Installation
January 2023
•
Rev. 0
• Standard Devices User Manual
9
Analog Signals
Primary Analog Output Signal
Most devices include a primary analog output signal that
is linear over its entire range. For ranges that start at 0
Vdc, a zero-pressure or no-flow condition is indicated at
approximately 0.010 Vdc. Full scale of the device is indicated
by the top of the range: 5 Vdc for 0–5 Vdc, 20 mA for 4–20
mA signals, and so on.
Option: Secondary Analog Output Signal
The default 8-pin mini-DIN connector places the secondary
analog output on pin 2 for both voltage and current signals.
Your device’s secondary analog signal may differ from its
primary output signal.
A calibration sheet ships with the device showing which
output signals were ordered.
Option: 4–20 mA Current Output Signal
Controllers:
If the controller has a primary or secondary
4–20 mA current output signal, it requires 15–30 Vdc power.
Meters and gauges:
If the meter or gauge has a 4–20 mA
current primary or secondary output signal, it requires 12–24
Vdc power.
⚠
Warning:
Do not connect 4–20 mA devices
to “loop powered” systems, as this damages
portions of the circuitry beyond repair and voids
the warranty. If the device must interface with
existing loop powered systems, use a signal
isolator and a separate power supply.
Using Ground to Tare (Meters and Gauges)
You can tare your meter or gauge remotely by momentarily
grounding pin 4. When the switch is closed, the device tares.
Operation resumes when the switch is released. You can also
tare with the front controls (
) or serial commands
(
). Taring flow should only be done in a true zero-
flow condition and taring pressure should be done when the
device is open to the atmosphere.
Option: Charging a Portable Meter or Gauge
Portable batteries are partially charged before shipping.
When fully charged, the typical battery life is 18 hours with
a monochrome display, or 8 hours with a TFT color display.
Dimming the backlight increases battery life. When the battery
indicator displays as completely empty, about 15 minutes of
battery life remain.
Charge the device using the supplied USB cable (micro-B to
type A) or a similar cable. Any USB outlet on a computer or
portable power supply may be used, but charging is fastest
(approximately 3.5 hours) when using the supplied 2.0 A
power supply.
The red indicator LED on top of the device lights up to indicate
that the unit is charging, and turns off when the battery is
fully charged.
Your meter may be used while it is charging. If the battery has
been fully depleted, you may need to charge the meter for a
full minute before the device can be turned on.
!
Warning:
The safe charging temperature
range is 0–45°C (32–113°F). If internal
sensors detect temperatures outside of
this range, the battery will not charge.
Pin 4
Ground
Pin 8
Connect to tare
4
8
Main display
with battery
information and an active charging
indicator (lightning bolt).
