TSI Instruments SUREFLOW 8635-M, Operation And Service Manual

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User Basics 5

/

Keys
The

/

keys are used to scroll through the menus, menu items, and through
the range of item values that can be selected. Depending on the item type the
values may be numerical, specific properties (on / off), or a bar graph.
Alarms
SureFlow monitor has visual (red light) and audible alarms to inform the user of changing
conditions. The alarm levels (set points) are determined by administrative personnel,
Industrial Hygienists, or the facilities group depending on the organization.
The alarms, audible and visual, will activate whenever the preset alarm level is reached.
Depending on the SureFlow monitor items installed, programmed alarms will activate
when room pressure is low or inadequate, when room pressure is high or too great, or
when the supply or exhaust air flow is insufficient. When the laboratory is operating
safely, no alarms will sound.
Example: The low alarm is preset to activate when the room pressure reaches -0.001
inches H
2
O. When the room pressure drops below -0.001 inches H
2
O (gets
closer to zero), the audible and visual alarms activate. The alarms turn off
(when set to unlatched) when the unit returns to the safe range which is
defined as negative pressure greater than -0.001 inches H
2
O.
Visual Alarm Operation
The red light on the front of the unit indicates an alarm condition. The red light is on for all
low and high alarm conditions.
Audible Alarms
The audible alarm is continuously on in all low and high alarm conditions. The audible
alarm can be temporarily silenced by pressing the
MUTE key. The alarm will be silent for
a period of time (see MUTE TIMEOUT to program time period). When the time out period
ends, the audible alarm turns back on if the alarm condition is still present.
The user can program the audible alarm to be permanently turned off (see
AUDIBLE
ALM ). The red alarm light will still turn on in alarm conditions when audible alarm is
turned off.
The audible and visual alarms can be programmed to either automatically turn off when
the unit returns to the safe range or to stay in alarm until the
RESET key is pressed (See
ALARM RESET ).