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SmartReader Data Loggers
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from the high. A thermocouple transmitter, for example, with a range of -20°C to 600°C
will have an input span of 620° (600-(-20)). A pressure transducer with a range of 0 to
100 psi will have an input span of 100 psi.
6. To calculate S, measured in the same units as the input span (I) above, use this
equation:
S = R * I / 100
For example, a 4 to 20mA Relative Humidity transmitter with an input span (I) of 90% RH
and a calculated resolution (R) of 0.6% will record data in steps of 0.54% RH.
1.9.4 Customizing Input Ranges
The standard input ranges on the SmartReader 7 should be suitable for most process signal
applications, but occasionally you may require measurement of non-standard input levels
where resolution is a primary concern (see Choosing Input Channels). Ranges can be
adapted easily by using either one or two external resistors. TrendReader software has
Equation functions that can be used to scale the data to the new input levels.
The resistor value that you will require to modify each SmartReader 7 input channel is
selected by inserting your special input requirements into a simple equation. The following
sections detail these equations and the method of tying in these resistors.
10 Volt Channel
The 10 volt channel can be modified to span higher ranges (greater than 10 volts DC) by
adding a single resistor to the "10V" terminal shown in Figure 7-4. The value of the resistor
(R) can be calculated by the following formula below, based on the desired voltage input range
(Ein):
R = 4,090 x Ein - 40,900
For example, if you wish to measure up to 20 volts, the resistor value should be:
4,090 x 20 - 40,900 = 40,900 ohms
Since you will not always be able to get the exact resistor value that you calculated, you can
determine the logger's actual input range by plugging the value of the resistor (R) you obtain
back into the equation. For example, if the closest resistor you could obtain was 42k ohms,
then the actual voltage input range would be:
Ein = (R + 40,900) / 4,090
(42,000 + 40,900) / 4,090 = 20.27V
This value will be needed when it comes time to create your own custom equation using
TrendReader software.
- IMPORTANT! 1
- SmartReader Data Loggers 2
- TRADEMARK NOTICES 3
- LIMITED WARRANTY 4
- Table of Contents 5
- 1.1.1 Features 9
- 1.1.2 Description 10
- 1.1.3 Programmed Operation 10
- 1.1.5 How to Use SmartReaders 11
- 1.1.6 Specifications 13
- 1.1.7 Approvals 14
- SmartReader Software Driver 15
- 1.2.1 Logger Status 16
- 1.2.2 Logger Channels 18
- 1.2.2.2 Channel Calibration 20
- 1.3.1 Description 21
- 1.3.2 Setup 21
- Other Applications 22
- 1.4.1 Description 23
- 1.4.2 Setup 23
- 1.4.3 Accessories 24
- 1.4.4 Troubleshooting 25
- 1.4.6 Specifications 26
- 1.5.1 Description 28
- 1.5.2 Setup and Use 29
- A60FL / A65FL 29
- A70FL / A75FL 30
- 1.5.4 Specifications 31
- 1.5.5 Troubleshooting 31
- 1.6.1 Description 32
- 1.6.2 Setup 33
- 1.6.3 Pressure Calibration 34
- 1.6.4 Specifications 35
- 1.7.1 Description 37
- 1.7.2 Setup and Use 37
- 1.7.3 Specifications 38
- 1.7.4 Calibration 39
- 1.8.1 Description 41
- 1.8.2 Setup and Use 41
- 1.8.3 Specifications 42
- 1.8.4 Calibration 43
- 1.9.1 Description 45
- 1.9.2 Setup 45
- 1.9.3 Choosing Input Channels 48
- R = 200 / Iin 52
- 1.9.7 Specifications 59
- 1.9.8 Applications 60
- 1.10.1 Description 62
- 1.10.2 Setup and Use 62
- SmartReader 9 Pulse Logger 64
- 1.11.3 Quick-Start Tutorial 65
- 1.11.7 Specifications 69
- 1.12.1 Description 70
- 1.12.2 Setup 70
- 1.12.3 Accessories 71
- 1.12.4 Troubleshooting 72
- 1.12.6 Specifications 73
- Monitoring Resistance 75
- Temperature and 77
- Relative Humidity 77
- Calibration 77
- L" reading 79
- H" reading 79
- L - 170 x bH) / 428 79
- H - bL) - 1) 79
- L - 145 x bH) / 296 81
- Thermistor Temperature 82
- 1.15.4 Setup and Use 83
- 1.15.5 Specifications 84
- SmartReader Data Logger 89
- 1.15.7 Custom Probes 92
- 1.15.10 Probe Assemblies 95
- Sample Rates 97
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