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Precision Thermometers

F252 Precision Thermometer

Features
		Accuracy: ±0.01°C; up to ±0.02°C with probe
		4 wire AC bridge for stability without recalibrating
		User selectable resolution of up to 0.001°C or 0.0001 ohms over full range
		Range: -200°C to +962°C depending on probe
		2 channels as standard with optional 4 or 6 channels expandable up to an additional 64 channels with Switchboxes

Typical Applications
		Site Standard
		Environmental Chambers
		Research
		Viscometry
		Multi-channel logging

F252 Brochure (PDF, approx 168KB)

For more information about this product contact ASL

ASL's F252 provides high accuracy, dual channel temperature measurement with Platinum Resistance Thermometers - PRTs - and uses AC bridge technology as developed by ASL for Standards Laboratories throughout the world. Model F252 requires no regular recalibration, the AC circuit techniques eliminating thermal EMFs and drift, while providing excellent long term stability. Front panel data entry allows you to enter probe calibration data into the F252's memory, so that thermometer resistance can be accurately converted to temperature in °C, °F or K. This can be password protected to prohibit unauthorised or accidental data entry. The combination of proven technology and sophisticated microprocessor control gives you a reliable, easy to use precision instrument.

Using F252 with SB252 Switchbox

The 8 or 16 channel SB252 switchbox complements the F252 in appearance and performance. Adding no extra system errors you can use one to four switchboxes connected to an expansion port on the rear of the F252, with either manual switching from the keypad or under interface control. With the addition of four 16 channels SB252's this can provide 64 additional channels to the F252. This turns the F252/SB252 into a powerful logging system when used with ASL's U-LOG data logging software.

F252 Precision Thermometer Features

See the table below for a run-down of this product's features and capabilities.

Range	-200°C to +962°C, depending on PRT used
Accuracy	F252 only:	±0.005°C (±5mK) at 0°C, otherwise <±0.01°C (±10mK)
	F252 + T100-250:	±25mK (-50°C to +250°C)
	F252 + T100-450:	-70°C (±45mK), -40°C to +250°C (±25mK),+250°C to +450°C (±100mK)
	F252 + T100-650:	-189°C to 420°C (±20mK), +420°C to +550°C (±35mK)
Resolution	0.001°C /°F /K (user selectable)	0.0001ohms (user selectable)
Repeatability	±2 least significant digits (±0.002°C), included in accuracy
Stability	Long term: typically <0.002ohms per year (<0.005°C for Pt100)
Temperature co-efficient	<±0.0005°C/°C ambient change. Operating ambient: 15°C to 35°C (15°C to 25°C for best accuracy). 10-90% Rh non-condensing
Data entry format	ITS90 coefficients, Callender van Dusan coefficients or EN60751 for un-calibrated probes
Probe Current	1 mA constant current source
Probe Types	1 mA constant current source
Thermometer input connectors	Front panel:	2 x 5 pin industrial DIN socket
Thermometer input connectors	Rear panel:	Optional 2 or 4 x 5 pin industrial DIN socket
Communications	USB (standard)	Optional RS232C or IEEE-488 or LAN Ethernet

For more information about this product contact ASL

2 Gatton Park Business Centre
Wells Place
Redhill, Surrey
RH1 3LG