Heinrichs Messtechnik GmbH
EX-Supplementary Operating Manual
HPC Mass Flow Meter
Page 9 of 20
4.3
Mounting and Installation
The mounting instructions for the standard sensor also apply to the explosion-proof sensor.
4.3.1
Thermally insulated sensor
In explosive atmospheres the sensor may also be outfitted with thermal insulation. However, so not to impair the
sensors thermal ratings, the sensors neck cooling ribs of the high-temperature version shall not be included in
the insulation. The connector of the standard version may be completely enveloped by the insulating material.
4.3.2
Heated sensor
The sensor can be externally heated to avoid crystallization in the flow tube. Any heating technique or device
can be used. When using electrical heating devices, these must be suitable for use in the potentially explosive
environment present.
It is the operator’s responsibility to ensure that the heating temperature does not exceed the maximum
allowable temperature for the fluid and/or the maximum allowable temperature range for the potentially
explosive atmosphere in which the device is being operated.
The maximum allowable temperature range for the fluid is indicated on the sensors rating plate. It is also the
operator’s responsibility to ensure that no hazards are created by hot surfaces pursuant to EN 1127-1
(Explosive atmospheres – Explosion prevention and protection) paragraphs 5.2 and 6.4.2.
4.3.3
Connection sensor – transmitter
The associated transmitter used in connection with the HPC sensor must be listed in the country of intended
installation. The installation drawings provided by the manufacturer must be observed! It is essential that the
output parameters of the converter match the input parameters of the sensor.
The dedicated cable SLI2Y (SP) CY 5 x 2 x 0.5 mm² [blue] is to be used for the electrical connection between
sensor and the remote mounted transmitter. This cable, which is available from Heinrichs Messtechnik, has
five twisted wire pairs, each of which has a foil shield, and a tinned copper strand wound around each pair.
These tinned copper strands are twisted together are installed in the “shield” terminal of the transmitter. All 5
cable pairs are shielded by a further tinned copper wire mesh. This outer cable shield is connected to the
transmitters housing, via a dedicated EMC cable fitting, as well as to the outer-casing of the sensor’s
connector thus ensuring optimum noise immunity.
Image 3: Heinrichs standard SLI2Y (SP) CY 5 x 2 x 0.5 cable with HAN R23 connector
