Scott QuadScan II 7400, Руководство по эксплуатации и техническому обслуживанию, Страница: 13 / 121

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Receiver/Controller
General
The QuadScan II Receiver/Controller is a 4 channel gas receiver designed to operate with any 2, 3, or 4 wire gas
transmitter. The unit has 3 major components:
NEMA-4X wall mounted enclosure
Display/function assembly
CPU/power supply boards
All setup functions are completely programmable using the switches located on the display/function assembly. An
internal alarm horn is mounted within the enclosure providing 85 db at 1 ft.
Four 5A SPDT relays are included which are common to all 4 channels. Relays provide the following:
FAIL Activates on a failure of the current loop signal from the field device or an internal failure such as
power loss.
WARN Activates on a programmed set point corresponding to an increasing or decreasing gas
concentration, flame signal or any other analog signal.
ALARM Activates on a programmed set point corresponding to an increasing or decreasing gas
concentration, flame signal or any other analog signal.
Note: Alarm set points are typically programmed for a higher gas concentration than the warn
setpoint when monitoring an increasing gas concentration, including toxic and combustible gases. For
a decreasing gas concentration application such as oxygen, the alarm set point is set lower (e.g. 16%
v/v) than the warn set point (e.g. 19.5% v/v). Although, the alarm set point can be programmed to
detect rising oxygen concentration and the warn setpoint programmed to detect decreasing oxygen
concentration.
HORN Programmed to activate on for warn, alarm or both.
An optional remote relay assembly in a NEMA-4X wall mount enclosure can be provided when individual alarm
outputs are required. There are six 5A SPDT and two 5A DPDT relays. These relays can be assigned or zoned to
any input channel.
The Quadscan II receiver controller will not operate with out a source of electricity. If you require an electricity source
for short term outages either provide another source of electricity such as a battery backup. An optional battery
backup assembly is also available providing 2.5 amp-hours of DC power to the unit. Factory supplied battery (Scott
Health & Safety P/N 004-0002) is a Sonnenschein Part No. A212/35, 12 volt 2.5 amp hour battery.
Warning: Replace the battery only with the same type and rating.