McNab Model AP-IF Conductivity Indicator
The Aqua-Purometer I (F) series are single
range conductivity indicators and controllers. The instruments are
available in six linear ranges covering the conductivity spectrum from
ultra pure water to highly concentrated solutions. These instruments use
proven solid state circuitry housed in a rugged, industrial cabinet to
provide an economical and straight forward approach to process control
The Aqua-Purometer I (F) is available in
six linear ranges: 0-2, 0-20, 0-200, 0-2000, 0-20,000, and 0-200,000
micromhos specific conductance. The
solid state (IC) circuitry provides linear outputs to the panel meter and
to the recorder output terminals. Since the recorder signal is linear,
special recorder paper is not required.
A unique feature of the Aqua-Purometer I
(F) is the meter displayed set point.
To enter the set point, one depresses the internal Calibrate Switch
and rotates the internal Set Point Control until the desired alarming
point is reached by the needle on the meter scale.
Releasing the switch enters the set point.
The use of the larger meter settings than is normally scale permits
more accurate possible with smaller calibrated pointer knobs.
Furthermore, because the set point is displayed on the meter, the
error producing step of translating panel control calibration to meter
calibration is eliminated. Also
eliminated are the errors associated with loose pointer knobs and smudged
or worn-away panel control calibrations.
The Aqua-Purometer I (F) provides both energized and non-energized, normally open and
normally closed contacts for flexibility of application. The controller
relay is a sealed, plug-in type with contacts rated at a husky 5 amps. The
preset non-symmetrical hysteresis control circuitry eliminates relay
chattering due to electronic noise.
The power supply of this instrument can
operate either on 115VAC or 23OVAC 50/60HZ via an internal switch.
Line voltage variations of +/- 10% of nominal value are easily
handled. The power supply is
transformer isolated and fuse protected.
The cabinet is made of all-welded
construction of sturdy No. 18 gauge steel. A hinged front door provides
easy access for routine inspection or servicing. Servicing is further
facilitated by the use of plug-in replacements for the most serviced
components. A rubber gasket provides a water resistant seal around the
cabinet door. The door is
provided with a NEMA-4 type latch. The cabinet is designed for wall, or
semi-flush mounting (with optional kit).
The panel has a visually pleasing gray exterior which is set off by
silver and black artwork. The amber power-on and the red alarm lights are
180° easy viewing, long life neon lamps.
The meter is a rugged industrial type with an easily read,
color accented scale. All controls except the power switch are internal
Aqua-Purometer I (F) uses McNab screw-in style cells.
A typical cell is shown at left.
This cell design minimizes the trapped air problems associated with
many competitive designs. Standard
¾” and 1” NPT sizes are available.
Cells are supplied with a six-foot, dressed cable.
For explosion-proof cells or other special applications, contact
View probe specifications for the AP-I family of McNab analyzers.