Model L40 is a low-cost, universal
meter for 65 user-selectable analog input signal types
and ranges. These include DC voltage and current, AC RMS voltage and
current, process signals (4-20 mA, 0-10V), thermocouple (10 types,
°C or °F), RTD (6 types, °C or °F), thermistors (NTC or PTC), resistance (0-5k or 0-50k ohms), and potentiometer inputs. 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 18
to 265V, AC or DC, so that power can be 24 Vdc or AC power in any
country. The meter conforms to the popular 1/8 DIN size standard and
features four 14.2 mm (0.56") high red LED digits. The display is
user scalable for input types other than temperature.
The base L40, as shipped by Laurel, is set up so that a 400 Vac input reads 400. To change to another signal type or range, pry off the meter faceplate, push out the electronics, and place jumpers as illustrated in the manual. The jumper positions are well labeled, and the jumpers have a large, easy-to-grasp handle. Also make software selections using front panel keys. If you want Laurel or your distributor to set jumpers and do the front panel programming for you, order the FS option.
Extensive 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. Further flexibility is provided by 1 or 2 optional output boards, which can be added at any time.
An Option 1 board can plug into the display board. This can be a single 8A relay board, an isolated active or passive 4-20 mA analog output board, or an isolated Modbus compatible RS485 serial data output board.
An Option 2 board can plug into the Option 1 board if
installed. This is another single 8A relay board. For example, this board allows an L40 to have and analog
output and a relay output, or to have two relay outputs.
If only a single meter is to be stocked for a large number of applications, the low-cost L40 is your choice. While this meter does not match the high accuracy, speed and programmable features of our Laureate series, it is perfect for many panel meter applications.
| Range | Resolution | Input Resistance | Max Signal | Accuracy |
|---|---|---|---|---|
| ±60.0 mVdc | 0.1 mV | 1 MΩ | 3 Vdc | < 0.25% FS |
| ±200.0 mVdc | 0.1 mV | 10 kΩ | 30 Vdc | < 0.20% FS |
| ±2.000 Vdc | 1 mV | 100 kΩ | 100 Vdc | < 0.20% FS |
| ±20.00 Vdc | 0.01V | 1 MΩ | 150 Vdc | < 0.20% FS |
| ±200.0 Vdc | 0.1 V | 12 MΩ | 800 Vdc | < 0.20% FS |
| ±400 Vdc | 1 V | 12 MΩ | 800 Vdc | < 0.20% FS |
| ±20.00 mAdc | 0.01 mA | 4.7 Ω | 25 mAdc | < 0.15% FS |
| ±5.00 Adc | 10 mA | 20 mΩ | 7 Adc max 7 sec | < 0.25% FS |
| Range | Resolution | Input Resistance | Max Signal | Accuracy |
|---|---|---|---|---|
| 60.0 mVac | 0.1 mV | 1 MΩ | 3 Vac | < 0.3% FS |
| 200.0 mVac | 0.1 mV | 10 kΩ | 30 Vac | < 0.3% FS |
| 2.000 Vac | 1 mV | 100 kΩ | 100 Vac | < 0.3% FS |
| 20.00 Vac | 0.01V | 1 MΩ | 150 Vac | < 0.3% FS |
| 200.0 Vac | 0.1 V | 12 MΩ | 800 Vac | < 0.3% FS |
| 400 Vac | 1 V | 12 MΩ | 800 Vac | < 0.3% FS |
| 20.00 mAac | 0.01 mA | 4.7 Ω | 25 mAac | < 0.5% FS |
| 5.00 Aac | 10 mA | 20 mΩ | 7 Aac max 7 sec | < 0.5% FS |
| Range | Scaling | Input Resistance | Max Signal | Accuracy |
|---|---|---|---|---|
| 4-20 mAdc | -1999 to 9999 | 4.7 Ω | 25 mA | < 0.15% FS |
| 0-10 Vdc | -1999 to 9999 | 1 MΩ | 25 Vdc | < 0.20% FS |
| RTD Type | Range °C | Range °F | Excitation | Accuracy |
|---|---|---|---|---|
| Pt100 | -200 to 700°C | -328 to 1292°F | < 900 µA, 2 or 3-wire | < 1°C |
| Pt500 | -150 to 630°C | -238 to 1166°F | < 90 µA, 2-wire | < 1°C |
| Pt1000 | -190 to 630°C | -310 to 1166°F | < 90 µA, 2-wire | < 1°C |
| Ni100 | -60 to 180°C | -76 to 356°F | < 900 µA, 2-wire | < 1°C |
| Ni200 | -60 to 120°C | -76 to 248°F | < 900 µA, 2-wire | < 1°C |
| Ni1000 | -60 to 180°C | -76 to 356°F | < 90 µA, 2-wire | < 1°C |
| TC Type | Range °C | Range °F | Accuracy |
|---|---|---|---|
| Type K | -100 to 1350°C | -148 to 2462°F | < 3°C |
| Type J | -100 to 1200°C | -148 to 2192°F | < 3°C |
| Type E | -100 to 1000°C | -148 to 1832°F | < 3°C |
| Type N | -100 to 1300°C | -148 to 2372°F | < 3°C |
| Type L | -100 to 900°C | -148 to 1652°F | < 3°C |
| Type T | -100 to 400°C | -148 to 752°F | < 3°C |
| Type R | 0 to 1768°C | 32 to 3214°F | < 3°C |
| Type S | 0 to 1768°C | 32 to 3214°F | < 3°C |
| Type B | 700 to 1828°C | 1292 to 3322°F | < 5°C |
| Type C | 0 to 2300°C | 32 to 4172°F | < 5°C |
| R25 Values | Beta Values | Resolution | Accuracy |
|---|---|---|---|
| 1.0 to 200.0 kΩ | 2000 to 5500 | 1° or 0.1°, °C or °F | < 1.5% of resistance |
| Main Series | Range °C | Range °F | Accuracy |
|---|---|---|---|
| KTY-121 | -55 to 150°C | -67 to 302°F | < 1°C |
| KTY-210, KTY-220 | -55 to 150°C | -67 to 302°F | < 1°C |
| Range | Resolution | Bias Current | Accuracy |
|---|---|---|---|
| 0 to 5 kΩ | 1 Ω | 926 to 64 µA | < 1.5% of reading |
| 0 to 50 kΩ | 10 Ω | 86 to 20 µA | < 1.5% of reading |
| Potentiometer Range | Default Scaling | Potentiometer Resistance | Accuracy |
|---|---|---|---|
| 0 to 100% | 0 to 100.0 | 500Ω to 20 kΩ | < 0.5% of FS |
| Frequency Range | Default Resolution | Signal Level | Accuracy |
|---|---|---|---|
| 15.0 to 100.0 Hz | 0.1 Hz | Same as AC range | < 0.15% of Rdg |
| Display | |
|---|---|
| Digital readout | 4 red LED digits, 7-segment, 14.2 mm (.56") digit height, 5 brightness levels |
| Display range | -1999 to 9999 |
| Update time | 300 msec |
| Sensor break indication | Display of "h.ovr" for overrange, "h.udr" for underrange |
| Indicator lamps | 2 red LED alarm indicators |
| Power | |
| Universal voltage | 18 to 265 Vac/dc |
| Power consumption | < 1.5W meter only, < 2.5W meter with options |
| Isolation | 2500 Vrms |
| Excitation output | 5V or 15V @ 30 mA (jumper selectable) |
| Analog Output (M1 option for slot 1) | |
| Output level | 4-20 mA, active or passive (selectable at connector) |
| Maximum load | 350Ω active, 700Ω passive |
| Scaling | Zero and full scale adjustable from -1999 to +9999 counts |
| Accuracy | < 0.5% FS |
| Update time | 400 ms |
| Isolation | 1000 Vdc |
| Relay Outputs (A1 option for slot 1 or A2 option for slot 2) | |
| Relay type | Single 3-contact relay (NC, NO, common) |
| Current rating | 8A at 250 Vac |
| Isolation | 2500 Vrms |
| RS485 (S1 option for slot 1) | |
| Protocol | Modbus RTU |
| Programmable addresses | 1-247 |
| Supported function code | 4 = Read the register |
| Registers | 0 = Reading value (16 bits); 1 = number of decimals (16 bits) |
| Error codes | 0 = Function not supported; 1 = Register not accessible |
| Data rates | 9600 or 4800 baud |
| Isolation | 1000 Vdc |
| Signal Connections | |
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| Dimensions | |
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| Environmental | |
| Operating temperature | 0°C to 50°C |
| Storage temperature | -20°C to 70°C |
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