Thermo Fisher Scientific CryoExtra CE8100 Series
Operation | 19
Remote Alarm Monitoring
The Controller is equipped with a global remote alarm relay
and four specific discrete dry contacts that allow remote
monitoring of alarm conditions. Once activated, these latching
contacts will retain their alarm state until the alarm condition is
corrected and cleared. Although CryoExtra does not provide
remote monitoring or programmable logic Controller (PLC)
systems, these devices can be easily connected to the
Controller. For example, it is possible to setup a Controller so
that if a Low Level Alarm is triggered, the remote monitoring
system will automatically send an email or place a call to alert
the necessary individuals of the freezer’s status. For proper
discrete contact function, ensure the negative (low voltage)
terminal of the remote monitoring system is connected to the
COMMON discrete contact terminal and the positive (high
voltage) terminal is connected to the respective discrete alarm
terminal. Wires can be inserted and removed from the
terminals by placing a small flathead screwdriver into the slot
above the contact and prying down the latch until the clamp
connector opens. Remove the flathead screwdriver to close
the clamp connector. For alarm contact test procedures, refer
to the
section. Below are the remote
alarm contact specifications and a typical remote monitoring
setup schematic.
If an alarm condition has been corrected, but it continues to
register through the global or discrete contacts, remove the
contacts and cycle the power on the Controller. This will clear
the alarm if it has latched in the system.
Figure 6. Controller remote alarm contacts
Figure 7. Typical remote alarm monitoring setup
schematic. Temp A High monitoring
shown
Passwords / Security
The Controller has a multilevel security system that can be
customized to meet your security needs. Four different levels
of security can be assigned up to 10 passwords allowing
users to control who has the ability to change specific settings
as well as to what extent these settings may be altered.
For example, in a tissue bank or repository that employs many
technicians, the facility manager may want to restrict the
technicians’ access to allow them to view alarm settings, but
not have the ability to adjust the settings. In this situation, the
technicians would be assigned a password with low level
security privileges. Conversely, if the shift manager wants to
have complete access to all menus and settings, then
he / she would be assigned a password with high level
security privileges. Password entry mode can be disabled in
the Password Menu. For more information on passwords and
security, refer to the Passwords / Security Setup section.
Password entry mode can be disabled in the Password
Menu. For more information on passwords and security, refer
to the Passwords / Security Setup section.
CAUTION :
If any alarms occur, contact your
authorized CryoExtra Distributor or Technical
Service.
DISCRETE
CONTACTS
GLOBAL
REMOTE
Table 2. Controller Remote Alarm Contact
Specifications
Discrete Contacts
Global Remote
Normally Open
Normally Open or Normally
Closed
Open Collector
Dry Contact Relay
Latching
Latching
Polarity Sensitive
Non-Polarity Sensitive
24 VDC at 100 mA max
230 VAC at 1 A max
