WV448 Signal Conditioner

Bridge Input Isolating Signal Conditioner – WV448

Product Description

WV448 Signal Conditioner

WV448 Signal Conditioner

The Ultra SlimPak II is an exciting new line of isolating signal conditioners from Action Instruments with greater accuracy and better stability than virtually any other signal conditioners on the market today. The Ultra SlimPak II features Smart Power, which eliminates wasted power for low loop resistance loads in the current output mode.

The WV448 is a bridge input signal conditioner supporting three-wire input full scale ranges of ±5mV to ±200mV, (default is ±50mV). The switch selectable output ranges are 0-10VDC, 0-20mA and 4-20mA. All the input and output ranges are fully adjustable via pushbutton calibration. The default output range is 4-20mA.

Smart Power

The Ultra SlimPak II uses Smart Power to control its output supply. Smart Power automatically adjusts the the voltage to drive the output loop to the required current. A low impedance current loop will subsequently require less voltage than a loop with higher impedance. Previous designs provided only a single supply at the highest voltage required to drive the highest impedance load. Using Smart Power results in power savings and reduces the operating temperature of the signal conditioner.

Enhanced LED Diagnostics

Other than when executing the pushbutton calibration routine, the LEDs blink under the following conditions:


  • Flashes at 2Hz when the input is under range.
  • Flashes at 8Hz when the input is over range.



  • Flashes at 2Hz when the output is under range.
  • Flashes at 8Hz when the output is over range.

An Under Range condition exists when the signal is lower than the operational low value minus 6.25% of the operational span. An Over Range condition exists when the signal is higher than the operational high value plus 6.25% of the operational span.

A voltage output short circuit may cause an under range condition (RED blinking at 2Hz rate). A current output open circuit may cause an over range condition (RED blinking at an 8Hz rate).

There could be two or more LEDs blinking at the same time, which means the module has more than one error condition. Only when all error conditions have been removed, will the LEDs be back to normal (Green ON, Red and Yellow Off).

Configuring Modules

Unless otherwise specified, the factory presets the Model WV448 as follows:


Input: 0-30mV (using ±50mV range)
Excitation: 10V
Output: Current
Range: 4-20mA
Remote Cal: Off


  1. For other ranges, refer to the SWITCH SETTINGS table. Reconfigure switch S1 for the desired input type and range.
  2. Set position 1 of S1 to ON if a WVC16 will be utilized and remote calibration capability is desired.
  3. Set position 2 and 3 of S1 for the desired output type.
  4. Set positions 4-6 of S1 for the desired input range.


It is also possible to remotely select the setpoints using an Ethernet connection and the optional WVC16 WebView Communications Interface module.


When used with the optional WVC16 communications module, the WV448 supports up to 3 alarms, which can be configured as high limit, low limit and a timer for routine maintenance.

WV16 Communications Interface (Optional)

The WVC16 Communications Interface adds functionality never before found in a signal conditioning system. The WVC16 interfaces with Ultra SlimPak II devices via an internal infrared communications link (no programming required) and provides the ability to connect as many as 32 modules to the intranet, allowing the user to view process data on a near real time basis, perform data logging functions on specified modules, calibrate the signal conditioners remotely, and view diagnostic information.

TThe WVC16 contains a web page server and an e-mail server. Browsers supported include Internet Explorer 5 or later and Netscape Navigator 4.7 or later. The user has the ability to have setpoint trip conditions generate an email message for up to 10 recipients. The module also contains a countdown timer that can be used to notify when routine maintenance is required, such as re-calibration. The internal temperature of the module can also be monitored. All memory to support the signal conditioner’s historical data, storage of the web pages and all e-mail messages is contained in the WVC16.

The WVC16 downloads a JAVA applet to the client’s computer. The applet provides access to the signal conditioner’s data, which includes the following:

  • Module configuration summary
  • Module configuration editing
  • Diagnostic/warning status
  • Alarm setup & status
  • E-mail setup, editing & address book
  • Process variable viewing

The calibration procedure is contained in the Installation & Calibration Instructions document, which is available on our website (www.actionio.com). You can also obtain it by telephoning Action technical support (703- 669-1318).

Note that Custom Calibration (option C620) is available from the factory (settings MUST be within the units specifications). For a C620, specify the following:

  1. a) Input Range.
  2. b) Output Type, Range & Units (mA, V).
  3. c) Excitation Voltage.



Full Scale Range

± 5mV, ± 10mV, ± 20mV, ± 50mV, ± 100mV, ± 200mV



1M ohms



400Vrms (intermittent); 264Vrms (continuous)


Direct or reverse acting


Bridge Excitation

1 to 10VDC, 120mA


Input Accuracy

0.015% of span


Pushbutton Adjustment

  • Effective zero offset: >95%
  • Effective span turn down: >95%
    • (Inputs <10mV)
  • Effective zero offset: >50%
  • Effective span turn down: >50%
    • (Inputs <10mV)


Local Range Selection

By DIP switch


Output Voltage

  • 0 to 10V (pushbutton adjust. to 75% of range)
  • Source Impedance: <10 ohms






  • 0 to 20mA (pushbutton adjust. to 75% of range)
  • (4mA min position available on range switch)
  • Source Impedance: >100k ohms




Output Accuracy

0.05% of Full Scale


Overall Accuracy

0.065% of Full Scale


Output Ripple

0.03% rms


Response Time

150 mSec, 10 to 90%






120dB @ DC, >90dB @ 60Hz, or better



1800VDC or peak AC between input, output & power.



DIN rail case – refer to Dimensions drawing


Operating Temperature

0°C to +60°C (32°F to 140°F)


Storage Temperature

-25°C to +85°C (-13°F to 185°F)


Operating Relative Humidity

15% to 95% RH (non-condensing) at 45°C


Non-operating Relative Humidity

90% RH (non-condensing) at 60°C for 24 hours



  • 9 to 30VDC, 1.5W typ, 3.5W max.


Agency Approvals (EMC & Safety)

  • CE, EN61326, EN61010-1 CSA & UL Combined mark
Ordering Information
1. Specify: Model: WV448-2000
2. Optional Custom Factory Calibration (specify C620, see required settings under “Calibration”)
3. Accessories.

All WV Series modules will mount on standard TS35 (model MD03) DIN rail. In addition, the following accessories are available:

WVC16 Communications Interface
MD03 TS35 x 7.5 DIN Rail (2 meters)
WV905 24VDC Power Supply (0.5 Amp)
H910 24VDC Power Supply (1 Amp)
H915 24VDC Power Supply (2.3 Amp)
MB03 End Bracket for MD03
C650 Utility software for WVC16