AW Gear Meters HEF-1 - Manual

AW Gear Meters 8809 Industrial Drive, Franksville, WI 53126  web: www.awgearmeters.com
 Tel: 262-884-9800  Fax: 262-884-9810  Email: [email protected]
REV. 12/08 HEF-1.DOC
HEF-1 Hall Effect Pickup Module
Installation & Technical Guide
Installation:
•
Ensure that the flow meter sensor cavity is free of debris prior to installation.
•
Screw the HEF-1 into the flow meter by hand until the sensor nose contacts the bottom of the cavity.
• Do not screw in harder than hand tight, as a thin metal section is under the sensor nose.
Please heed the following warning:
CAUTION: DO NOT EXCEED 7 NEWTON-METERS FORCE TO SEAT THE SENSOR, THIS IS
EQUIVALENT TO HAND TIGHT. EXCESS FORCE MAY CRUSH THE SENSOR NOSE OR
DAMAGE THE FLOW METER BY FORCING THE METAL SECTION UNDER THE SENSOR INTO
THE MEASURING CHAMBER.
Wiring should be installed by a qualified instrumentation technician.
Some basic installation guidelines are reviewed overleaf.
Description:
The HEF-1 is a Hall Effect sensor which is compatible with the JVM and SLG series of flow meters.
The sensor detects the rotation of the flow meter’s gears and emits a frequency signal proportional
to flow.
The output signal is an NPN, sourcing square wave pulse which has a duty cycle of
approximately 50%.
Technical Data
Supply Voltage: 10 to 24 Volt DC
Supply Current: 18 mA @ 15 Volt, Max 25 mA
Minimum Signal: 0.5 Hz
Signal Output: Square wave, V
High
≈ V
CC
- 2V
V
Low
≈ 0.1V
Duty Cycle:
50%
Frequency Output: Flow dependent, up to 2000 Hz
Load:
>500Ω
Driving Capacity: 10 mA Max
Temperature Range: -60°F to 185°F (-50°C to 85°C)
Connections:
A: +10 to 24 Volt DC supply voltage
B: Ground for supply and signals
C: Frequency signal output
Figure 1
AW Wiring Color Code:
Supply Voltage: Red
Ground: Black
Signal: White
+SUPPLY
OUTPUT
100Ω
3.3KΩ
2N4123
1N4148
1N4148
GROUND
HEF-1