Specifications

Input specifications

Standard inputs, (normal mode, reversing1)

 Sensor temperature coefficient Input
range
Excitation
current
Display
resolution
Measurement
resolution
Electronic
accuracy
(at 25 °C)
Measurement temperature coefficient
Diode
Negative  0 V to 7.5 V 10 µA ±0.05%100 µV20 µV±320 µV ±0.01% of rdg(20 µV + 0.0015% of rdg)/°C1
PTC RTD
1 mA
Positive0 Ω to 1 kΩ1 mA10 mΩ20 mΩ±0.04 Ω ±0.02% of rdg(1 mΩ + 0.0015% of rdg)/°C1
NTC RTD
10 mV
Negative0 Ω to 10 Ω1 mA0.1 mΩ0.1 mΩ + 0.002% of rdg±0.002 Ω ±0.06% of rdg(0.1 mΩ + 0.0015% of rdg)/°C1
0 Ω to 30 Ω300 µA0.1 mΩ0.3 mΩ + 0.002% of rdg±0.002 Ω ±0.06% of rdg(0.1 mΩ + 0.0015% of rdg)/°C1
0 Ω to 100 Ω100 µA1 mΩ1 mΩ + 0.002% of rdg±0.01 Ω ±0.04% of rdg(0.1 mΩ + 0.0015% of rdg)/°C1
0 Ω to 300 Ω30 µA1 mΩ3 mΩ + 0.002% of rdg±0.01 Ω ±0.04% of rdg(0.3 mΩ + 0.0015% of rdg)/°C1
0 Ω to 1 kΩ10 µA10 mΩ10 mΩ + 0.002% of rdg±0.01 Ω ±0.04% of rdg(1 mΩ + 0.0015% of rdg)/°C1
0 Ω to 3 kΩ3 µA10 mΩ30 mΩ + 0.002% of rdg±0.01 Ω ±0.04% of rdg(3 mΩ + 0.0015% of rdg)/°C1
0 Ω to 10 kΩ1 µA100 mΩ100 mΩ + 0.002% of rdg±1.0 Ω ±0.04% of rdg(10 mΩ + 0.0015% of rdg)/°C1
0 Ω to 30 kΩ300 nA100 mΩ300 mΩ + 0.002% of rdg±2.0 Ω ±0.04% of rdg(30 mΩ + 0.0015% of rdg)/°C1
0 Ω to 100 kΩ100 nA1 Ω1 Ω + 0.002% of rdg±10.0 Ω ±0.04% of rdg(100 mΩ + 0.0015% of rdg)/°C1

1 Current reversal used only for resitive ranges

2 Rated temperature coefficient from 15 °C to 35 °C, reduced accuracy from -20 °C to 50 °C

Sensor Input Configuration

 RTDDiode
Measurement type 4-lead differential4-lead differential
ExcitationConstant current with current reversal10 μA constant current
Supported sensorsCernox®, platinum, germanium, carbon-glass, rhodium-iron, and Rox™Silicon, GaAlAs
Standard curves suppliedLSCI PT-100,
IEC PT-100,
IEC PT-1000
LSCI DT-670
LSCI DT-470
Input connector5-pin terminal plug5-pin terminal plug

Thermometry

Number of inputs2 (Model 240-2P)
8 (Model 240-8P)
IsolationSensor inputs isolated from other circuits but not each other
Input accuracySensor dependent, refer to Input Specifications table
Measurement resolutionSensor dependent, refer to Input Specifications table

Measurement speed

 240-2P240-8P
Normal mode  
Update rate10 rdg/s12.5 rdg/s1,2
Filter100 ms100 ms
High speed mode  
Update rate10 to 1000 rdg/sN/A
Filter1 to 100 ms3N/A

1 Update rate is halved when an input is on the 100 kΩ range with current reversal enabled

2 All inputs enabled

3 Filter settings are tied to the update rate, (filter = 1000/update rate)

Temperature conversionLake Shore calibration curves (linear interpolation)
User curvesEach input has storage for one 200-point curve
Reporting unitsK, °C, °F, V, Ω

Digital I/O - Profibus

ProtocolDP-V0
Baud rates9.6 k, 19.2 k, 45.45 k, 93.75 k, 187.5 k, 500 k, 1.5 M, 3 M, 6 M, 12 M (auto baud-rate detect)
Identification number0x0F84
Reading data formatSingle precision float (32-bit)
Reading rateMatches update rate of the instrument

Digital I/O - USB

FunctionEmulates a standard RS-232 serial port
Baud rate115,200, 8 data bits, 1 stop bit, no parity, no handshaking
ConnectorUSB micro-B
Reading rateMatches update rate of the instrument

Management

Module configurationModule configured over USB interface
Configuration softwareMeasureLINK™ (free download, supported on Windows 7, 8, and 10)
Firmware updateFirmware updated over USB port

Display

Display128 × 32 pixel OLED
Display unitsK, °C, °F, V, Ω
Display update rate2 rdg/s


 240-2P240-8P
Displayed readings22
Readings cyclingFixed (no cycling)3 second hold per pair


Temperature display resolution0.0001° from 0° to 9.9999°,
0.001° from 10° to 99.999°,
0.01° from 100° to 999.99°,
0.1° above 1000°
Sensor units display resolutionSensor dependent, to 5 digits
LED annunciatorsModule status and communication status

Power supply

ConnectionScrew terminal
Voltage requirement24 VDC, ±10%
Current requirement100 mA per connected module
Power distributionMaximum 20 units connected through the DIN rail backplane connector (power supply must be able to source required current)
Internal protectionOver-voltage, under-voltage, and reverse polarity protection

Physical

Case materialPolyamide
Mounting35 mm DIN rail (EN 50022)
Water ingressIP20: not protected against harmful ingress of water
Case inflammabilityClass V0 according to UL 94
Sensor connector wire size16 to 28 AWG
Power connector wire size12 to 24 AWG
Size22.5 mm W × 115 mm H × 100 mm L (240-2P)
90 mm W × 115 mm H × 100 mm L (240-8P)
Weight120 g (240-2P)
300 g (240-8P)

Enviromental

ComplianceRoHS; CE
Operating temperature15 °C to 35 °C at rated accuracy, -20 °C to 50 °C at reduced accuracy
Storage temperature-40 °C to 85 °C
Relative humidity0 to 70% at rated accuracy, reduced accuracy up to 95%, non-condensing