31
8020216/19YN/V3-0/2020-12| SICK
O P E R A T I N G I N S T R U C T I O N S | DUSTHUNTER SP100 Ex-3K
Subject to change without notice
PRODUCT DESCRIPTION
3
3.3.6
Flange with tube
The flange with tube is attached directly to the gas duct of the measuring point and is used
to mount the sender/receiver unit.
3.3.7
Non-return valve
The non-return valve protects the sender/receiver unit against high temperatures and
sample gas for a short time (up to 15 minutes) should the purge gas supply fail.
Purge gas supply
The sender/receiver unit must be purged with onsite purge gas. Purging protects the opto-
electronic components from contamination and excessive gas temperatures. Take into
consideration that purge gas consumption is higher in the high-temperature version (
).
The manufacturer recommends the use of a float-type flowmeter and a pressure reducer
(
see “DHSP-T2VxxEX-3K sender/receiver unit”, page 25
) to adjust and control the purge
gas volume, because an undersupply or failure of the purge gas supply can lead to
equipment damage. If necessary, an additional nozzle can be used to stabilize the purge
gas volume.
Purge gas hose (antistatic)
The purge gas hose is used to supply purge gas to the sender/receiver unit. On the device
side, the purge gas hose is connected to the G¼" non-return valve. The operator must
ensure a suitable and uninterrupted purge gas supply (
see “Purge gas supply”, page 45
),
including a suitable purge gas hose. Due to the danger of explosion in the event of electro-
static discharge, it is imperative that a purge gas hose made of a material that prevents
static charging is provided.
WARNING:
Risk of explosion through purge gas failure
Explosive gases may escape in case of purge gas failure.
▸
The sender/receiver unit must be disconnected immediately from the power supply
when a purge gas failure occurs.
▸
To avoid damage to the device, the sender/receiver unit must be removed from the
duct, but only if this does not create a risk of explosion or danger to employees.
NOTICE:
Device damage possible in case of purge gas failure
During longer operation (up to15 minutes) without purge gas supply, there is a risk that
components relevant to ignition protection (seals and adhesives) may lose their sealing
function or fatigue strength completely or partially. If the device is connected to the duct
without purge gas supply for a longer period of time, the device must be sent to the
factory immediately for testing.
