42213 Sarah Way, Temecula, CA 92590,
Tel: 800-854-8530 (USA)
Micro Series Analog Input
Flow Rate Meter
& Analog Flow Totalizer
Rate, analog square root, batch control, time
based on rate
from 0-1 mA, 4-20 mA or 0-10 V signals.
- Available in three digit heights:
0.56" for panel mounting,
1.0" (Mighty-1) or
5.0" (Mighty-5) for
long-distance indoor/outdoor viewing.
- Square root readout from analog output of differential
pressure flow transducers
- 0-1 mA, 4-20 mA, 0-10 V inputs, or
special factory scaling.
- 6-digit resolution.
- Field scalable for direct readout in
- Isolated 5, 10, or 24 Vdc excitation
output to power sensors.
- Selectable "count by" of 10 or
100 with rounding.
- 25/s update rate.
- Peak value display.
- Green or red LED display.
- Choice of isolated plug-in
options for control and computer interface:
4-20 mA & 0-10
V analog output,
RS232/485 serial I/O,
low voltage AC & DC power.
case environmentally sealed to NEMA-4X from front panel.
- 1/8 DIN
version certified to UL 3101-1, CAN/CSA-C22.2,
EN 61010-1 (CE Mark).
All capabilities of
the Standard Counter, plus:
- Custom curve linearization.
- Total based on rate and time.
- Batch control based on rate and total.
- Display of process time based on rate
Standard Counter Version
Rate with Square Root Extraction
meter with the Standard counter main board and a voltage-to-frequency (V-to-F) signal
conditioner board (shown to right) is able to accurately extract the square root of analog signals. The
display is a full six digits. The three standard input ranges are 0-1 mA, 4-20 mA and 0-10
V. Special input ranges are available from the factory.
One application of the Standard V-to-F meter
is to accurately display flow rate in engineering units, such as gallons per minute, from
the 4-20 mA signal of a flow transducer with a linear or squared output.
Extended Counter Version
- Batch Control with Linearized Total
The Micro V-to-F meter with
the Extended counter main board can also totalize the linearized flow rate derived from
the analog rate signal, count up to a preset value, or down to zero from a preset value
for batch control. The analog input may or may not require linearization. In addition to
rate and total, the grand total of the batches or the number of batches can also be
displayed by pressing a front panel key.
Use of the Extended V-to-F meter as an up or
down-counting batch controller requires the dual-relay output board option. One of the
relays is dedicated to ON/OFF batch control. The other relay is available to slow down
rate near the setpoint or to provide another alarm or control function based on rate or
One application of display of rate plus total is to read out kilowatts and
kilowatt-hours based on 0-1 mA from a watt transducer.
- Custom Curve Linearization
The relationship between the analog input and
the value to be displayed can have a linear, square root, or custom curve relationship.
For custom curve linearization, up to 240 data points can be input into a spreadsheet or
text file by the user. The computer then calculates spline-fit segments, which are
downloaded into the meter via RS232. Custom-linearized rates can be totalized and be used
for batch control.
Like the Extended analog DC panel meter, the Extended V-to-F meter can
linearize and display analog inputs based on a custom curve unrelated to flow, for
instance to read out the volume of an irregularly shaped tank based on level or pressure,
or to linearize a nonlinear transducer.
The Extended V-to-F meter can
display a time inversely proportional to measured rate, such as the time that it will take
a conveyor to traverse an oven. As the rate of the conveyor is increased, the displayed
baking time will be decreased.
Principles of V-to-F Operation
The V-to-F signal conditioner
board converts the full-scale 0-1 mA, 4-20 mA or 0-10 V analog signal to a frequency of
10-110 kHz. This frequency is determined by measuring period over a selected gate time
(from 10 ms to 200 s) and taking the inverse of period. Selecting a short gate time
provides a much higher update rate than conventional counting-type frequency meters. At
the lowest frequency of 10 kHz and the minimum gate time of 10 ms, the meter is capable of
25 updates per second.
Scaling to rate in engineering units and
totalizing are done mathematically. Totals are stored in nonvolatile memory in case of
High Resolution Display
The display of rate or total
may be scaled to ±999,999. The two least-significant digits may be set to display zero
with rounding or be active digits. In addition to a selectable gate time for rate
measurement, an adaptive filter can reduce variations due to noise while rapidly
responding to actual changes in signal level.
output, dual-relay controller,
serial communications boards can upgrade Micro and Mighty Series meters from a stand-alone
monitor to system interface and control. The analog 4-20 mA or 0-10 V analog output will be linearized to the reading,
which may be rate or total.
meters can be powered from
95-240 Vac ±10% and 95-370 Vdc, or
optionally from 12-34 Vac and 10-48 Vdc.
Any setup functions and front panel keys may be locked out for
simplified usage and security. The popular
DIN version with 0.56" high digits is environmentally sealed to
NEMA-4X (IP65) from the front when panel mounted, and is
available with red or green LEDs.
|6 digits, 7-segment
Available with 0.56", 1.0", 4.0" or 5.0" digits.
High brightness red. Green available with 0.56" digits.
-999999 to +999999
Four LED lamps
Other signal levels
mA, 4-20 mA, 0-10 V
Output & Display Updates
Gate time + 30 ms (max)
Selectable 10 ms to 199.99 s
Same as conversion time
±10% and 95-370 Vdc
12-34 Vac and 10-48 Vdc
DC or 49-440 Hz
Safety-rated to 250 Vac, meter ground to earth ground,
DC to 60 Hz, 4.2 kVp per High Voltage Test
130 dB, DC to 60 Hz
Vdc ±5%, 100 mA max
10 Vdc ±5%, 120 mA max
24 Vdc ±5%, 50 mA max
50 Vdc to meter ground
-40°C to 85°C
95% at 40°C, non-condensing
NEMA-4X (IP-65) when panel mounted
Flow from a Differential Pressure Transducer
||An ideal application for the Standard Micro V-to-F
meter: readout of flow based on the 4-20 mA analog signal from a differential pressure
transducer. Options include dual relays for alarm or control, isolated analog output to
turn the meter into a transmitter, and RS232 or RS485 serial communications.
Up- or Down-Counting Batch Controller
||An ideal application for the Extended Micro V-to-F
meter: up- or down-counting batch controller. The dual-relay card is required. One relay
is dedicated to batch control, the other relay is available to alarm the rate or total.
The signal input can be linear or nonlinear. The display can be toggled between rate and
Volume of an Irregularly-Shaped Tank
||The Extended Micro V-to-F meter can linearize analog
signals for display and alarm using custom curve linearization with multiple nonlinear
segments. As illustrated, tank level is measured by an ultrasound detector, which
transmits a 4-20 mA signal. This signal is then converted to a highly accurate volume
reading. The linearized rate readings can also be totalized.
Process Time from an Analog Rate Signal
||A unique application of the Extended Micro V-to-F
meter: displaying process time based on the 4-20 mA or 0-10 V signal from a rate meter. In
the above example, a tachometer transmits the speed of a conveyer belt through an oven.
The meter displays baking time in the oven using the mathematical relationship time =
distance / speed.
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