Temperature monitoring system 2456-LEM

pressurehumiditydensity

Product overview
The 2456-LEM Laboratory Environment Monitor measures barometric pressure, ambient temperature, relative humidity and air density and transmits data to a PC via RS-232 or RS-485. Supplied Windows software displays real-time values, supports data logging for one to eight LEM units and performs annual recalibration by downloading calibration coefficients to the device's non-volatile memory.

Key features

• Communications: RS-232 or RS-485 interface.
• Included software: real-time display, data logging (1, 5 or 15 minute intervals) and calibration management; output as space-delimited text for spreadsheet import.
• Measurement precision: temperature up to ±0.1 °C; pressure ±0.04 inHg (1.3 mbar); humidity ±3 %RH.
• Air density measurement for buoyancy correction in mass calibration applications.
• Compatible with Ruska piston gauge monitors, WinPrompt software and Model 2465 autofloat gas piston gauge for automated buoyancy compensation.

General specifications (table)
Units: Temperature °F or °C; Pressure mmHg, cmHg, inHg, kPa, mbar, psi, bar, kg/cm2; Humidity %RH; Air density g/cm3, kg/m3, lb/in3
Power: 10–36 V DC, 250 mA max (115/230 V AC adapter supplied). Optional power via RS-485.
Operating temperature: 18 °C to 28 °C (64 °F to 82 °F)
Storage temperature: -20 °C to 70 °C (-4 °F to 158 °F)
Humidity (operating): 5 % to 95 %RH non-condensing
Weight: 0.23 kg (0.5 lb)
Dimensions (H x W x D): 133.35 mm x 82.55 mm x 31.75 mm (5.25 in x 3.25 in x 1.25 in)
Communications: RS-232 or RS-485
Warm up time: 30 minutes
Data update: 1 second
Pressure range: 20 inHg to 34 inHg (700 mbar to 1150 mbar)
Temperature measurement range: 18 °C to 28 °C (64 °F to 82 °F)
Humidity range: 5 to 95 %RH

Technical characteristics / specifications

• Measurements: barometric pressure, ambient temperature, relative humidity, air density.
• Data logging: software supports logging for up to 8 LEMs; intervals 1, 5 or 15 minutes; space-delimited text output.
• Annual recalibration via supplied software; calibration coefficients stored in non-volatile memory.
• Optional input from external digital barometer when barometric accuracy better than 0.04 inHg (1.3 mbar) is required.
• Compatibility: Ruska 2456 piston gauge monitor, WinPrompt software and Model 2465 autofloat gas piston gauge.
• Power: 10–36 V DC, 250 mA max; AC adapter included.
• Performance: data update every second; warm-up time 30 minutes.
• Precision and annual uncertainty: Temperature ±0.1 °C (±0.5 °C/year); Pressure ±0.04 inHg (±0.08 inHg/year); Humidity ±3 %RH (±10 %RH/year).
• Software requirements: Microsoft Windows 95 or later; minimal disk and RAM requirements; supports RS-232 or RS-485; includes help and system manual.