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