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CURS100 100 Ohm Current Shunt Terminal Input Module - Page 1
CURS100 100 Ohm Current Shunt Terminal Input Module
Revision: 7/13
Copyright © 1996-2013 Campbell Scientific, Inc.
CURS100 100 Ohm Current Shunt Terminal Input Module - Page 3
... is limited to the limits extended by Campbell Scientific, Inc. ("Campbell") to be the sole and exclusive remedy under this warranty is not liable for installation services performed by surface carrier prepaid within the continental United States of all other consumables have been subjected to products manufactured by Campbell, and product specific training, is in materials and...
CURS100 100 Ohm Current Shunt Terminal Input Module - Page 4
... form is incomplete, the product will be either emailed to repair@campbellsci.com or faxed to refuse service on the outside of product receipt or is available from our web site at the customer's expense. Campbell Scientific reserves the right to (435) 227-9106.
Campbell Scientific is not received within their territories. Please visit www.campbellsci...
CURS100 100 Ohm Current Shunt Terminal Input Module - Page 5
... Wiring 4
4.1 Two-Wire Transducers 4 4.1.1 Possible Ground Loop Problems 5 4.1.2 Minimum Supply Voltage 5
4.2 Three-Wire Transducers 6 4.3 Four-Wire Transducers 7
5. CURS100 schematic 2 3-1. Specifications 1
3. Sensor and Programming Example 8
5.1 Voltage Range 8 5.2 Calculating Multiplier and Offset-An Example 8 5.3 CR1000 Program Example 9 5.4 CR9000(X) Program Example 10 5.5 CR10...
CURS100 100 Ohm Current Shunt Terminal Input Module - Page 7
...that is measured by the datalogger. FIGURE 1-1. The CURS100 converts a current signal (for resistive bridge measurements, voltage dividers, and precision current shunts.
Specifications
100 Ohm Shunt Resistor
Tolerance @ 25°C:
&#... CR850, CR1000, CR3000, CR5000, CR9000X, CR9000, 21X, CR23X). CURS100 terminal input module
2. CURS100 100 Ohm Current Shunt Terminal Input Module
1.
CURS100 100 Ohm Current Shunt Terminal Input Module - Page 8
...into a current signal. An advantage of three parts: a sensor, a current transducer (quite often... high, low, and ground terminals ( on 21X, CR23X, CR800, CR850, CR1000, CR3000, CR5000, or CR9000(X) or AG on CR10(X)).
3. First, most ... output transducers is measured by the signal current (I (R).
CURS100 schematic
The CURS100 has three pins: high, low, and ground; The sensor...
CURS100 100 Ohm Current Shunt Terminal Input Module - Page 9
Use Instruction 2 for Edlog dataloggers (for example, CR1000, CR5000, or CR9000(X)). The differential voltage measurement measures the difference in the CURS100 is not connected ... to datalogger ground, which could induce undesirable offset errors in order for the CR800, CR850, CR1000, CR3000, CR5000, and CR9000(X) dataloggers.
3 The CURS100 connects the resistor between the high and the low...
CURS100 100 Ohm Current Shunt Terminal Input Module - Page 10
... Sensor Power
FIGURE 3-1. CURS100 L terminal connected to a datalogger G terminal using a jumper wire. Transducer Wiring
Current transducers differ mainly in how they are grouped by the total number of wires the transducer uses to the adjacent ground ( or G) terminal on the datalogger signal ground, which could induce undesirable offset errors in the relative...
CURS100 100 Ohm Current Shunt Terminal Input Module - Page 11
... the resistor; If such a sensor is connected to the datalogger earth ground.
CURS100 100 Ohm Current Shunt Terminal Input Module
Datalogger
H I
L G +12 V...I
Power
-
+
Battery
FIGURE 4-2. 2-wire with external power
4.1.1 Possible Ground Loop Problems
The resistor must be too low.
4.1.2 Minimum Supply Voltage
When the power supply is...ground-loop error may occur if the signal output is not...
CURS100 100 Ohm Current Shunt Terminal Input Module - Page 12
...However, if the battery voltage drops to power ground. The voltage of the transducer may be in error. Datalogger ground is the voltage applied to the transducer. Datalogger
H I
(Max)
L
Transducer
Signal... the sensor must pass through the resistor before going to the transducer.
CURS100 100 Ohm Current Shunt Terminal Input Module
transducer and everything is fine. H
2 ...
CURS100 100 Ohm Current Shunt Terminal Input Module - Page 13
Some transducers have completely isolated outputs. CURS100 100 Ohm Current Shunt Terminal Input Module
Datalogger H
L G
Transducer
Signal
I
-
+
Battery
Transducer Signal
Signal Return Ground Power
FIGURE 4-7. 4-wire with external power
4.3 Four-Wire Transducers
A ...
CURS100 100 Ohm Current Shunt Terminal Input Module - Page 14
...V, is :
V = I . V = 100 I
The maximum voltage occurs at 20 mA.
CURS100 100 Ohm Current Shunt Terminal Input Module
5. Sensor and Programming Example
In this example, the input voltage ...measurement should be the smallest range that detects pressure where the sensor specifications are calculated for the CR1000, CR9000(X), CR10(X), and 21X dataloggers; programming for the CR800, CR850...
CURS100 100 Ohm Current Shunt Terminal Input Module - Page 15
...CR1000 program example for sensor with 4-20mA output.
'Assuming a flow meter that is the slope of the line (or multiplier).
700 psi − 200 psi
psi
m=
= 0.3125
2000mV − 400mV
mV
Now replace....
The 'multiplier to convert mV to determine the intercept (or offset). CURS100 100 Ohm Current Shunt Terminal Input Module
and at 700 psi is:
V...instruction is 400mV * .0625 = -25.0.
CURS100 100 Ohm Current Shunt Terminal Input Module - Page 16
CURS100 100 Ohm Current Shunt Terminal Input Module
BeginProg Scan (1,Sec,1,0)
'Generic 4-20 mA Input measurement Measure: VoltDiff (Measure,1,mV2500,1,True,0,_60Hz,0.0625,-25.0) CallTable (Hourly) ...
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