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value.

Table 3. List of control parameters and the initial settings under code 155

Symbol

Display

OAL

COOL

OUT

Out

C-F

Details about each parameter.

 SC, calibration offset. The parameter is used to make the input offset to

compensate for the error produced by sensor. Each unit is 0.1 degree. e.g. if the

temperature displays 2.0 ° C in ice water mixture, set SC=-2.0 will make the

display to shown 0.0 degree.

 AL, Alarm temperature in degree. When the temperature passes the alarm set

value, the alarm LED and buzzer will be turned on. When the temperature drops

to that value, the LED and buzzer will be turned off. The alarm is for high limit

alarm only. It will not shut off the out.

 FA. Alarm buzzer control. When FA=1, the buzzer will be on when the alarm

LED is lit. When the FA=0, the buzzer will not be turned on at the alarm

temperature.

 oAL. Open loop alarm. This parameter is for detecting an open loop in the control

system. e.g. if the sensor was forgotten to be inserted in the oven, or the sensor is

defective, or the heater is defective. When enabled (oAL=1), it will shut off the

output if the temperature increased less than 3 ° C (5 ° F) after the controller was

powered up for 5 minutes. The alarm buzzer will be turned on at the same time.

The display will flashing OPEN (oPEn).

 Hy. Hysteresis band (or dead band). This parameter is used for on/off control only.

In the on/off heating mode, the heater will be turned off when T = SV, and turned

Description

Off set (degree)

Alarm Setting

Alarm buzzer

Open loop alarm

Hysteresis band

Control mode (heating or cooling)

Output power percentage (%)

Temperature unit

Timer

Range

Initial

-20~+20

-58-752° F

-50-400° C

250

0=off 1=on

0-100

0=heat 1=cool

1-100

100

° C or ° F

° F

1=on, 0=off