Specifications

(*) Total and time-period energies, daily and night gas.
Powerful variable analysis and great communication capabilities: this is the strength of WM4 96 and PQT 90
The 3 interfacing methods of WM4 96 and PQT 90 with the official watt-hour meter are:
• Direct measurement for the power quality analysis (LV or MV/HV connection).
• Indirect energy and power measurements by means of official Watt-hour meters
(LV or MV/HV connection).
• Direct measurements of the instantaneous variables (LV connection) and indirect
measurements of the energy variables (LV or MV/HV connection).
• Energies-water-gas and instantaneous variables readable on the display of any GSM mobile
phone giving maximum control freedom, saving time and money.
• Alarms transmitted as soon as they occur via GSM or analogue modem notifying the plant
abnormal conditions.
• Data logging and stamping of up to 8 programmable instantaneous variables for a time duration
up to 90 weeks with date and time references to build up the history of the electrical installation.
• Wm4Soft Network/PqtSoft Network communication software to download, manually or
automatically (via RS485-analogue modem-GSM modem), up to 2Mb data stored in
WM4 96 or PQT 90. This information can be simply plotted in an Excel spreadsheet.
• Continuous data stamping and communication: RS232, RS485, modem, GSM, or Ethernet/Internet
port (for web-server module).
• Powerful data acquisition by means of Wm4Soft or PQT 90 and mobile phones wherever you are.
Mains quality analysis because
the harmonics are cause of
load failures and production
stop.
Load profile display with
alarms to keep the energy con-
sumption and power cost
under full control.
33
Main variables
Variables that can be monitored and displayed (Displayed only by WM4 96)
System
Average
(dmd)
Min
RS485
Analogue Out
PQT 90 Only
V
LL
,V
LN
V asymmetry
A
An
Hz
VA
var
W
PF
+kWh (*)
-kWh (*)
+kvarh (*)
-kvarh (*)
GAS (*)
H
2O
THD (A-V)
THD even (A-V)
THD odd (A-V)
Single harmonic
Single ph Max Alarm Out Pulse