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    Pro-therm Controls

''Controls to make life easier'                                                                          Established 1990

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General Description


HP56, HP56a is a 3 set point, PID or on/off temperature control designed specifically for automatic selection of different set points.

It has 2 relay outputs and either a solid state drive or proportional 0-10Volt output through H1SO option.


Main Features

For the user, separate temperatures may easily be set and then selected by a separate switch.

(Set values can be secured from unauthorised tampering by closing a pair of contacts on the rear terminals enabling 'key lock' security)

Alternatively, an external timer could initiate the different  temperature set points automatically.

20mm display indicates temperature in C or F.

LEDs indicate condition of programme, and output relay.

PID Temperature Control  - 3 Setpoint  HP56, HP56a

2 relay and solid state relay output   

Technical Specification


Power supply                                                     230V +/- 10%

Mains frequency                                                50Hz +/- 20%

Power consumption                                           4W

2x SPST Output Relays:

Resistive contact rating                                     3 Amp 220V - AC1

Inductive contact rating                                    1 Amp 220V - AC3

1x Solid state Relay output                                5Volts DC

Operating temperature                                      -10/70 Deg.C

Overall dimension                                             96 x 96 x 63 mm

Overall dimension (IP54 version)                     98 x 125 x 75 mm

Additional Features:


Programmable  on/off or PID control,  Relay/Solid State Relay/ 0/10V / 4-20mA outputs.

Tamperproof locking by linking contacts at rear allows 'key lock' security of settings.

Temperature limits  Maximum and minimum temperature range can be set.

Self tune for optimal setting of PID parameters selectable for continuous operation.

Removable terminal strips for easy connection/disconnection

Adjustable 'ramp rate' to each new set point ensures smooth transition between levels.

2x auxillary relays can be used for high and/or low temperature alarms which can be set individually to either 'track' the set point or to have an absolute setting.

Sensor input programmable for thermocouples  J,K,R,S.T,N -250/+1700 Deg.C or F,  Pt100 -200/+550 Deg.C or F

Programmable for 1,2 or 3 set points.

Rear view showing removable terminal strips

UK Mail Address:  Pro-Therm Controls  21 Main Road,   Ratcliffe Culey,

Atherstone,  Warwickshire. UK.   CV9 3NY

We take:

E-Mail: vince@pro-therm.co.uk

Phone:  (0044) 01827 711039

Fax: (0044) 01827 711041