Document Reference: X-0036-01-07 Cadmus & Ratifi Operating Manual
Drawn: 13/11/2020
Page 13 of 66
1.9.2
Channel 1 (Internal Temperature).
The Channel 1 tab contains parameters related to
the internal temperature channel only.
On the CTX-203 and CTX-213 this sensor is
mounted under the lower vents as shown to the
right. This channel is ideally suited to monitoring
ambient office and warehouse temperatures,
which are slow changing. The CTX-303 also has
an internal temperature sensor but this is sealed
within the enclosure and has a slower response
time.
Parameter Name
Description
Options
TYPE
Internal Temperature
Read only.
CHANNEL NAME
Channel descriptor text.
16 Characters maximum.
ENABLE
Enable or Disable the channel.
ON or OFF
Sensor Alarms
The internal channel has 4 associated sensor alarms. 2 high alarms and 2 low alarms. The high high and low low alarm are given a higher priority in ratifi when
active, otherwise high high is handled the same as high, and low low is handled the same a low. Each of the 4 sensor alarms can be individually enabled or disabled,
with its own Setpoint. The channel has a hysteresis and alarm delay value which is common to all 4 sensor alarms.
Parameter Name
Description
Options
X ALARM ENABLE
Sensor alarm enabled or disabled.
ON or OFF
SETPOINT
Setpoint Temperature
Decimal value
X = HIGH HIGH, HIGH, LOW or LOW LOW.
High and High High Sensor Alarms.
Alarm active when last read value > Setpoint, alarm clears when last read value < (Setpoint - Hysteresis).
Low and Low Low Sensor Alarms.
Alarm active when last read value < Setpoint, alarm clears when last read value > (Se Hysteresis).
Hysteresis
Where the sensor alarm Setpoint determines when an alarm is raised, the hysteresis determines when an alarm clears. Using hysteresis reduces continuous alarming
when a sensor measurement is very close to the Setpoint value. The hysteresis can be set to 0.2, 0.5 or 1.0°C. For more information on hysteresis refer to the
hysteresis section. Recommended setting is 0.5°C.
Alarm Delay
The channel is sampled every 60 seconds, independent of the store rate. This gives a worse can alarm response < 60 seconds. The alarm delay maybe configured to
delay the alarm from triggering for up to 10 minutes. When an alarm is delayed the measurement must be continuously above/below the Setpoint for the indicated
time before the alarm triggered. If the measurement drops below / above the Setpoint before the indicated time the alarm will not be raised. This function is useful on
fridges or freezers where opening the door may cause a very short spike in air temperature.