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Digi-Watt General Product Description
The Digi-Watt Meter watt hour counters was designed to measure accumulated kilowatt
hours on any electrical system that has one, two or three phases, each one approximately
120 volts AC to neutral. Rather than mount in a standard meter socket, the meters were
designed to be installed in any NEMA approved electrical enclosure.  An optional mounting
plate is available for easy installation of the counter. Kit form, final assembly by installer.
Not UL rated.

Each meter consists of several components

·         An electronics module

·         One, two or three current transformers (CTs)

·         An electro-mechanical counter to display the accumulated kilowatt hours

·         Meters are available in several configurations for different types of service

·         Single 120 volt service

·         Single 240 volt service

·         Single three-phase, 208 volt service in delta, wye and wild leg (stinger) configurations

·         Single three phase, 277/480 volt service

Installation Overview

Caution
Serious injury can result from electrical shock.  Be sure to turn off the electrical
power before installing any meter. Fire can result from loose electrical connections. 
Ensure that all electrical connections are secure.  If you do not understand theses
instructions hire an experienced electrician to install the meter for you.  Help is also
available from the factory buy phone or email.  In most localities a permit and
inspection is required to install the meters.

Digi-Watt watthour counters are designed to be mounted in any type of standard electrical enclosure, a meter socket is not used.  The meter is connected to the neutral line and to each of the power lines to provide the voltage reference for the power measurement and to provide power to run the meter.  The power line carrying the current to be measured is passed through a current transformer (CT) and the CT is connected to the meter.  A 120 volt service requires one CT, a 240 volt service with neutral requires two CTs and three-phase, 208 volt service, needs three CTs.  A 240 volt service without neutral requires one CT and a three phase delta service (no neutral) requires two CTs. Connecting two wires from an electromechanical display counter completes the installation.  

Technical Specifications

All Digi-Watt models share these common specs.

Voltage Requirements:

90-140 VAC to Neutral for each element

Frequency:

50-60 Hz

Power Consumption:

2 watts

Phase:

Single phase, 2 phase, or 3 phase

Rated Load:

200 amps each element

Relay Output:

5 VDC @ 300 mA maximum

Counter Pulse

10 VDC for 40 msec, 70 msec delay between pulses

Physical size:

5" x 2.78" x 0.91"

Weight: 

4.0 oz

Temperature range:

Operating

-20 F - 160 F (-28.8 C to 71.1 C)

Storage

-40 F - 160 F (-40 C to 71.1 C)

Start up

-20 F - 160 F (-28.8 C to 71.1 C)

Humidity:

Non-condensing

Restrictions:

Must be mounted in NEMA enclosure appropriate for the location. Must be mounted in dry location. Must use current transformers provided by MetersUSA

Current Transformers are dedicated to the instrument.  Non-standard CT’s are available and must be calibrated with the unit at time of final assembly.

Specifications for Standard Model 4720/1 Current Transformers

Physical Size:

1.25" outside diameter

0.55" inside diameter

Weight:

1.25 oz

Leads:

24" long, 300 VAC insulation

Specifications for the Mechanical Display

Physical Size:

1.19" x 0.78" x 1.55" largest dimensions

1.06" x 0.56" size for mounting hole

Weight:.

3.75 oz

Mounting Plate:

0.156" max thickness for mounting plate

0.062" min thickness for mounting plate

Activation pulse

5-12VDC 40msec duration
 

Warranty The manufacture warrants its products, if used in accordance with all applicable instructions, to be free from original defects in material and workmanship for a period of five years from the date of manufacture. If the product should prove defective in material or workmanship within that period, Davidge Controls will repair or replace the product, in its sole discretion. Service under this Warranty can only be obtained by your delivering or shipping the product (with all shipping or delivery charges prepaid) to: Davidge Controls. Call MetersUSA 1(847) 302 7691 for a Return Material Authorization (RMA) before sending any equipment back for repair.

THIS WARRANTY DOES NOT APPLY TO NORMAL WEAR OR DAMAGE RESULTING FROM ACT OF GOD, ACCIDENT, MISUSE, ABUSE, OR NEGLECT.  SELLER MAKES NO EXPRESS WARRANTIES OTHER THAN THE WARRANTY EXPRESSLY SET FORTH HEREIN, EXCEPT TO THE EXTENT PROHIBITED BY APPLICABLE LAW. ALL IMPLIED WARRANTIES INCLUDING ALL WARRANTIES OF MERCHANTABILITY OR FITNESS ARE LIMITED IN DURATION TO THE WARRANTY PERIOD SET FORTH ABOVE AND THIS WARRANTY EXPRESSLY EXCLUDES ALL INCIDENTAL AND CONSEQUENTIAL DAMAGES. (Some states do not allow limitation on how long an implied warranty lasts, and some states do not allow the exclusion or limitation of incidental or consequential damages so the above limitations or exclusions may not apply to you. This Warranty gives you specific legal rights, and you may have other rights which vary from jurisdiction to jurisdiction).

Damage from lightning strikes, power surges, and improperly connecting the meter to the power source are not covered by the warranty.