KROHNE OPTISONIC 7300 Ex EN - Manual (Page 16)

2
TEMPERATURE LIMITS
16
OPTISONIC 7300 / 8300
www.krohne.com 05/2012 - 7312262200 - AD EX OPTISONIC 7300/8300 R02
2.1 General
Due to the influence of the process medium (gas) temperature, ultrasonic flow sensors in
separate version with type designation OPTISONIC 7000...-Ex and ultrasonic compact gas flow
meters with type designation OPTISONIC 7300 C/...-Ex are not allocated to any fixed
temperature class.
The temperature limits apply under the following conditions:
• The instrument is installed and operated in accordance with the installation directions given
in the quickstart and / or handbook.
• The instrument is not heated up by any additional heat radiation (direct solar radiation, heat
from adjacent plant parts) so causing it to operate above the permissible ambient
temperature range.
• Insulation is not hindering free ventilation of the ultrasonic signal converter housing.
2.2 GFC 300 F/...-Ex
The GFC 300 F/...-Ex signal converter has a temperature classification of T6 (85°C). The
permissible ambient temperature is dependent on the material that the electronics housing is
made of, namely:
• die-casted aluminum: -40...+65ºC
• die-casted stainless steel: -40...+55ºC
2.3 OPTISONIC 7300 C/...-Ex
The OPTISONIC 7300 C/...-Ex ultrasonic compact gas flow meter is provided with the same
electronics housing as the GFC 300 F/...-Ex and therefore has the same ambient temperature
range of -40...+65°C (aluminum housing) and -40...55°C (stainless steel). The temperature
classification table shows the relationship between the maximum process medium
temperatures at a certain maximum ambient temperature.
CAUTION!
The temperature data below only applies to the meters with ultrasonic gas transducers made of
titanium (types G7.01 and G7.04). For the partly encapsulated transducer types G5.nn and G6.nn,
refer to Technical data on page 10
.
CAUTION!
The temperature data below only applies to the meters with ultrasonic gas transducers made of
titanium (types G7.01 and G7.04). For the partly encapsulated transducer types G5.nn and G6.nn,
refer to Technical data on page 10
.
Temperature class Maximum process temperature [ºC] at
T
a
= 40ºC T
a
= 50ºC T
a
= 65ºC (55ºC)
T6 80 80 80
T5 95 95 95
T4 130 130 125
T3 180 165 125