KROHNE OPTITEMP TCA Ex EN - Manual (Page 20)

2
DEVICE DESCRIPTION
20
OPTITEMP TRA/TCA
www.krohne.com 10/2010 - 4001087001 - Ex AD OPTITEMP TRA/TCA R02 en
2.8 Electrical data
DANGER!
Connect the sensor circuit of an industrial thermometer only to intrinsically safe circuits as well
as separate transmitters certified as intrinsically safe or zener barriers. Observe the following
maximum values when connecting a measuring insert without temperature transmitter:
• U
i
= 30 V
• I
i
= 140 mA
• P
i
= 1.0 W
DANGER!
When connecting a thermometer to an electricity supply please observe the maximum values for
the effective capacities and inductances in the following table:
Sensor length
up to 5 m / 16.4 ft up to 30 m / 98.4 ft
C
i
= [nF] L
i
= [µH] C
i
= [nF] L
i
= [µH]
TR100 with Pt100 wire wound 3.5 65 21 390
TC100 type K 2.5 25 14 150
TC100 type J 2 48.5 11.5 289.5
DANGER!
Always observe the maximum values of the transmitter used with industrial thermometers
featuring a measuring insert with head-mounted transmitter. These maximum values can be
found on the transmitter nameplate. The sensor output P
o
is one of the the deciding factors
when assigning to a temperature class . For further information refer to Temperature classes
on page 11.
.book Page 20 Friday, November 19, 2010 2:23 PM