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Field Tools
101-0028
24V Supply
Operation &
Specifications
Manual
General Description
The Field Tools 24V Supply provides portable power to loop powered devices.
It is a fully contained power source that takes the low voltage from three "AAA"
alkaline batteries and increases it to a highly fi ltered 24 volts DC. Using batteries
for the power source eliminates isolation concerns as well as the need for a
power connection to AC or a USB port. The voltage conversion is done using
a high effi ciency switching DC-DC converter to maximize battery life. Simply
connect the two mini-clips to the power input of your loop powered device.
A push-button is used to enable or disable the 24 volts while a status LED
indicates the active operating mode. An internal 250 ohm loop resistor, HART
protocol modem clip points, and current meter leads with standard banana jacks
make the 24V Supply a complete loop transmitter power solution.
620-0012 R2a © Microfl ex, LLC 2015
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Table of Contents
Summary of Contents for Microflex 101-0028
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Page 1: General Description
Field Tools 101-0028 24V Supply Operation & Specifications Manual General Description The Field Tools 24V Supply provides portable power to loop powered devices. It is a fully contained power source that takes the low voltage from three “AAA” alkaline batteries and increases it to a highly fi ltered 24 volts DC. Using batteries for the power source eliminates isolation concerns as well as the need for a power connection to AC or a USB port. -
Page 2: Safety Considerations
24V Supply Features • Highly fi ltered 24 volt power source for loop devices • Up to 30mA capacity, perfect for 4-20mA transmitters • Battery power eliminates galvanic isolation concerns • Includes an internal 250 ohm loop resistor to allow for HART protocol •... - Page 3 24V Supply Block Diagram 24 VOLT TRANSMITTER POWER HIGH EFFICIENCY FILTER SUPPLY LEADS DC-DC CONVERTER MILLIAMP METER TEST LEADS CURRENT BATTERY MONITOR MONITOR CONTROLLER HART PROTOCOL STATUS LED MODEM CONNECTIONS CONNECT / OFF BUTTON Figure 1: Block Diagram Connecting to a Loop Device The Field Tools 24V Supply is a fully contained power source for loop powered transmitters.
- Page 4 Measuring Loop Current The 24V Supply includes leads to simplify connection to a DC current meter for loop current measurements. The current meter leads have safety insulated banana plugs that can be plugged directly into a standard current meter. An internal diode allows the meter to be connected or disconnected without inter- rupting the loop supply or opening the loop.
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Page 5: Status Led Operation
Status LED Operation The Status LED provides quick feedback of the 24V Supply operating mode. The LED can indicate when the battery is getting low and needs to be replaced or when the output is shorted or connected to a load that exceeds the 30 milli- amp maximum. -
Page 6: Specifications
Specifications Output Open Loop Voltage ..............24V +/- 2% Load Regulation .................0.25% Noise ............Less than 50mV P-P @ 20mA Current ..................30mA max Short Circuit / Overload Protection ..Auto-disconnect if load is > 30mA Leads ..........3’ (1 meter) high fl exibility test lead wire Termination ..............Mini-Grabber clips Current Meter Leads Leads ......... - Page 7 Dimensions (-) LOOP POWER STATUS LED + LOOP POWER CONNECT BUTTON HART CLIP (-) CURRENT METER 1.700 + CURRENT METER 43.18 mm 3.250 82.55 mm 1.125 28.58 mm BATTERY COVER SCREWS 36" 915 mm 24" 610 mm Figure 3: Dimensions...
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Page 8: Limited Warranty
NO WARRANTIES OR MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE. CUSTOMER’S RIGHT TO RECOVER DAMAGES CAUSED BY FAULT OR NEGLIGENCE ON THE PART OF MICROFLEX, LLC SHALL BE LIMITED TO THE AMOUNT THERETOFORE PAID BY THE CUSTOMER. MICROFLEX, LLC WILL NOT BE LIABLE FOR DAMAGES RESULTING FROM...
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