TWG_Bourdon_Temperature_switch_Riels0 pages
TWG
BOURDON
TEMPERATURE
SWITCH
TEMPERATURE
Bourdon temperature switch
Weatherproof execution
Electric construction
Electric construction: weatherproof
Degree of protection IP65 (NEMA 4).
Electrical safety class: class I (EN61298-2:1997-06)
Protection mode (option): Intrinsically Safety
GAS Ex-ia IICT6 andT4 - Dust Ex-iaD A20 IP65T85 andTI35.
Enclosure
Case and cover from AISI series 300 stainless steel drawn sheet; bayonet
cover fitted with tamper-resistant lock.
Cable entry: 1/2-14 NPT-F std. - opt. (see point 5 overleaf).
Terminal block: screw-type terminals suitable also for ring terminals.
MIL-UL insulating material.
Earthing screws: one inside, one outside.
Max section of earthing wires: 4 mm2.
Electric contacts
(See point 1.2 overleaf). One or two microswitch SPDT, with fixed or
adjustable dead band.
The function DPDT is obtained by two micro SPDT with simultaneous
action to within 0,2% of span.
Thermal element
Inert gas filled system (classification SAMA NIB) consist of: Bulb AISI 31 6.
Connection AISI 304 compression fitting with adjustable insertion length.
Capillary AISI 3 16 with stainless steel flexible armor
Ranges
From -30 a +600°C (see point 2 overleaf).
Set point
Adjustable throughout the range and, in case of two microswitches, inde-
pendently for each one.
Repeatability: better than 0,5% of span.
Note: when the set point is very close (less then 10% of span) to normal
temperature, the device must be installed in a vibration free location, and
mechanical shocks must be avoided.
Mounting
- Direct, stem type B.
- Remote at surface (std.) or 2" pipe (with optional bracket), stem type C
Ambient temperature (operative limits1):
Ambient temperature: -40/+85°C
Equipment
Certified according to Directive B.T 73/23 CEE ed 93/68 CEE
Directive ATEX 94/9 EC Group II Cat. I GD Annex III and IV.
) In accordance with ISA S5 I.
GAS Ex-ia DUST Ex-iaD
Gr. II Cat. 1 GD
GOST-R
IP65
Dimensions (mm) and weights (kg)
B0 , 73
REMOTE (STEM TYPE "C")
A = bulb connection
E = cable entry
DIRECT (STEMTYPE "B")
Weight: 2,1 kg (K = 2m)
Riels Instruments Sri . W +39 049 896I77I - A +39 049 7l7368 .www.riels.it. info@riels.it
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