Rosemount Models 244EH and 244ER PC-Programmable Temperature Transmitters
A-2
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-compliant
operation. The values for standard and
NAMUR-compliant are as follows:
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
Performance
The Models 244EH and 244ER maintain a specification conformance of
at least 3
s
.
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:
CE Electromagnetic Compatibility Compliance Testing
The Models 244EH and 244ER meet all requirements listed under IEC
61326: Amendment 1, 1998.
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
Frequency
Vibration
10 to 60 Hz
0.21 displacement
60 to 2000 Hz
3 g peak acceleration
