Intertec Data Systems CP VARITHERM ... BI Series, CP VARITHERM DPA ... BI Series Quick Start Manual

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CP VARITHERM … BI Electric heater

1 Application

Heating of instrument enclosures in hazardous areas,
designed for

 freeze protection
 condensation protection
 temperature maintenance
 preferably horizontal installation.

2 Special Features and Advantages

 Horizontal design allows for optimum installation of the

heater underneath the instruments in the enclosure

 High heat transfer capabilities due to large surface area

of black anodized aluminium fins

 Heater fins can be removed and modified by INTERTEC,

if necessary for installation purposes

3 Description

VARITHERM heaters are finned heaters, heating the air in the
enclosure by convection.

A non-resettable temperature limiter built to ATEX design
specifications is integrated in the core block, cutting off the
power in case of a technical failure or excessive heating
resulting from an external heat source. For this reason and for
reasons of operational safety the heater must only be
operated under conditions that ensure that the trip
temperature of the limiter will not be exceeded:
 The ambient temperature in the enclosure must not

exceed the maximum permissible values.

 An additional external TAE or TS thermostat or must be

connected in series and installed on the surface of the
heater to enhance thermal coupling (see 7). Alternatively,
a TC temperature controller can be used.

 Ensure effective convection by observing the necessary

clearances as per section 7 on the next page. Take care

not to cover the fins.
A residual-current-operated protective device with a rated
value of not more than 300 mA, preferably 30 mA should be
installed.

A temperature indicator shows potential problems and failures
at an early stage (e.g. incorrect installation). Please check the
application if more than 3 fields have irreversibly changed to
black.

Warranty null and void if Heater strip has been removed from
Heater.

All INTERTEC explosion-proof heaters can also be supplied

 in a less expensive, non-explosion-proof design

 to American NEC standard (CSA/ NRTL).

 to ATEX/ IEC standards

Other types upon request.

Don’t remove the adapter!

Remove just the red

cap for conduit installation

For any specific applications requiring high temperature
maintenance we will be pleased to select the suitable
combination of heater and controller.

4 Technical data

EC-Type-Examination
Certificate

IEC Scheme Certificate IECEx PTB 07.0052 X

Marking

CSA Certificate 1655545 (LR43674)
CSA Type of Protection Cl. 1, Div. 1, Gp ABCD T3/T4
Ingress Protection IP 68
Nominal voltage 230V AC
Connection cable EWKF 3x 1,5mm² 8,1mm Ø
Connection cable for

heaters with alarm ...AM
Conduit connection ½“ NPT
Length of connect. cable 39”/ 1 m
Length, width 8.7”/ 220 mm, 8.4”/ 213 mm
Material seawater-proof aluminium, black anodized

5 Types

5.1 for freeze protection

CP VARITHERM
DPA … BI

Nom. Power 200 W 300 W 400 W 500 W
Temp. class T3 T3 T3 T3
Height

5.2 for temperature maintenance to 40° C

CP VARITHERM
DPA … BI

Nominal power 200 W 300 W 125 W
Temperature class T3 T3 T4

Height 3.9”/100mm 3.9”/100mm 3.9”/100mm
Temperature control must be provided by an additional TAE
thermostat or TC temperature controller.

rotection

PTB 02 ATEX 1041X

II 2 G Ex d IIC T4, T3, T6
II 2 D Ex td A21 IP65 T135°C,

T200°C

EWKF 5x 1,0mm² 8,8mm Ø

200 T3 40 300 T3 80

1.6”/40mm 3.1”/80mm 3.9”/100mm 3.9”/100mm

200 T3 100 300 T3 100 125 T4 100

400 T3

100

500 T3

100

HD653-2c CP VARITHERM …BI page 1/ 3

INTERTEC Instrumentation Ltd. · 225 Henry Drive · Sarnia, Ontario N7T 7H5 · Canada · [phone] · [e-mail]

www.intertec.info

CP VARITHERM … BI Electric heater

6 Options

AM Failure alarm opening at < 5 °C
3M Connection cable 10’/ 3 m long
120V Nominal voltage 120V AC
240-265V Nominal voltage 240-265V AC
MB Stainless steel mounting bracket (bow-type)
MW Stainless steel mounting brackets

7 Installation

Trouble-free installation, e.g. on a mounting plate or the
INTERTEC mounting system (C-rails) in the instrument
enclosures or protective cabinets, is possible.
During installation, attention should be paid to the following:

 Follow the installation and operating instructions supplied

with the VARITHERM heater.

 The fins must be positioned vertically
 Please note minimum clearances to the enclosure, as per

7.1 and 7.2

 For temperature maintenance install the TAE thermostat

on the heater, see 7.2

 The label must be clearly legible

7.1 For North America with conduit

Horizontal installation (recommended)

7.2 IEC/ ATEX, with external TAE

Horizontal Installation

Vertical Installation

TAE

TAE

min.

2”/50 mm

Vertical Installation

min.
1”/30mm

min.
1”/30 mm

TS

TS

min.
2”/50 mm

Note: The convection is about 20% less at vertical installation.
Due to earlier switching of the thermostat the effective heating
power may be lower.

The brackets in zinc coated steel and fixing bolts illustrated
above are included with the heater.
Furthermore, a short threaded rod for mounting the TAE
thermostat on the heater is supplied with the TAE.

HD653-2c CP VARITHERM …BI page 2/ 3

INTERTEC Instrumentation Ltd. · 225 Henry Drive · Sarnia, Ontario N7T 7H5 · Canada · [phone] · [e-mail]