Electronic Scalable Transmitters
Models PFT-1E & PFT-4E
OVERVIEW
The models PFT-1E and PFT-4E are electronic scalable pulse transmitters with AC/DC inputs and outputs. The model PFT-1E combines with the disc and OP meter lines while the model PFT-4E is used with the Industrial turbo meter line.
These electronic transmitters can be scaled to almost any pulse rate, allowing recalibration by resetting the scale factor with four switches. The PFT-1E transmitter can be calibrated for use with different size meters simply by re-setting the switches.
OPERATION
The flow of fluid through any of the meters results in movement of the meter measuring element, which rotates an internal 4-pole magnet. The poles of the magnet are sensed by a magnetoresistive pickup that produces four pulses for each revolution of the magnet. These signals are sent to the electronic board where they are conditioned and scaled to the desired unit of flow (for example, one pulse per ounce, per gallon, and so on). The meter factor, which
is the number of revolutions of the measuring element per unit of measure, rarely coincides with the desired application requirements and has to be modified or scaled
to standard engineering units. This scaled pulse is then sent to secondary equipment such as a controller or remote totalizer in the form of a switched AC voltage or a DC current sinking pulse (open collector NPN transistor).
APPLICATIONS
Designed for totalizing, rate calculation or batching through direct input into a totalizer, pre-set counter or process controller that does not have scaling capabilities.
PFT-1E Transmitter
FEATURES
•Sensor will withstand fluid temperatures to 250° F
•Solid-state circuitry for long life
•Fast calibration with (4) switches; change gears are eliminated
•LED indicator for visual pulse detection
•Optically isolated outputs prevent false counts due to line noise
•Field retrofit available
•Rugged, high impact resistant housing
•Corrosion proof protection
•Water tight - NEMA 4X Rating
•Remote mounting available
XMT-DS-00837-EN-15 (January 2018)
Product Data Sheet
Transmitter Specifications
TRANSMITTER SPECIFICATIONS SCALE FACTOR CALCULATION
Housing |
Material |
High impact, reinforced |
|
|
Nylon |
|
Mounting |
Bayonet type with set |
|
|
screw, 360° orientation |
|
Connections |
Two 1/2” NPT threaded |
|
|
conduit ports |
|
Protection |
NEMA 4X (water tight & |
|
|
corrosion proof) |
Operation |
Sensor |
Magnetoresistive sensor |
|
Scaling & Calibration |
(4) switches |
|
Operating |
Scaler Board: – 4…185° F |
|
Temperatures |
Sensor: – 4…250° F |
Electrical |
DC Input Power |
12…24V DC |
|
DC Output |
Opto-Isolated open |
|
|
collector NPN transistor |
|
Transistor Rating |
50 mA @ 24 VDC |
|
AC Input Power |
115 VAC ± 15% |
|
AC Output |
Opto-isolated Zero |
|
|
Crossing Triac |
|
Triac Rating |
130 V RMS @ 500 mA |
|
Scaling Resolution |
0.0001 to 0.9999 |
|
Max. Pulse |
See chart |
|
Resolution |
|
(Limit AC pulse output to 10 pulses per second due to electrical characteristics of Triac.)
Transmitter Selection Chart |
|
||
Meter Type |
PFT-1E |
|
PFT-4E |
RCDL |
X |
|
|
IND. TURBO |
|
|
X |
OP |
X |
|
|
1 2 3
2 1
Pulses per Gallon Wanted
Scale Factor = -----------------------------------------------
Transmitter Output in Pulses per Gallon
See the chart below for the average number of output pulses per gallon for your particular meter. For more precise calculations, use the information on the transmitter data plate when figuring scale factors.
Example
Compute the scale factor for a 3” turbo meter. (You want to measure the flow to the nearest 0.1 gallon.)
Scale factor = 10 / 24.80 = 0.4032
Enter 0.4032 on the scaling switches of the transmitter to read the meter flow to the nearest 0.1 of a gallon.
Meter |
Size |
Pulse/Oz. |
Pulse/Gal. |
|
|
|
|
RCDL-25 |
5/8 |
1.550 |
198.340 |
RCDL-35 |
3/4 |
0.989 |
126.671 |
RCDL-40 |
1 |
0.702 |
89.781 |
RCDL-70 |
1 |
0.366 |
46.752 |
RCDL-120 |
1-1/2 |
0.186 |
23.867 |
RCDL-170 |
2 |
0.114 |
14.565 |
|
|
|
|
IND. TURBO |
2 |
0.271 |
34.720 |
IND. TURBO |
3 |
0.194 |
24.800 |
IND. TURBO |
4 |
0.040 |
5.120 |
IND. TURBO |
6 |
0.017 |
2.160 |
OP |
1/2 |
1.742 |
222.960 |
OP |
1 |
0.599 |
76.640 |
OP |
2 |
0.161 |
20.560 |
|
|
|
|
Conversion Chart
(Wire colors from old style board) Shown with pin# on new board for same function
New Board Wire Color/Old Board
Pin 1 Blue (Blue/Brown)
Pin 2 Black (White/Black)
Pin 3 White (White/Black)
Pin 4 Brown (Blue/Brown)
Pin 5 Orange (Orange/Brown)
Pin 6 Brown (Orange/Brown)
Pin 7 Black (Black/Red)
Pin 8 Red (Black/Red)
Page 2 |
XMT-DS-00837-EN-15 |
January 2018 |
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