Logic Beach offers a number of kWh sensors to monitor and record power from single to three phase electrical systems.  Each sensor uses a split core current transformer (CT) and voltage sensing leads to monitor current, voltage and phase values which are used to calculate kWh.  A pulse output cooresponds to a kWh output.  This output is counted using the General Purpose Digital Input (GPDI) in our data loggers or a xLIM-2 counter Interface Module in a ModuLogger or HyperLogger. Using a xLIM-2 Interface Module allows for more than one kWh sensor to be connected to a data logging system. In fact, the HyperLogger can be configured to a accept 25kWh sensors and the ModuLogger 21kWh sensors.

Using HyperWare a user will then write a program to record the number of pulses counted within a specific period of time.  This output can then be sent to memory for a record of power consumption over that time period.  Additionally, the flexibilty of HyperWare allows for the program to be expanded to include hourly, weekly, daily monthly and total consumption. 

Chilled water production is a typical application illustrating the use of a kWh sensor and a Logic Beach data logger. Energy consumption, kWh, can be recorded every 15 minutes as well as the inlet and outlet water temperatures and flow rate of the chilled water. BTUs are then calculated and plotted against consumption drawing an energy efficiency picture for the system.

AC Current and Power Selection Guide



AC Power - kWh Current Transformers Form Factor Single Phase
115 VAC Split-core watt hour meter, 48 to 62 Hz, self-powered, color coded wiring, any power factor,  dual color LED for load rate and power direction flow. All part numbers: O.D. 3.27x3.75x1.13.
Part number
Description
Max. Current
LBI-SWH-1100
115VAC
100 Amps
LBI-SWH-1200
115VAC
200
LBI-SWH-1400
115VAC
400
LBI-SWH-2100
208/230 VAC
100
LBI-SWH-2200
208/230 VAC
200
LBI-SWH-3100
277 VAC
100
LBI-SWH-3200
277 VAC
200

Single phase CT for kWh measurement.

AC Power Transducers - kWh Consumption, Single CT Model for BALANCED loads
Self-contained split-core transducers. 208 - 480 volts. One CT with three voltage sense leads for balanced load monitoring.  Measures: 208 - 480 VAC 3 phase, 240/120 VAC single phase, 277 VAC single phase. True RMS.  Automatic detection and compensation for phase reversal. +/- 1% full scale accuracy and field selectable pulse output.
Part number
Description
Max. Current
LBI-H8051-0100-2
Medium clamp: 1.51" x 1.25" opening
100 Amps
LBI-H8051-0300-2
Medium clamp: 1.51" x 1.25" opening
300
LBI-H8051-0400-3
Large clamp: 2.89" x 2.45" opening
400
LBI-H8051-0800-3
Large clamp: 2.89" x 2.45" opening
800
LBI-H8051-0800-4
Bus Bar: 5.5" x 2.45" opening
800
LBI-H8051-1600-4
Bus Bar: 5.5" x 2.45" opening
1600
LBI-H8051-2400-4
Bus Bar: 5.5" x 2.45" opening
2400
AC Power Transducers - kWh Consumption, Triple CT Model for UNBALANCED loads

Self-contained split-core transducers. 208 - 480 volts. Three CTs with three voltage sense leads for unbalanced load monitoring.  Measures: 208 - 480 VAC 3 phase, 240/120 VAC single phase, 277 VAC single phase. True RMS.  Automatic detection and compensation for phase reversal.  +/- 1% full scale accuracy and field selectable pulse output.
Part number
Description
Max. Current
LBI-H8053-0100-2
Medium clamp: 1.51" x 1.25" opening
100 Amps
LBI-H8053-0300-2
Medium clamp: 1.51" x 1.25" opening
300
LBI-H8053-0400-3
Large clamp: 2.89" x 2.45" opening
400
LBI-H8053-0800-3
Large clamp: 2.89" x 2.45" opening
800
LBI-H8053-0800-4
Bus Bar: 5.5" x 2.45" opening
800
LBI-H8053-1600-4
Bus Bar: 5.5" x 2.45" opening
1600
LBI-H8053-2400-4
Bus Bar: 5.5" x 2.45" opening
2400
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Logic Beach, Incorporated
8363-6F Center Drive
La Mesa, CA 91942
Phone: (619) 698-3300
Fax: (619) 469-8604