F
OR
M
ODELS
: JGI, JGM, JGN, JGP
AND
JGQ
S
ECTION
4 L
UBRICATION
PAGE 4-46
3.
Remote mounted Proflo PF1 and proximity switch. The Proflo will excite the
proximity switch circuit with 3 volt battery power to detect the state of the proxim-
ity switch. Ariel has defined a maximum wire distance between the proximity
switch and the remote mounted Proflo:
Maximum DistanceCondition
600 feet (183 m)Using standard Proflo PF1 batteries
10,000 feet (3050 m)Powering Proflo PF1 from other power source
The above distances are conservatively calculated based on the following
assumptions/considerations:
1. Standard 22 gage instrumentation wire at 68°F (20°C) in a continuous run.
2. Not significantly degrading battery life.
No electrical noise injected into wire run.
If the Proflo PF1 is to be panel mounted, Ariel recommends removing the batter-
ies and using the power supply from CCT. See “Proflo PF1 Accessories Avail-
able:” on page 4-49.
4.
The Proflo PF1 will record any setup changes to the EEPROM.
5.
The white wires on the Proflo PF1 can be used for other applications than read-
ing divider block cycle times. The Proflo can record history of any dry contact
switch. Example: history of a liquid dump valve, history of a high temperature
switch, history of a valve limit switch.
6.
The Proflo PF1 electronics is equipped with reverse polarity protection/correc-
tion. The electronics will automatically correct a reverse polarity output connec-
tion on both the pulse and alarm outputs.
Proflo Normally Open and Normally Closed Definition:
There has been some confusion among PLC programmers and electrical people over the def-
inition of Normally Open (NO) and Normally Closed (NC) as applied to the Proflo and DNFT.
Most electrical components define NO or NC operation as the default state or on the shelf
state. Example: A NO solenoid valve is open when the coil is not energized. When the coil is
energized the valve will close. A NC solenoid valve is closed when the coil is not energized.
When the coil is energized the valve will open. This logic is not used when defining the DNFT
or Proflo electrical contacts. The DNFT and the Proflo use the same definition of NO and NC
switch contacts. Definitions for Proflo and DNFT contact are switch states after the divider
block has cycled.
NO
= Normally Open when Running. Switch is open when the divider block is
cycling. This is a non-fail-safe operation because if the unit is running and a wire
falls off, the control system will not alarm/shutdown.
NC
= Normally Closed when Running. Switch is closed when the divider block is
cycling. This is the fail-safe operation because if the unit is running and a wire
falls off the control system will alarm/shutdown.
Proflo PF1Ariel recommends using Normally Closed (NC) configuration.
The Ariel Pro-
flo is provided from the Ariel factory programmed for NC operation.
The reason NO and NC are defined this way is that it is easier for mechanics and operators
who do not have an electrical background to understand the switch state when the divider
block is cycling.
