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CURRENT MONITOR
- Continuously monitor 0-20 Ampere a.c. at 50Hz
- Produces 4-20mA output signal
- Two sets of output terminals
- Operates from standard 24 Volt d.c. supply
- Small foot print is easy to install
INTRODUCTION
The Current Monitor is designed to continuously measure the current flowing down a load carrying conductor. The conductor passes through the aperture in the case, there is no electrical connection to be made. The current in the conductor is converted into a voltage signal by a current transformer. This voltage is precision full wave rectified, smoothed and amplified to drive a 4-20mA current generator. |
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TECHNICAL SPECIFICATION
Current range
Operating frequency
Power requirement
Current consumption
Output
Output connections
Calibration
Linearity
Temp. coefficient
Power on indicator
Connections
Packaging
Dimensions |
0-20A a.c.
50Hz (60Hz to order)
24V d.c. supply (unit is protected against reverse polarity)
Less than 30mA (at 20mA output)
4-20mA into a maximum load of 750R
Two sets of output terminals are available, each one having it's own
screen connection. The screen terminals are connected together
and connected to the Earth terminal. The two outputs are connected
in series, but O/P 2 has a10 Volt zener diode connected across it.
If O/P 1 only is used and the loop resistance is greater than 400R,
a wire link should be connected between the O/P 2 terminals
0A = 4mA 20A = 20mA
Better than 1%
0.05%/oC typical
A green LED is lit while power is applied
9 way rising clamp terminal block
Mounted in a plastic case with mounting
lugs for base plate or chassis mounting
175 x 84mm overall with fixing holes on a 160mm pitch
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INSTALLATION INSTRUCTIONS
Mounting
The current monitor should be mounted in a metal enclosure using two M4 or similar bolts. The unit is not suitable for mounting in areas where water may get into the unit.
Connections
Pass the load carrying conductor through the hole in the case. Only put one conductor through this hole.
Connect a 24 Volt d.c. supply to the terminals marked +24V and 0V adjacent to the lettering "Supply"
Connect the 4-20mA output/s as required. The terminals marked "Screen" are connected together and to the terminal marked "Earth"
When using only O/P 1, please note that a 10 Volt zener diode is internally connected across O/P 2. If the resistance of the current loop exceeds 400R connect a wire link across O/P 2 terminals to short out this internal zener diode.
Operation
On application of the 24 Volt d.c. supply the green Power LED will light.
The unit is calibrated as follows :-
0A load current 4mA output current
20A load current 20mA output current
PRICING
Please contact sales office on 01296 423 203 or email sales@keenelectronics.co.uk |
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E-mail: sales@keenelectronics.co.uk Phone: 01296 423203 Fax: 01296 339014
Company Registration No. 2613501 VAT Registration No. 596069885
Registered Office: 202, Aylesbury Road, Bierton, Aylesbury, HP22 5DT |
