Connections for the Model 106 with Pulse Output Flow Sensors

Connections for the Model 106 with Pulse Output Flow Sensors
Flow Sensors.
Flow Meters.
Flow Controllers.
We Measure Better.
P.O. Box 1340 - Georgetown, TX 78627
(800) 861-0231
(512) 863-0231 outside U.S.A.
Fax: (512) 863-0671
Connections for the Model 106 with Pulse Output
Technote 106-001a, page 1 of 2
4-conductor cable:
RED: Connect to 12-15 VDC power (less than 55 mA typical).
For models with “E” option, connect to 18-24 VDC power.
BLACK: Power common.
WHITE: BOSFET output leg 1 (see notes below).
GREEN: BOSFET output leg 2 (see notes below).
Notes:
a. This model features a passive BOSFET pulse output, proportional
to flow rate. Typical scale is 0-400 Hz (0 Hz representing
zero flow, 400 Hz representing 100% rated flow). Each unit
will be shipped with a calibration certificate detailing actual
Hz output at 100% rated flow.
b. Consider the BOSFET pulse output similar to a fast-acting switch
connected to the WHITE and GREEN wires.
c. All systems should be connected as in Figure 2 on page 2. Figure
1 below provides a typical system for a non-isolated pulse
output powered by 12VDC.
FIGURE 1. Typical Non-Isolated Pulse Output Connection
MODEL 106
FLO-SENSOR
BLACK
V1 (ground) -
WHITE
RED
1000 ohm
V1 (power) +
TO V1+
GREEN
Frequency Output
(peak = Vout)
V1 = 11-15 VDC power source.
Vout will equal V1.
1000 ohm resistor should have a 1/4 watt or higher rating.
Do not use above diagram for models with "E" option.
VISIT OUR WEBSITE: www.mcmflow.com
Connections for the Model 106 with Pulse Output
Technote 106-001a, page 2 of 2
FIGURE 2. Connection diagram for all installations (isolated and non-isolated)
MODEL 106
FLO-SENSOR
BLACK
V1 (common) -
Passive
BOSFET Output
RED
V1 (power) +
TO V1+
GREEN
R2
V2 (common) -
WHITE
R1
V2 (power) +
Frequency Output
(peak = Vout)
V1 = 11-15 VDC power source (18-24 VDC for models with "E" option)
V2 = signal power source (for isolated output, this source must be isolated from V1)
For non-isolated output, V2 can utilize V1 power source connect V2+ to V1+ and V2- to V1-.
Vout (pulse output peak voltage) will be approximately V2 x [R2 / (R1 +
R2)]. Keep V2 less than 36 VDC. Be sure that V2 / R1 does not exceed 20
mA (.020). R1 and R2 should be calculated in ohms (1K resistor = 1000).
Resistors used to produce the desired pulse output can be standard 5%
composition types – verify power to select resistor wattage. R1 wattage =
V2 X V2 / R1 (example: 15 x 15 / 2000 = 0.113 worst case, so choose a 1/8
or ¼ watt resistor for R1). R2 wattage = Vout x Vout / R2 (example: 12 x
12 / 1000 = 0.144 so choose a ¼ watt resistor). R2 is not required if Vout
can be equal to V2 – be sure that R1 does not allow maximum current to
exceed 20 mA through the Model 106 BOSFET (V2 / R1 < .020). The V2
source should be low impedance and low noise.
If output isolation is not required, V2 can use the V1 power source (11-15
VDC or 18-24VDC for “E” option).
VISIT OUR WEBSITE: www.mcmflow.com
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