http:// /> Model BWY-804 Transformer thermoregulator is a new generation product derived from Model BWY-802/803 one in compliance with JB/T6302-92 Standard of pressare-type thermoregulatro for transformer issued by the national machinery ministry.It is suiable for taking measurement and control of oil temperature in a medium-sized or large-sized transformer.

The BWY-804 features following new points:

1.Wide scope of application

To meet the need of intelligentized control in an unattended transformer house,the BWS-804 can ouput following controlling signals

a)Pt100 platinum resistance signal

b)4-20mA direct current signal

c)RS232/RS485 communication interface.

2.Four sets of switch,which can be set within a whole span,are employed to respectively control over the transformer coolong system,overheating alarming and tripping,etc.

3.To Satisfy different enquirements of customers,two selections of mouting dimension of the BWY-804 are offered when installation.

a)Mountig dimensionI:It is the same mounting dimension as that of BWY-802/803,which is specificed by JB/T6302-92 standard.It is our recommendation that you adopt this one.

b)Mounting dimension II:It is the same mounting dimension as that of some imported meters.It is convenient for same customers who originally installed imported meters to replace with ours now.


3 Of XMT-288F/288FC digital display thermometer

3.1 normal operating conditions:(-10-50)℃

3.2 measuring range:(0-100)℃ (0-120)℃ (0-150)℃

3.3 measurement accuraey:grade 1.5

3.4 resolution ratio:0.1℃

3.5 input signal:Pt100 platinum resistance signal, three-wire system(the signal comes from BWY-804)

3.6 power supply:AC220V±10%

3.7 control function:

a setting range: adjustable within the whok span

b setting accuracy:±1℃

c switch difference:2℃

d contact capacity:AC 220V/3A

e standard set point:55℃,80℃

3.8 Output (confined to XMT-288FC):

a constant voltage signal:(0-5)V.(1-5)V;

b direct current signal:(4-20)mA;

c communication interface:RS232.RS485.

4.Control point setting

4.1 Of BWY-804 Thermoregulator:

The temperature control points of each BWS-804 have been already set in accordance with JB/T6302-92 standard before its delivery.(refer to:3. main techuical parameters) If users need to change the value of set points,please follow below procedures:

4.1.1 take off the meter cover with a supplied 10mm solid wrench;

4.1.2 Unscrew switch fixed bolts with a supplied 6mm solid wrench (refer to figure 4 );

4.1.3 stir the red setting needles to set value planned;

4.1.4 screw back switch fixed bolts;

4.1.5 close the cover.

4.2 Of XMT-288F/288FC digital display thermometer:

4.2.1 shift the toggle switch to [set" position(Figure 3 );

4.2.2 Adjust the regulating potentiometer until the temperature value planned;

4.2.3 shift the toggle switch back to [measurement" position.