100/180 MM GRAPHICS RECORDER: USER GUIDE
HA261742
Issue 16 Nov 04
User Guide
Page 62
4.3.3 CHANNEL/ALARM CONFIGURATION (Cont.)
Example: A type J thermocouple is used to measure a temperature range of 100 to 200 degrees Celsius. This thermo-
couple output is transmitted to the recorder by a 4 to 20 mA transmitter, for display as an efficiency value between 0
and 100%. In such a case, the following values would be set up:
Input type = milliamp
Input range low = 4.0
Input range high = 20.0
Scale low = 0.0
Scale high = 100
Scale units = %
Linearisation range low = 100
Linearisation range high = 200
Linearisation type units = degrees C
Linearisation type = Type J thermocouple.
Input shunt value = 250 ohms
Note: The following description shows all possible fields. The recorder itself edits the list and shows only
those fields appropriate to the setup so far. For example, the 'Shunt' field appears only for mA input type.
CHANNEL NUMBER
The current channel and its descriptor are displayed. Touching the window area allows another channel to be selected
for configuration.
VALUE
Shows the current value of the channel, together with either 'Unadjusted' or the date and time of channel adjustment.
INPUT TYPE
Select thermocouple, millivolt, Volt, milliamp, RTD, Ohms, Digital (not channel 1, 7 etc.), Slave Comms, Test or
Master Comms as input type. Slave Comms must be selected if the channel is to be written-to via Modbus. Master
Comms must be selected if this channel is to read from another instrument. For details of Master Comms see section
3 of the Communications Manual.
LIN TYPE
The following linearisation tables are available as standard:
Linear, square root, x
3/2
, x
5/2
, UserLin1, UserLin2, UserLin3, UserLin4 (see
Thermocouple types B, C, D, E, G2, J, K, L, N, R, S, T, U, NiMo/NiCo, Platinel, Ni/NiMo, Pt20%Rh/Pt40%Rh
Resistance thermometer (RTD) types Cu10, Pt
100
, Pt
100
A, JPT
100
, Pt
1000
, Ni
100
, Ni
120
, Cu
53
.
For input ranges, accuracies etc. associated with the above thermocouple/RTD tables, see Annex A.
INPUT LOW
Enter the lowest value to be applied to the input terminals (e.g.4.00).
INPUT HIGH
Enter the highest value to be applied across the input terminals (e.g. 20.00).
SHUNT
Allows a shunt resistor value to be entered for input type = mA. Commonly used values are 100 ohms and 250 ohms.
Note that shunt resistors are connected to the input connector. The recorder cannot detect whether a shunt is fitted, or
if one is, what value it has. Therefore it is the responsibility of the user to ensure that the ohmic value of any shunt
fitted matches the shunt value entered in this field.
