Function Value Notes
Sensitivity 30
Alarm delay A Antiflare
Alarm latch No
Auxiliary relay No In output configurations 1A,
2A, and 3A, the auxiliary relay is
not available. This function is
not used.
Automatic built-in test (BIT) Yes
Alarm built-in-test No
Auxiliary built-in test No In output configurations 1A,
2A, and 3A, the auxiliary relay is
not available. This function is
not used.
Heated optics Auto
Heat on 41 °F (5 °C) The detector starts heating the
window for any temperature
below this value.
In order to change the default function, use:
• USB RS-485 harness kit PN 00975-9000-001
• HART ® protocol. Refer to manual 00809-0200-4975 for instructions.
3.3 Testing procedures
This section describes the proof testing procedure for proper operation of the detector.
Test the detector using the manual built-in test (BIT) or the flame simulator.
The detector performs the internal test continuously and the automatic built-in test every
fifteen minutes; for more details, refer to
Built-in test (BIT) .
3.3.1 Automatic built-in test
Check that the indicators show normal conditions.
See Power up .
Operating the detector Reference Manual
August 2019 00809-0100-4975
40 Emerson.com/Rosemount