ELECTRICAL CONNECTIONS 3
31
OPTIMASS / 400
www.krohne.com10/2022 - 4003491806- AD OPTIMASS 400 Atex R06 en
3.1.1 Separated systems
In the case of field and remote meters, the sensor and converter are connected using a cable
that has five pairs and an outer screen. Each pair of cables carries an intrinsically safe circuit
When using cable not supplied by the manufacturer, the following points should be noted:
• The cable MUST NOT have capacitance and / or inductance levels higher than those shown in
the cable parameters section.
• You MUST obey IEC / EN 60079-14 when installing an OPTIMASS meter.
3.1.2 Cable parameters
For applications where the temperature gradient means that the standard cable is not suitable,
an alternative (accessory) cable is available from the manufacturer. The cable is available as
either (GSWA) armoured or non-armoured. If the armoured cable option is ordered, a suitable
dual rated cable gland is also available.
For more information, please contact the manufacturer.
Cable supplied by the manufacturer
Standard cable Accessory cable
Cable type Type A acc. to IEC60079-14:2014 Cl, 16.2.2.8
Capacitance
<78 ρF/m <78 ρF/m
Inductance <0.8 µH/m <0.8 µH/m
Temperature range -40°C...+85°C -75°C...+105°C
Maximum length 20 meters 1 20 meters 1
Cable supplied by the customer
Cable type Type A acc. to IEC60079-14:2014 Cl, 16.2.2.8
Capacitance 90 nF (for total cable length)
2
Inductance 36 µH (for total cable length)
Temperature range
≥ Max temperature range of the installation 3
Test voltage
≥ 1000 VAC ≥ 1000 VAC
Insulation thickness
≥ 0.2mm (IEC / EN 60079-14 S. 12.2.2.7)
Casing colour Blue Blue
1 No further intrinsic safety analysis is necessary if the cable length is not more than the maximum
2 No further intrinsic safety analysis is necessary if the cable used is within maximum limits
3 When calculating the temperature range, give consideration to the flow sensor temperature gradients. Please refer to
the Temperature limits section.
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