4-20mA Loop Meter with Programmable Backlighting ORDERING INFORMATION Standard Instrument (panel meter, fixing kit, data sheet) FEATURES • 19mm (0.75”) digit height • Dual colour backlight with programmable status indication • Open collector outputs that mirror the backlight status (with inverted output option) • 5V supply voltage • 4–20mA measurement range The DPM 942-FPSI is a 3 ½ digit LCD current loop meter that can also be used for dual colour go-stop status indication. This functionality is ideal for simplifying monitoring applications, where an operator needs to know the status of the equipment at a glance. During standard operation the backlight is green, however if the reading goes beyond the user programmable thresholds, the display will turn red. Three open collector outputs are included, that indicate high, ok and low conditions. Both the backlight colour and outputs can be inverted. Module setup is a simple operation using an eight-way DIP switch and two push buttons. No special tools or equipment are required. SPECIFICATIONS Maximum Accuracy (overall error) Sample rate Hysteresis (high and low thresholds) 0 (32) Operating temperature range Supply voltage Supply current (not including backlight) Backlight voltage Backlight current www.lascarelectronics.com Specifications liable to change without prior warning

4-20mA Loop Meter with Programmable Backlighting PIN FUNCTIONS 1. I- Negative current loop input Positive current loop input Negative supply connection Positive supply connection Positive backlight connection Open collector alarm output. Goes low when the high threshold of the module has been passed. Open collector alarm output. Goes low when the module is measuring a signal between the high and low thresholds. Open collector alarm output. Goes low when the lower threshold of the module has been passed. Negative switch input for flashing backlight acknowledgement. Positive switch input for flashing...

4-20mA Loop Meter with Programmable Backlighting DIP SWITCH CONFIGURATION 1. Enter decimal place setup mode Invert alarm operation Invert outputs Enter low threshold setup mode Enter high threshold setup mode Enter span calibration mode Enter offset calibration mode Select backlight supply OFFSET AND SPAN CALIBRATION Calibration is performed in two steps. The first step is to adjust the offset value. The second is to adjust the span. To adjust the offset, move DIP 1 to the ‘on’ position and input a known constant current (typically 4mA). By default, 000 will be displayed. The user can then use...

4-20mA Loop Meter with Programmable Backlighting High threshold: Default threshold off. Display shows OFF Press ‘down’ button once to show 1999 Press button once for each digit of change (down to reduce value, up to increase value) Press ‘up’ button once to show -1999 Press ‘down’ button once to enable overrange. Display shows OL Press button once for each digit of change (down to reduce value, up to increase value) Default threshold off. Display shows OFF Press ‘up’ button once to enable underrange. Display shows UL When the DIP switches are returned to the ‘on’ positions the display shows the...

4-20mA Loop Meter with Programmable Backlighting FACTORY RESET Module calibration can be reset to the factory default by moving all 8 dip switches to ‘on’ and powering up the unit. The LCD will display 4 dashes when the reset is complete. Moving all the dip switches back to the ‘off’ position will return the module to the operating mode. SAFETY To comply with the Low Voltage Directive (LVD 93/68/EEC), input voltages to the module’s pins must not exceeD 60V d.c. If voltages to the measuring inputs do exceed 60V d.c., then fit scaling resistors externally to the module. The user must ensure that...