MTL Repearter Power Supply, 4/20mA MTL3046B

MTL Repearter Power Supply, 4/20mA MTL3046B

MTL Repearter Power Supply, 4/20mA MTL3046B

MTL Repearter Power Supply, 4/20mA MTL3046B

Description
The MTL3046B performs a similar function to the MTL3041, but is tailored for use with ‘smart’ transmitters whose digital communication signals are superimposed on a standard 4/20mA analogue signal. The unit provides a minimum of 15V at 20mA to energise the transmitter while at the same time repeating the current accurately in a separate circuit to drive a load in the safe area. The transmitter can be calibrated, interrogated or tested from the host computer, or by using a hand-held communicator connected in either the safe or hazardous area. The MTL3046B is a development of the MTL3046, which it replaces, and it is compatible with the majority of ‘smart’ transmitters available. 
MTL Repearter Power Supply, 4/20mA MTL3046B

Specification
See also 'Common specification'
Number of channels
One, fully floating
Location of transmitter
Zone 0, IIC, T4–6 hazardous area if suitably certified
Div 1, Group A, hazardous location
Voltage available for transmitter and lines
15V minimum at 20mA
Note: maximum open-circuit voltage is 28V
Maximum permitted line resistance
[(15 minus transmitter voltage requirement) x 50] Ω
Input and output signal range
4 to 20mA with superimposed digital signal
Digital signal bandwidth (safe area to hazardous area)
10Hz to 8kHz
Digital signal bandwidth (hazardous area to safe area)
dc to 10kHz
Input resistance (terminals 6 & 8)
≤30Ω (600mV at 20mA)
Safe-area circuit load resistance
20 to 750Ω (250Ω ±10% for digital communications)
Safe-area circuit output resistance
>1MΩ
Safe-area circuit ripple
<160µA peak-to-peak
DC transfer accuracy at 20°C
Better than 20µA
Temperature drift
<1µA/°C
Response time
Settles to within 10% of final value after typically 40µs
MTL Repearter Power Supply, 4/20mA MTL3046B

Other application
Although designed for ‘smart’ transmitter applications, the MTL3046B operates with standard analogue 4/20mA transmitters, and therefore can be especially useful if upgrading later to ‘smart’ transmitters. The MTL3046B can be used to repeat a current generated by hazardous-area equipment in an existing barrier-protected safe-area circuit, to provide a fully isolated output with a high load handling capability.
The MTL3046B operating with an MTL3045 can pass measurement and control signals through a hazardous area separating two safe areas (see MTL3045). 

The frequency response of dc to 10kHz (hazardous to safe area) makes the MTL3046B ideal for some flowmeter applications such as vortex and turbine meters.
MTL Repearter Power Supply, 4/20mA MTL3046B