Medical RF Filters

Key Features

• Filter models to match requirements for:
  • power and lighting
  • low leakage
• 100dB insertion loss from 40kHz
• Voltage drop less than 1% of applied voltage
• Compliant with:
  • Low Voltage Directive 2006/95/EC
  • MIL-STD-220C
• UL 1283 listed, 5th edition

Description

Below are the most common Medical RF filters used, however ETS-Lindgren can provide virtually any filter you may need. UL, ULC and CE filters are also available, including low current leakage filters.

 

ETS-Lindgren Medical RF Filters enable services for lighting, power, fire detection, switching and data signals to be utilized inside the MRI room.

Description

Facility filters allow specified frequencies to pass while suppressing or attenuating other frequencies. The filters listed as ELUL, EQ and LMF are our most common models utilized in medical applications. There are many other versions of RF filters also available for a wide variety of applications. Our complete line of RF filters incorporates a wide array of choices which provide effective EMI/RFI shielding to meet or exceed industry standards.

Features

The LMF-4112 is a versatile filter that is utilized for standard lighting, switching and power circuits. This filter offers the advantage of an approximately 50% reduction in required surface area and weight. This means the use of more circuits with substantially less space and weight than standard filters offering the same features. This filter has a 0-30 amp rating and operates at 250 VAC/VDC. It is c-UL rated and CE marked.

The EQ series are used for conventional thermostats, nurse calls, fire alarms, smoke detectors or any low leakage application requiring measurement of small variances in voltage to perform an application. This series of filters has an operating range of 1-30 amps and 250 VAC/VDC. It is also c-UL rated and CE marked.

The ELUL filters are utilized for standard lighting, switching and power circuits. They are able to run at higher voltage requirements with a 0-30 amp range and operating up to 277 VAC and 480 VDC. It is c-UL rated and CE marked.

Applications

ELUL, LMF and EQ filters are utilized to allow electrical services within a Magnetic Resonance Imaging suite. All applications that require a conductor within the room interface with a filter. The most common services are lighting, power, smoke detectors and fire alarms.

Model	ELUL-2030 (Power,Light)	EQ-2001-NR (Smoke, Fire, Thermo.)	EQ-2010-1C (ERDU, EPO)	LMF-3519 (CCTV)
Part Number	250902	254757	250891	256109
Rated Currents (amps)	0-30	0-1.0	0-10	0-.10
Number of Lines	2	2	2	1
Approx. Weight(lbs.)	15	6	6	6

Dimensions

Model	ELUL-2030	EQ-2001-NR	EQ-2010-1C	LMF-3519
Dimensions      A	21.25"	15.25"	15.25"	15.25"
B	20.75"	14.75"	14.75"	14.75"
C	20.00"	14.00"	14.00"	14.00"
D	5.00"	3.00"	3.00"	3.00"
E	3.00"	2.00"	2.00"	2.00"
F	1.56"	1.50"	1.50"	1.50"
G	3.00"	2.00"	2.00"	2.00"

Power Specifications

Max. Leakage Current @220 V, 50 Hz	700 mA	3 mA	3 mA	N/A
Max. Leakage Current @120 V, 60 Hz	450 mA	1.5 mA	1.5 mA	N/A
Rated Voltage	0-277/480 VAC/VDC	0-30/50 VAC/VDC	0-250/250 VAC/VDC	0-24 VDC
Insertion Loss	100 dB min. from 150 kHz to 10 GHz per MIL-STD-220A.	100 dB min. from 150 kHz to 18 GHz per MIL-STD-220A.	100 dB min. from 150 kHz to 18 GHz per MIL-STD-220A.	100 dB min from 30 MHz - 10 GHz per MIL-STD-220A
Voltage Drop	Not to exceed 1% of applied voltage at Unity Power Factor.	Not to exceed 1% of applied voltage at Unity Power Factor.	Not to exceed 1% of applied voltage at Unity Power Factor.	N/A
Safety	Discharge resistors provided per UL-1283.	Discharge resistors provided per UL-1283.	Discharge resistors provided per UL-1283.	N/A
Passband Impedance	N/A	N/A	N/A	75 (L-G)

Standard Configuration

• Mounting tabs provide secure access
• Feedthrough penetration pipe for electrical leads functions as a frequency waveguide cut-off
• Single phase, two line filters
• Seam welded case with removable RF gasketed lid. Tin coated for long wear

Options

• ETS-Lindgren has a large variety of filters designed to meet almost any requirement. We have on-staff electrical engineers to custom design a filter for your application.