WIKA RTD User Manual

WIKA operating instructions RTD and TC, intrinsically safe designs
3345267.08 06/2011 GB/D
23
GB
When housings are used, they must either have their own suitable approval or comply with the
minimum requirements. IP protection: at least IP 20 (at least IP 65 for dust), applies to all housings.
However, light metal housings must be suitable in accordance with EN/IEC 60079-0 Section 8.1.
In addition, non-metallic housings or powder-coated housings must meet the requirements of
EN/IEC 60079-0 or have a suitable warning note.
Protective measures for applications that require EPL Ga or Gb:
Operational friction or impact between equipment parts made of light metals or their alloys (e.g.
aluminium, magnesium, titanium or zirconium) with equipment parts made of iron/steel is not
permitted. Operational friction or impact between two light metals is permitted.
7.1.2 Ex marking
For applications without transmitter (digital displays) requiring instruments of equipment Group II
(potentially explosive gas atmospheres), the following temperature class classication and
ambient temperature ranges apply:
Table 1
Marking Temperature
class
Ambient tempera-
ture range (T
a
)
Max. surface temperature (T
max
)
at the sensor or thermowell tip
II 1G Ex ia IIC T6 Ga
II 1/2G Ex ib IIC T6 Ga/Gb
T6 (-50)
1)
-40 ... +80 °C
T
M
(temperature of the medium) +
self-heating
For this, the special conditions (17)
must be observed.
II 1G Ex ia IIC T5 Ga
II 1/2G Ex ib IIC T5 Ga/Gb
T5
(-50)
1)
-40 ... +95 °C
II 1G Ex iaD IIC T4 Ga
II 1/2G Ex ib IIC T4 Ga/Gb
II 1G Ex ia IIC T3 Ga
II 1/2G Ex ib IIC T3 Ga/Gb
T4, T3 (-50)
1)
-40 ... +100 °C
1) The values in brackets apply to special designs. These sensors are manufactured using special sealing com-
pounds. Moreover, they feature housings made of stainless steel and cable glands for low-temperature ranges
When there is a built-in transmitter and/or a digital display, the special conditions from the type
examination certicate (see item 17) apply.
7. Information on mounting, operation in hazardous areas (Europe)

WIKA RTD Specifications

General

Brand	WIKA
Model	RTD
Category	Measuring Instruments
Language	English