- 4 -
3. PRODUCT INTRODUCTION
Model L40 is a low-cost, universal analog input meter which offers 65 user-selectable analog
input types and ranges. User-selectable input types are DC voltage and current, true AC RMS
voltage and current, process signals (4-20 mA, 0-10V), thermocouple (10 types, °C or °F),
RTD (6 types, °C or °F), NTC and PTC thermistors, resistance (0-10k or 0-100k ohms), and a
potentiometric input. The same meter handles all of these signal types with no need for a plug-
in signal conditioner board. The meter's universal power supply accepts voltages from 18V to
265V, AC or DC, so that power can be from AC in any country or from 24 Vdc. A non-isolated
excitation output of 15V, 30 mA or 5V, 20 mA can be brought out. The meter conforms to the
popular 1/8 DIN size standard and features four 14.2 mm (0.56") red LED digits. The display is
user scalable for all input types other than temperature.
The base L40, as shipped by Flex-Core, is set up so that a 0-400 Vac input reads 0-400. o
change that default range, pry off the meter faceplate, push out the electronics, and move one
or two jumpers depending on the range, as explained in this manual. Make software selections
using front panel keys after reassembling the meter.
Selectable software features add flexibility to this low cost meter. Programmable features
include five levels of display brightness, min and max capture, dual scaling selectable by an
external control input, a deadband around 0 for AC measurements, a moving average digital
filter, a "count by" function, hysteresis for alarm operation, a user-configurable fast access
menu, and selectable password protection.
Optional output boards can be plugged in at any time and provide additional flexibility:
•A first option slot accepts one of three available plug-in boards. These are a single 8A
relay board, an isolated active or passive 4-20 mA analog output board, and an isolated
Modbus RTU compatible RS485 serial data output board.
•A second option slot accepts an 8A relay board, which plugs into a first slot option
board if installed. For example, this allows an L40 to have and analog output and a relay
output, or to have two relay outputs.
Advanced standard features include:
•Front panel UP key configurable for fast access to alarm setpoints.
•Eco mode to reduce power consumption.
•Simplified scaling configuration.
•External contact closure control input with programmable function.
•Five user-selectable display brightness levels.
