Fisher 244ER Performance, Failure Mode, Humidity Limits, Turn-on Time, Update Time, Stability

Rosemount Models 244EH and 244ER PC-Programmable Temperature Transmitters

Failure Mode

The values that the transmitter drives its output to in failure mode depend on whether it is factory configured to standard or NAMUR-compliantoperation. The values for standard and NAMUR-compliant are as follows:

TABLE A-1. Operation Parameters

	Standard	NAMUR-Compliant
Linear Output:	3.9 ≤ I ≤ 20.5 mA	3.8 ≤ I ≤ 20.5 mA
Fail High:	21 ≤ I ≤ 23 mA (default)	21 ≤ I ≤ 23 mA (default)
Fail Low:	I ≤ 3.75 mA	I ≤ 3.6 mA

Performance

Humidity Limits

0 to 99% relative humidity, non-condensing

Turn-on Time

Performance within specifications is less than 5.0 seconds after power is applied to the transmitter

Update Time

Approximately 0.5 seconds

The Models 244EH and 244ER maintain a specification conformance of at least 3s.

Stability

±0.1% of span or 0.1 °C, whichever is greater, over 12 month period

Power Supply Effect

Less than ±0.005% of span per volt

Vibration Effect

The transmitters tested to the following specifications with no effect on performance:

Frequency	Vibration
10 to 60 Hz	0.21 displacement
60 to 2000 Hz	3 g peak acceleration

CE Electromagnetic Compatibility Compliance Testing

The Models 244EH and 244ER meet all requirements listed under IEC 61326: Amendment 1, 1998.

A-2