Electricity Meters

Available in three diferent certified brands

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Also available in the following two meter brands:

View ACTOM Brand  
  View EKHWESI Brand

Holley: User Interfase Unit (UIU)

The UIU is the user prepayment user interfase, and provides a LCD to view information, and keypad to enter or request information, LED and buzzer alarm indication.

The numeric keypad has 12 keys:

Pairing UIU with the MCU (meter)

  • Insert 4 AAA 1.5V batteries into the battery compartment at the rear of the UIU to ensure operation while the load is disconnected.
  • If the display is off, depress any button to wake the UIU display
  • Key in 337597072666 on the UIU and press ↳ (accept button ) to reset the pairing. The SUCCEED message will apear on the LCD display.
  • Key in 11 digit meter number and press the ↳ (accept button ). The UIU will send the pairing command. If UIU and meter pairs successfully, UIU-good will be displayed, else Failed will be displayed.

  PDF Format: Device Specs


Please Note:

  • The UIU will exit the pairing process automatically if the meter number is not entered within 30min after pairing is reset.
  • The UIU will exit the pairing process immediately after entering the meter number, irrespective of successful pairing or not.
  • During the pairing process, short codes, recharge tokens or test tokens cannot be used.
  • The pairing process will be exited in the event of a power failure

LCD Functionality:

Segment/symbol on LCD Description
Main display for energy, tokens and instantaneous values
OBIS code
Remaining credit data indicator
UIU battery under voltage indicator
kWh, V, A, KW Composite unit
Tamper event alarm indicator
Relay open / closed indicator
Communication symbol, flashes when data exchanges underway
Reverse current indicator
Voltage detection indicator

LED Functionality:

LED Display Indicator status
Rate of consumption (Red LED)
Flashing Red LED indicates the rate of electricity consumption. A fast flash indicates high usage while a slow flash indicates low usage
Alarm/relay status/ communication (bi-colour LED)
RED: indicates relay disconnected (high priority) FLASHING RED: indicates tamper event occurred GREEN: MCU and UIU communicating
Remaining Credit Status (bi-colour LED)
GREEN: Remaining credit exceed the high credit threshold RED: Remaining credit below the high credit threshold FLASHING RED: Remaining credit below the lowlow credit threshold
FLASHING RED with BUZZER: Remaining credit below the critical credit threshold. Note: when the meter in the postpaid mode, LED is GREEN

Recharging the meter

  • After purchasing credit, the user will receive a 20 digit STS TOKEN
  • The STS TOKEN is entered into the meter using the UIU keypad
  • Entering the token, 10 seconds between inputting of consecutive digits is allowed. Exceeding this will result in the user having to restart the inputting process.
  • The back one space clear button allows errors to be corrected.
  • Once all digits have correctly being keyed in, the accept button transmits the token to the MCU meter
  • The meter configuration software can also be used to enter the token into the meter

On entry of the token, one of the following responses are received:

Display Description
Recharge successfully
Recharge credit is 132.50kWh
Recharge unsuccessful
Entered TOKEN has previously being entered
Recharge unsuccessful
Entered TOKEN code is correct but this recharge credit plus remaining credit exceeds maximum credit threshold
Recharge unsuccessful
Entered TOKEN older than the oldest TOKEN in the meter log (Overdue TOKEN)
Recharge unsuccessful
Entered TOKEN incorrectly entered
Recharge unsuccessful
The security key of the Entered TOKEN has expired

Measurement and Billing:

  • Active energy (import and export).
  • Remaining credit.
  • Instantaneous Measurement (V, I, kW, f, power factor).


  • Metering Unit:
  • - LED indicators provide visual indication for active power consumption rate, credit status, load switch status, alarms, mains power and "communication to CIU" status.
  • Customer Interface Unit (CIU):
  • - Large LCD with language independent icons.
  • - Supports 3 display modes: scrolling display, manual display and power-off display.
  • - Display contents are configurable.
  • - LED indicators provide visual indication for credit status and alarm buzzer.

Anti-Tamper Features:

  • Meter cover open.
  • Terminal cover open.
  • Energy reverse.
  • Magnetic influence.

Event Logging:

  • Time stamp and event identification are logged for:
  • - Tampering.
  • - Overvoltage and Under Voltage.
  • - Overload.
  • - Power failure.
  • - Programming.
  • - Credit related events.


  • IEC62055-31, IEC62052-11, IEC62053-21, IEC 62056-21, IEC 62056-61, IEC62055-41, IEC62055-51, IEC62055-52.
  • STS 101-1, STS 201-1.
  • Eskom standard: 240-76625601.

Accuracy Class

  • Class 1 (IEC 62053-21).


  • Rated Current Ib = 5A.
  • Max. current Imax = 80A.
  • Starting Current = 0.004Ib.


  • Reference Voltage Un = 230V.
  • Voltage Range = 0.8Un to 1.2Un.
  • MaximumWithstand Voltage = 440V (48 hrs).

Reference Frequency

  • 50Hz ∓ 2%.

RTC Control

  • Clock accuracy (23oC) = less than 0.5s / day.

Temperature Range

  • Operation =-25oC to +70oC.
  • Storage = -40oC to +85oC.
  • Humidity = up to 75%.

Insulation Tests

  • AC voltage test = 4 kV @ 50 Hz for 1 min
  • Impulse Voltage test = 6 kV @ 1.2|50 ms.

Dimensions (h x w x d)

  • 141mm x 100mm x 45mm.


  • Current circuit = =4VA.
  • Voltage circuit = =2W/10VA.

Rate Indicator

  • 1000 imp/kWh.

Communication to CIU

  • PLC - Multi frequency channels. 150m range dependant on noise environment.


  • Multi-function LCD with backlighting.


  • Electrostatic discharges (Contact discharges) = ∓8kV.
  • Electrostatic discharges(Air discharges) = ∓15kV.
  • Surge immunity test = ∓4kV.
  • Fast transient burst test = ∓4kV.
  • Electromagnetic RF fields = 10V 150kHz~80MHz.

Ingress Protection

  • IEC 60529 = IP 54.


  • 0.5kg.


  • RTC maintained for at least 2 years in case of any power failure.
Customer Interface Unit (CIU):

User Interface

  • 12 digit keypad with audio feedback.
  • Braille tactile on center "5" key to assist the visually impaired.


  • Multi-function LCD with backlighting.


  • Wall mounting.


  • 230V 50Hz AC power (Default).
  • Battery: 4xAAA batteries (to allow recharge when credit is depleted).

Ingress Protection

  • IEC 60529 = IP 52.

Dimensions (h x w x d)

  • 148mm x 82.5mm x 37.5mm.


  • 0.5 kg.

Overall Dimension

Pre-paid Options:
Purchase Prepaid

With a variety of online, mobile, ATM and EFT purchasing options, we've made it even easier for you to buy your prepaid electricity whenever and however you want to.

Replace Meter Card

If you need us to replace your pre-paid meter card, simply fill in the pdf form and e-mail it to our offices. Your request will be processed as soon as we receive your proof of payment.

Meters On Sale

Meter Prices are subject to change at any time and some meters are limited to stock on hand. If out of stock, Lead time for meter manufacturing usually takes about 6 - 8 weeks.

UIU Connection

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