23
Sat Disabled
Atr 3.60
AL1 720
Pb 1.0%
ti 180
td 30 sec
cbl 20
cbh 20
Hc 0.3
sbr 0
Remove the controller from its sleeve and remove the link set above.
6 Set the 2nd link on the controller to access 'Configuration Mode'. Replace the controller in its sleeve.
7 Change C1 = 0002 to 4002 (CAL Trim in Eng units)
Adjust the tr value to -1°C offset
Scroll to Clr and press the UP,
, or DOWN,
▼
, arrow keys together to fix the configuration values
Remove the controller from its sleeve and remove the link. Replace the controller in its sleeve.
8 Set the required operating temperature on the temperature controller by depressing
the respective UP,
, or DOWN,
▼
, arrow key until the desired value is obtained.
9 As the fluidised bath heats up, the fluidising air flow rate is automatically reduced so as to maintain a constant
level of fluidisation irrespective of the bath temperature.
10 When the fluidised bath reaches the set temperature, the temperature controller will show 'E' in the program
status window and the process variable and set point will indicate the same value.
Calibration
1 When using the FB-08C to calibrate thermal sensors such as thermocouples and platinum resistance
thermometers, it is important to ensure that the working volume of the fluidised bath is thermally stable.
Use an independent temperature sensor, such as a reference thermocouple, to check the temperature
uniformity and stability. The temperature uniformity should be within approximately ±0.2°C at any
temperature. Adjustment of the fluidising airflow rate may be required to improve the temperature
stability. Adjustment details are contained within the following section which details the automatic
fluidising air control system.
2 The temperature stability of the fluidised bath at any operating temperature may be improved by
tuning the control parameters of the 818P temperature controller to match the performance of the
system under any set conditions. Adjustment details are contained within the manufacturer's instruction
manual for the Eurotherm 818P temperature controller.
3 For precise calibration the actual temperature of the fluidised bath should be measured with an
independent calibrated reference sensor; the temperature indicated by the temperature controller
should only be used as a guide and not as an indication of absolute temperature.
4 The number of sensors calibrated in the fluidised bath at any one time should be kept to a minimum so
as not to disturb the flow pattern within the bath. Typically up to 10 sensors of approximately 10mm
diameter may be calibrated without loss of performance.
5 Techne are able to offer a work basket which ensures that the probes being calibrated are held within
the working volume of the bath, alternatively custom built probe holders are available. Probe holders
locate the sensors being calibrated at a known position within the bath and act as equalising blocks
so that the basic isothermal properties of the fluidised bath are further enhanced.
