Flammable Gas Detection System

Positions of the Detection Heads

serial
number ¹⁾ red label
number calibrated²⁾
for alarm level
2 / 3
[% LEL³⁾] date of
last
calibration position

Bld. 908, gas cylinder storage

729 00 Methane 15 / 30 -⁴⁾ upper ventilation,
above CF₄ supply racks

730 01 Isobutane 15 / 30 -⁴⁾ lower ventilation,
above Neon supply

731 02 Methane 15 / 30 -⁴⁾ upper ventilation,
above empty supply

732 03 Isobutane 15 / 30 -⁴⁾ bottom ventilation,
above Isobutane supply

733 04 Methane 15 / 30 -⁴⁾ upper ventilation,
above Methane supply

Bld. 888, gas mixing zone

735 08 Isobutane 10 / 20 April 2002 primary supply rack,
bottom

737 10 Isobutane 10 / 20 April 2002 DC / MicroMega supply,
bottom

785 30 Methane 5 / 10 April 2002 ventilation hood no.1
(RICH CsI, MW2)

784 29 Methane 5 / 10 April 2002 ventilation hood no.2
(primary supply rack, top)

783 28 Methane 5 / 10 April 2002 ventilation hood no.3
(MW1)

782 27 Ethane 5 / 10 April 2002 ventilation hood no.4
(DC, MicroM)

Bld. 888, RICH test area

- - (Methane) 10 / 20 April 2002 sensor dismounted

Bld. 888, experimental hall

739 14 Isobutane 10 / 20 April 2002 MicroMega and DC,
below PT platform
(upstream of SM1)

740 15 Methane 10 / 20 April 2002 at RICH CSI, bottom, Jura side

742 17 Methane 10 / 20 April 2002 at RICH CSI, top, Jura side

741 - Isobutane 10 / 20 April 2002 MW2

842 (?) - Methane 10 / 20 May 2002 MW2

736 - Methane 10 / 20 May 2002 MW2

? 20 Ethane ? - sampling system: DC2 & DC3
(downstream SM1), top, Jura side ⁵⁾

738 11 Methane 10 / 20 April 2002 sampling system: DC3, (downstream
of SM1), on the floor, Jura side ⁵⁾

¹⁾: serial numbers are of the type: CDGA-00xxx
²⁾: the heads are most sensitive for this type of gas, but can also detect the other types of flammable gases which are used at COMPASS (higher concentration of the gas is needed, so it takes longer until the alarm is triggered)
³⁾: Lower Explosive Level (The ignition ranges in the air are for Methane: 4.4% ... 16.4%, for Ethane: 2.7% ... 14.7% and for Isobutane: 1.3% ... 8.5%)
⁴⁾: not under the responsibility of NA58
⁵⁾: only intake nozzle, the sensor itself is located outside the experimental area, near the alarm panel

This page was last updated on April 24, 2003 by Christoph Ilgner

serial number ¹⁾	red label number	calibrated²⁾ for	alarm level 2 / 3 [% LEL³⁾]	date of last calibration	position
Bld. 908, gas cylinder storage
729	00	Methane	15 / 30	-⁴⁾	upper ventilation, above CF₄ supply racks
730	01	Isobutane	15 / 30	-⁴⁾	lower ventilation, above Neon supply
731	02	Methane	15 / 30	-⁴⁾	upper ventilation, above empty supply
732	03	Isobutane	15 / 30	-⁴⁾	bottom ventilation, above Isobutane supply
733	04	Methane	15 / 30	-⁴⁾	upper ventilation, above Methane supply
Bld. 888, gas mixing zone
735	08	Isobutane	10 / 20	April 2002	primary supply rack, bottom
737	10	Isobutane	10 / 20	April 2002	DC / MicroMega supply, bottom
785	30	Methane	5 / 10	April 2002	ventilation hood no.1 (RICH CsI, MW2)
784	29	Methane	5 / 10	April 2002	ventilation hood no.2 (primary supply rack, top)
783	28	Methane	5 / 10	April 2002	ventilation hood no.3 (MW1)
782	27	Ethane	5 / 10	April 2002	ventilation hood no.4 (DC, MicroM)
Bld. 888, RICH test area
-	-	(Methane)	10 / 20	April 2002	sensor dismounted
Bld. 888, experimental hall
739	14	Isobutane	10 / 20	April 2002	MicroMega and DC, below PT platform (upstream of SM1)
740	15	Methane	10 / 20	April 2002	at RICH CSI, bottom, Jura side
742	17	Methane	10 / 20	April 2002	at RICH CSI, top, Jura side
741	-	Isobutane	10 / 20	April 2002	MW2
842 (?)	-	Methane	10 / 20	May 2002	MW2
736	-	Methane	10 / 20	May 2002	MW2
?	20	Ethane	?	-	sampling system: DC2 & DC3 (downstream SM1), top, Jura side ⁵⁾
738	11	Methane	10 / 20	April 2002	sampling system: DC3, (downstream of SM1), on the floor, Jura side ⁵⁾