E126-P-EL
User Manual
FW_E126-P-EL_M_v0301-01_EN
Page 27
5.5.5
MENU 5: TEMPERATURE - WITH TYPE TP (PT100)
5
TEMPERATURE - WITH TYPE TP (PT100)
5.1 DISPLAY
Sets the temperature unit for the operator. This setting does not influence
the actual calculations.
5.2 NO. OF WIRES
Sets the number of wires for the PT100 sensors.
5.3 FILTER
Stabilizes the temperature reading. This digital filter setting produces a
more stable but less actual reading.
The filter principal is based on three input values: the filter level (01-99), the
last calculated temperature, and the last average value. The higher the filter
level, the longer the response time of a changed value. Use trial and error
to find the best setting for your application.
RESPONSE TIME ON STEP CHANGE OF INPUT VALUE (IN % OF END VALUE)
Filter value
50%
75%
90%
99%
01
filter disabled
filter disabled
filter disabled
filter disabled
10
7 sec
14 sec
22 sec
44 sec
20
14 sec
28 sec
45 sec
90 sec
30
21 sec
41 sec
68 sec
136 sec
50
35 sec
69 sec
114 sec
228 sec
75
52 sec
104 sec
172 sec
344 sec
99
69 sec
137 sec
227 sec
454 sec
5.5.6
MENU 5: TEMPERATURE - WITH TYPE TA (4-20MA)
A “fixed” line temperature value can be used for the calculations. This feature requires the Type TA:
4-20mA input.
Enter the fixed line temperature for offset (
5.3: TEMPERATURE - WITH TYPE TA (4-20MA) > OFFSET
) and set
span to zero (
5.2: TEMPERATURE - WITH TYPE TA (4-20MA) > SPAN
).
When no temperature sensor is connected, calibrate the low input value manually
(
5.5: TEMPERATURE - WITH TYPE TA (4-20MA) > CALIB-LOW
) to remove the range error alarm.
5
TEMPERATURE - WITH TYPE TA (4-20MA)
5.1 DISPLAY
Programs the displayed temperature unit. This setting does not influence
the actual calculations.
5.2 SPAN
Determines the measurement range in Kelvin (K) of the (0)4-20 mA
temperature sensor.
Example: Calculating the span for temperature
.
The sensor generates:
●
the minimum signal (4 mA) at a temperature of - 100°C (173.15 K).
●
the maximum signal (20 mA) at a temperature of 250°C (523.15 K).
Therefore, the span should be set at (523.15 – 173.15 =) 350 K.
After pressing PROG, the decimal point will start to flash. The decimal
position can then be changed by pressing the SELECT-key, then press the
CLEAR key to set the digits.
5.3 OFFSET
Calculations are based on temperature values in Kelvin (K).
The flow computer needs to know the measured temperature at minimum
signal. In the above example 173.15 K must be entered.
