Omega RD100B - Manual (Page 16)

1-2
1.2 Measuring Input Section
Input Section
Number of Measurement Channels and Scan Interval
The recorder samples the input signals on the measurement channels at the scan
interval to obtain the measured values.
Model Number of Channels Scan Interval
1-pen model 1 125 ms
2-pen model 2 125 ms
3-pen model 3 125 ms
4-pen model 4 125 ms
Dot model 6 1 s
(However, the scan interval is 2.5 s when the
integration time of the A/D converter is 100 ms.)
Input Type, Measurable Range, and Computation
The recorder can measure the following types of inputs.
Input Type Measurable Range
DC voltage DC voltage in the range of ±20 mV to ± 50 V
1-5V See “1-5V” below.
Thermocouple Temperature range corresponding to each type: R, S, B, K, E, J, T, N, W, L, U,
and WRe
RTD Temperature range corresponding to each type: Pt100Ω and JPt100Ω
ON/OFF input Contact input: Open contact is OFF (0). Closed contact is ON (1).
Voltage input: Less than 2.4 V is OFF (0). Greater than or equal to 2.4 V is ON (1)
• 1-5V
1-5V is scaled to values in the appropriate unit to be used as measured values. Also,
the low-cut function (input less than 0% is fixed to 0 (scale left value)) can be used.
• Current Input
A shunt resistor is attached to the input terminal. The current signal is converted to a
voltage signal and measured. The measurable range is the range equivalent to the
“DC voltage” range indicated above after converting the current to the voltage signal.
Note
Three types of shunt resistors (250 Ω, 100 Ω, and 10 Ω) are available for current input (see
“Optional Accessories (Sold Separately)” on page v). For example, a 250-Ω shunt resistor is
used to convert the signal to the range of 1 to 5 V for 4 to 20 mA input.
• Range Type, Measurable Range, and Recording Span
Various “range type” are available for the different types of inputs (for example
thermocouple R). Each range type has a preset measurable range (0.0 to 1760.0°C
for thermocouple R). Measurement can be made by specifying an arbitrary range
within the measurable range as the input range. The measured values in the input
range are recorded on the chart paper. The range of measured values that are
recorded is called the recording span.
0.0°C
300.0°C (leftmost value of span)
1760.0°C
1500.0°C (rightmost value of span)
Input range or
recording span
Measurable range
(Thermocouple R example)
Setting the input range: Section 5.1