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　　TRIP AMPLIFIER, 4/20mA, for 2- or 3-wire transmitter

　　The MTL5314 connects to a 2- or 3-wire 4/20mA transmitter or current source located in the hazardous area. It supplies one or two configurable alarm signals to the safe area via changeover relays. Each relay may be configured individually to signal an alarm condition (relay de-energised) when the input signal is greater than or less than a pre-set value.

　　In addition, the MTL5314 can be connected in series to the hazardous-area side of an MTL5541 4/20mA repeater power supply (or equivalent device) to provide two trip alarm outputs direct from the transmitter signal (see schematic diagram). Looping the transmitter signal through the MTL5314 (via terminals 1 and 3) does not affect HART® communications.

　　SPECIFICATION

　　See also common specification

　　Number of channels

　　One, with two configurable alarms

　　Location of field equipment

　　Zone 0, IIC, T4–T6 hazardous area, if suitably certified

　　Div 1, Group A, hazardous location

　　Safe-area output

　　Two relays with changeover contacts

　　Hazardous-area input

　　Signal range: 0 to 24mA (including over-range)

　　Voltage available for transmitter (terminals 1 and 2)

　　>17V at 20mA

　　Current input (terminals 1 to 3)

　　Input resistance 25Ω maximum

　　Response time

　　<75ms

　　Trip-points

　　Trip-points can be adjusted by the user via multiturn potentiometers accessible on the top of the unit. Trip-point range 0.5 to 22mA Effective resolution 20μA Trip-point drift with temperature 1.5μA/°C max. Hysteresis min 1% of trip-point range max 1.7% of trip-point range

　　Relay type

　　Single pole, changeover contacts Note: reactive loads must be adequately suppressed

　　Relay characteristics

　　Contact rating 250V ac, 2A, cosø >0.7 40V dc, 2A, resistive load Contact life expectancy 3.3x105 operations

　　LED indicators

　　Power LED green, illuminated when the power is connected to the module Status LED yellow, one per trip, illuminated when relay is energised (not tripped)

　　Supply voltage

　　20 to 35V dc

　　Maximum current consumption (with 20mA signal)

　　85mA at 24V 100mA at 20V 60mA at 35V

　　Maximum power dissipation within the unit

　　(with 20mA signal) 1.7W at 24V 1.8W at 35V

　　Safety description

　　Terminals 2 to 1 and 3 28V, 300Ω, 93mA

　　Terminals 1 and 3

　　These terminals meet clause 5.4 of EN50020 : 1994 and have the following parameters: U ≤ 1.5V, I ≤ 0.1A, P ≤ 25mW. They can be connected without further certification into an IS loop with open circuit voltage of not more than 28V. See certificate for further details.