DA149 Intrinsically Safe Relays - RTK - (Version JPG) - Page n° 2 - PDF Catalogue | Technical Documentation

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Specification

Operating principle Each relay is a solid-state device consisting of an oscillator and an intrinsically safe transformer to provide the necessary isolated coupling to a MOSFET switch. For all practical purposes, each can be regarded as a coil and a normally open contact. Diodes are connected in series with the hazardous-area input and/or output terminals to make them electrically equivalent to 'simple apparatus', i.e they can be included in any IS loop without further certification. Inputs and outputs are galvanically isolated so the relays do not need IS earthing.

Power requirements

The only power required is less than 60uA at 4V to energise the 'coil', by comparison with certified opto-isolators or relays which need at least 10mA to function, so the relays can be used in virtually any loop-powered systems without affecting operation.

Electrical Safety

Relay Choice

Non energy storing simple apparatus (hazardous-area terminals will not generate or store more than 1.2V, 0.1A, 20uJ, or 25mW when connected to IS equipment with a Umax of not more than 40V (30V for the DAD149)

EMC compliance

Immunity to EN61000-6-2:2001

Emissions to EN61000-6-4:2001

Maximum cable parameters

Always defined by associated circuits

Terminals

For conductors up to 2.5mm²Construction

Resin-filled polyamide casing Mounting

DIN rail to EN50035 DIN46277-1 ('G' profile) or EN50035 DIN46277-3 ('Top-hat' profile)

The safe-area mounting relays are the DAA149 and DAE149 units. The DAA149 transfers signals from the hazardous area to the safe area while the DAE149 transfers signals the other way. The DAE149 is fitted with a 250mA fuse.

The two models that can be located within the hazardous area are the DAB149 fitted with a 100mA contact fuse certified for use in ambient temperatures up to 40°C and the DAD149 fitted with a 50mA fuse and certified for ambient temperatures up to 70°C.

Ordering Information

DAA149 IS relay, Zone 0 to safe area

DAB149 IS relay, Zone 0 to Zone 0 (100mA fuse, 40°C)

DAD149 IS relay, Zone 0 to Zone 0

(50mA fuse, 70°C)

DAE149 IS relay, safe area to Zone 0 (250mA fuse)


Electrical Specification
	DAA149	DAB149	DAD149	DAE149
Location	Safe area	Zone0	Zone 0	Safe area
Protection	IP20	IP20	IP20	IP20
Ambient temp. limits	-20-70°C	-20-40°C	-20-70°C	-20-70°C
Relative Humidity	5-95%	5-95%	5-95%	5-95%
Coil terminals
Connections to (area)	Zone0	Zone 0	Zone 0	Safe area
Min. voltage (VDC [VAC rms]) 4 [10]		4 [10]	4 [10)	4[10]
Max. voltage (VAC/DC)	40	40	40	250
Min. current (uA)	60	60	60	20
Current at Vmax (mA)	3	3	3	0.07
Contact terminals
Connections to (area)	Safe area	Zone 0	Zone 0	Zone 0
'On' resistance (££)	30	30	15	30
'On'voltage (V)	0	2.1	2.1	2.1
'Off' resistance (k££)	>10000	60	60	60
Max. voltage (V)	52	40	30	40
Imax (mA)	90	90	45	225

3D -O




	r Ì	+ 2

'Coil' 'Contacts'

Equivalent Circuit

Approvals

BASEEFA to CENELEC standards Model Standard Certificate

Approved for

DAA149 EN50020

DAB149 EN50020

DAD149 EN50020

DAE149 EN50020

Baseefa03ATEX0624 Baseefa03ATEX0625X Baseefa03ATEX0625X Baseefa03ATEX0624

[EExia]IICT_amb70°C EExiaIICT4T_amb 40°C EExiaIICT5T_amb70°C [EExia]IICT_amb70°C

Due to our policy of continuous product development, we reserve the right to amend specifications without notice.

RTK Instruments Limited St James Business Park, Knaresborough, North Yorkshire, England. HG5 8PJ

Telephone: +44 (0)1423 580500 Facsimile: +44 (0)1423 580501 Web: www.rtkinstruments.com Email: enquiry@rtkinstruments.com

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DA149 Intrinsically Safe Relays - RTK - #2

LED indicator, LED, LED beacon, Alarm annunciator, Sounder