Hazardous area Safe area MTL2211 SWITCH OPERATED RELAY 2-channel + 1 9 2 10 Load, alarm 3 11 or shutdown 4 12 circuits } 5 13 The MTL2211 enables two 500VA safe-area loads to be controlled 6 14 independently through two relays by two light-duty on/off switches in L + 7 15 a hazardous area. The two input circuits are independently fully – 8 16 N 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 Fail-safe protection operation of medium-powered electrical equipment such as alarms, lights, and small electrical motors, or contactors for controlling higher- powered equipment. SPECIFICATION 1 9 See also ‘Common specification’ 2 10 Load, alarm 3 11 or shutdown 4 12 circuits Number of channels + } 5 13 Two, independently fully floating 14 6 L Location of switches + 7 15 Zone 0, IIC, T6 hazardous area 8 16 – N MTL4220 Div 1, Group A, hazardous area Voltage applied to each switch No-fail protection 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) All contacts shown in alarm condition (relay de-energised) 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 5 3 x 10 operations 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) V = 8.3V, I = 21.7mA, C = 5.5µF, L = 75mH oc sc a a EUROPE (EMEA) Tel: +44 (0)1582 723633 Fax: +44 (0)1582 422283 AMERICAS Tel: +1 603 926 0090 Fax: +1 603 926 1899 Oct 2004 ASIA PACIFIC Tel: +65 487 7887 Fax: +65 487 7997 E-mail: enquiry@mtl-inst.com Web site: www.mtl-inst.com