MTL Instruments MTL2211 Data sheet

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Oct 2004

MTL2211 SWITCH
OPERATED RELAY

2-channel

SPECIFICATION

See also ‘Common specification’

Number of channels

Two, independently fully floating

Location of switches

Zone 0, IIC, T6 hazardous area
Div 1, Group A, hazardous area

Voltage applied to each switch

2.5V dc from 680Ω

Input/output characteristics (each channel)

Relay energised if <200Ω in switch circuit
Relay de-energised if >500Ω in switch circuit
Hysteresis, nominal 100Ω

Power supply failure protection

Both relays de-energised if supply fails

Broken line protection (each channel)

Relay de-energised if either line broken

Fail-safe earth fault protection (each channel)

(Enabled by connecting terminal 3 or 7 to earth)
Relay de-energised if <1kΩ to earth, total for both lines
Relay not de-energised if >7.5kΩ to earth, total for both lines

‘No-fail’ earth fault protection (each channel)

(Enabled by connecting terminal 3 or 7 to MTL4220)
Fault on either line proclaimed: unit continues working

Response time (each channel)

50ms, nominal

Contacts (each channel)

1-pole changeover, duplicated within unit

Contact rating

250V:5A:500VA (ac), resistive loads, reactive loads must be
suppressed
250V:5A:250W (dc), resistive loads, reactive loads must be
suppressed

Contact life expectancy

3 x 105operations at maximum load

LED indicator (each channel)

ON when associated relay energised (safe condition)

Consumption

1.7 to 2.5W (ac versions)
110mA (24V dc version)

Ambient temperature limits

–20 to +50°C (ac versions, close packed)
–20 to +45°C (24V dc versions at 26V, close packed)
–20 to +60°C (all versions, at least 5mm apart)
–40 to +80°C (all versions, storage)

Safety description (each channel)

7V, 300Ω, 22mA

FM max entity parameters (each channel)

Voc= 8.3V, Isc= 21.7mA, Ca= 5.5µF, La= 75mH

Load, alarm
or shutdown
circuits

Fail-safe protection

No-fail protection

Load, alarm
or shutdown
circuits

All contacts shown in alarm condition (relay de-energised)

The MTL2211 enables two 500VA safe-area loads to be controlled
independently through two relays by two light-duty on/off switches in
a hazardous area. The two input circuits are independently fully
floating and are unaffected by each other. Each relay is provided with
two sets of changeover contacts, which are connected in parallel
within the unit for maximum reliability. Applications include the
operation of medium-powered electrical equipment such as alarms,
lights, and small electrical motors, or contactors for controlling higher­powered equipment.

MTL4220

L

N

L

N

Hazardous area

Safe area

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