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7.3.2
Selecting an Input Alarm Source
Once an input is selected, a data
source from that input is set. The
following selections are available:
To select an input alarm data
source, press the Alarm Setup key.
The ALARM SETTINGS screen
appears with the input letter in the top left hand corner. Use the s or t key to select an input. Press the
Enter or Next Setting key to show the alarm parameters for that input. Press the Next Setting key until the
source field is highlighted. Use the s or t key to select a source from that input. Use the Next Setting key to
make more changes or press the Save Screen key to store the changes. The default setting is Temp K.
7.3.3
Input Alarm High and Low Settings
High alarm and low alarm setting values for an input alarm are set with a 6-digit value and an additional scale
factor. The scale factor can be selected as n, u, m, k, M, and G. Blank indicates a scale factory of x1. If the
source is changed, the settings return to their default values. The instrument does not restrict the range or
resolution of the alarm setting.
To select an input alarm high or low setting, press the Alarm Setup key. The ALARM SETTINGS screen
appears with the input letter in the top left hand corner. Use the s or t key to select an input. Press the
Enter or Next Setting key to show the alarm parameters for that input. Press the Next Setting key until the
High or Low setting field is highlighted. Use the number keys to enter a value for the setting and press the
Enter key. Press the Enter key. Use the s or t key to select a scale factor: n, µ, m, k, M, and G. Blank
indicates a scale factory of x1. Press the Next Setting key to make more changes, or press the Save Screen
key to store the changes. The default values are Low = 0.0 and High = 1000.
7.3.4
Input Alarm Latching
To enable an alarm latching, press the Alarm Setup key. The ALARM SETTINGS screen appears with the
input letter in the top left hand corner. Use the s or t key to select an input. Press the Enter or Next Setting
key to show the alarm parameters for that input. Press the Next Setting key until the enable field is
highlighted. Use the s or t key to turn alarm latching on or off for that input. Use the Next Setting key to
make more changes or press the Save Screen key to store the changes. The default setting is Off.
7.3.5
Input Alarm Relay Setup
The two relays on the Model 340 can be used for high and low alarm outputs. One or more sets of high and
low input alarms can be directed to the high and low relays. To direct the alarms from an input to the relays,
set the relay parameter on the ALARM SETTINGS screen to On. Parameters on the RELAY & BEEPER
SETUP screen must also be changed, as described in Paragraph 7.4.
When the alarms directed to a relay are not active (status Off), the relay is in the normal position. If any one of
the alarms directed to a relay is active (status On), the relay switches to the opposite position. Relay
connections are shown in Figure 3-7.
To direct an alarm pair to the relays, press the Alarm Setup key. The ALARM SETTINGS screen appears
with the input letter in the top left hand corner. Use the s or t key to select an input. Press the Enter or Next
Setting key to show the alarm parameters for that input. Press the Next Setting key until the enable relay is
highlighted. Use the s or t key to turn the relay parameter on or off for that input. Use the Next Setting key
to make more changes or press the Save Screen key to store the changes. The default setting is Off.
Analog, Digital, Alarm & Relay Operation
Lake Shore Model 340 Temperature Controller User's Manual
TEMP K
TEMP C
SENSOR
LINEAR
Temperature in Kelvin.
Temperature in Celsius.
Raw sensor units as read from the input sensor.
Linear equation output, refer to Paragraph 5.3.3.
7-5
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Troubleshooting
