IntelliPack Series 841T Transmitter/Alarm User's Manual Frequency Input
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Unipolar Signal Configuration:
Input Amplitude:
0 to 3V minimum range, 0 to 100VDC
maximum range.
Input Threshold:
Configurable for 1.5V or 5V, typical.
Input Hysteresis:
Configurable for
25mV (at 1.5V
threshold), or
83mV (at 5.0V threshold), typical.
Bipolar Signal Configuration:
Input Amplitude (0-20KHz):
50mV minimum (with
25mV hysteresis) or
150mV minimum (with
83mV
hysteresis), to
100V peak-to-peak maximum.
Input Amplitude (Above 20KHz):
100mV minimum
(with
25mV hysteresis) or
200mV minimum (with
83mV hysteresis), to
100V peak-to-peak maximum.
Input Threshold:
0mV nominal, 0.01V typical with
25mV hysteresis; 0.03V typical with
83mV hysteresis.
Input Hysteresis:
Configurable for
25mV or
83mV,
typical.
Minimum Input Pulse Width:
Frequency inputs: 10us
Pulse counting inputs: 5ms.
Input Overvoltage Protection:
Bipolar Transient Voltage
Suppressers (TVS).
Resolution:
The sampling mechanism used for the 100Hz
and 1000Hz ranges results in decreased internal resolution
with increased frequency. This resolution is generally better
than the display resolution indicated in Table 4. However, as
the input frequency approaches the upper end of the 100Hz &
1000Hz ranges, the reduced internal resolution effectively
approaches twice the display resolution noted in Table 4 for
these ranges.
Table 4: Input Range Resolution
Input Range
Display Resolution
0 to 100.00Hz
0.01Hz
0 to 1000.0Hz
0.1Hz
0 to 50000Hz
1Hz
0 to 65535 Pulses
1 Pulse
Input Zero/Span Range Turn-Down (See Table 5):
The
configuration software may be used to calibrate an output
response to input zero & full-scale values that are subsets of
their nominal input range end points. For best results, select
the smallest input range that contains the desired zero and
full-scale input signals. Refer to Table 5.
Table 5: Input Zero/Full-Scale Span Selection
Nominal
Input Range
Recommended Input Span Calibration
Range
0 to 100.00Hz
10Hz min span within 0 to 100Hz range.
0 to 1000.0Hz
100Hz min span within 0 to 1KHz range.
0 to 50000Hz
1000Hz min span within 0-50KHz range.
0 to 65535
Pulses
1000 pulses min span recommended. All
spans must include 0 as low endpoint.
Input & Alarm Accuracy:
Module timing is crystal based for
best accuracy, temperature stability, and minimum long term
drift. For input and alarm accuracy refer to Table 6. Table 6
does not include analog output or overall accuracy (refer to
Table 7). Note that the sampling mechanism used for the
100Hz and 1000Hz ranges results in decreased resolution
near the upper end of the range, thus decreasing effective
accuracy in this range.
Table 6: Input Measurement & Alarm Accuracy
Nominal
Input Range
Accuracy at 25
C
Accuracy Over
Temperature
0 to 100.00Hz
0.02Hz (f
50Hz)
0.04Hz (f
50Hz)
0.04Hz (f
50Hz)
0.06Hz (f
50Hz)
0 to 1000.0Hz
0.2Hz (f
500Hz)
0.4Hz (f
500Hz)
0.4Hz (f
500Hz)
0.6Hz (f
500Hz)
0 to 50000Hz
+/-10Hz
+/-15Hz
0 to 65535
pulses
+/-1 pulse
+/-1 pulse
Input Impedance:
35K
, typical.
Input Response Time/ Input Filter Bandwidth:
-3dB at 35KHz,
typical. See also Input Acquisition Time, Relay Response
Time, and Output Update Rate for more information.
Input Acquisition Time:
Frequency inputs: 100mS to 1 second
(varies with input frequency). Pulse counting inputs: Input
polling every 5ms (samples event at a 1.2ms rate).
Input Pullup/Pulldown:
Software selectable 2.7K
input pullup
to +5V and a 1K
input pulldown to return.
Input Debounce (Pulse counting inputs only):
0 (disabled) to
1 second, configurable in 5ms increments. You must select
appropriately with respect to input signal bandwidth and
characteristics.
Input Averaging (Frequency inputs only):
Running average of
1 (disabled by default), 2,4,8, or 16 input samples, software
configured. Input averaging > 1 will increase the response
time.
Noise Rejection (Normal Mode):
Not Applicable.
Noise Rejection (Common Mode):
80dB @ 60Hz, typical with
100
input unbalance.
Input Excitation Supply:
+12VDC or +8.2VDC, typical at 10mA
load (current limited to approximately 24mA).
Counter Reset Input:
TTL or open collector/drain signal (5V
logic) may be wired directly to the input terminals of the
module to reset the counter value to 0. Signal is active low.
Minimum reset pulse width is 5mS. Note that the counter can
also be reset to zero by clicking on the “Reset Event Count”
button of the IntelliPack Configuration Software.
Frequency Input Reference Test Conditions:
0 to 50KHz
Bipolar 5Vpp input; Threshold 0.0V; Hyst/-25mV;
Input Averaging = 1; Ambient = 25
C; Power Supply =
24VDC; Output = 4-20mA, Ascending (4mA represents 0Hz;
20mA represents 50KHz). For 841T-1500 units, additionally:
Relay High Limit at 50KHz; 250Hz Deadband; Automatic
relay reset; Failsafe mode; Relay Time Delay of 100mS.
Pulse Counting Input Reference Test Conditions:
0 to 25K
pulses; Unipolar 0 to 5V input; Threshold 1.5V; Hyst/-
25mV; Count positive pulses with Automatic Reset; Input
Debounce = 0; Ambient = 25
C; Power Supply = 24VDC;
Output = 4-20mA, Ascending (4mA represents 0 pulses;
20mA represents 25K pulses). For 841T-1500 units,
additionally: Relay High Limit at 25K pulses; Automatic relay
reset; Failsafe mode; Relay Time Delay of 100mS.
ANALOG OUTPUT SPECIFICATIONS
These units contain an optically isolated DAC (Digital-to-
Analog Converter) that provides a process current or voltage
output. Calibration can occur with respect to any output range,
but only one of the outputs may operate at a time.