INSTRUCTION M ANUAL
pH/mV
CONTROLLER/RECORDER
LIMITED ONE YEAR WARRANTY
Manufacturer warranties all instruments (excluding batteries, damage
caused by batteries, probes, standards, buffers) against defects in
materials and workmanship for one year from date of original purchase.
During this warranty period, the manufacturer will repair or at their
option, replace at no charge a product which proves to be defective,
provided the product is returned, shipping prepaid to the manufacturer ’s
service center.
This warranty does not apply to damage caused by accident or misuse
or as a result of service or modification by other than an authorized
service center. No other express warranty is given. Repair or replace-
ment of product is your exclusive remedy. In no event shall the manu-
facturer be liable for consequential damages.
pH
Note:
Keep tightly closed. ph 10 buffers deteriorate very quickly when
exposed to the air.
NOTE:
regular basis, or any time the
and/or erratic.
15.0 TROUBLESHOOTING GUIDE
Both the single and dual probe controllers are designed for
maximum unattended operation on a continuous basis. Use the
following steps to isolate a problem and determine a probable
solution.
buffers will deteriorate if left exposd to the atmosphere.
pH
calibration is not permanent.
pH
reading response becomes slow
a.
To check electrode.
1.
Move
off scale, pointer should return on scale.
2. Using the Set adjust knob, the meter pointer should
travel the full scale.
3. Problem is probably in the probe side including the
BNC connectors.
b.
To check instrument operation.
I.
Exchange
functioning correctly.
2. W ith toggle switch in the Stby position, if the analog
meter pointer remains off scale, then the instrument is
at fault.
mV-Stby-pH
pH
switch to Stby. If the pointer was
probe and determine if meter is
It should be done on a
Table of Contents
Introduction..
1.0
Specifications..
2.0
Instrument Familiarity
3.0
3.1
Bench..
3.2 NEMA..
3.3 NEMA Dual.. ..............................................................
4.0
Internal Termina l Strip..
5.0
pH
Controller Operation..
6.0
Control Setup..
Calibration of the Analog
7.0
8.0
Recorder Calibration (Single Probe).
Recorder Calibration (Dual Probe).
9.0
10.0
11.0
12.0
13.0
14.0
15.0
Warranty . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Inside
Expanded
mV Operation
Specific Ion or ORP Operation..
Expanded Millivolt
pH
Buffers
Troubleshooting Gu ide..
......................................................
..................................................
....................................................
.....................................................................
.....................................................................
.........................................
................................................................ .
pH
Operation..
...................................................
(mV)
Operation..
&
Electrodes..
...................................
Note: Call distributor for further repair information.
16--
1 .O INTRODUCTION
13.0
EXPANDED MILLIVOLT
(mV) OPERATION
This
pH/mV
controller is either a single or dual probe
pH/mV control-
ler enclosed in a bench style aluminum case or a NEMA enclosure.
pH
Some models have an independent
monitor/recorder built into
the case. Dual probe input models function as a primary site
controller with a separate
pH/mV
monitor/recorder located at a
secondary site.
Bench models are protected by the aluminum case from normal
environmental conditions. The NEMA cabinet protects the internal
solid state components and meter functions from adverse environ-
mental conditions. The
pH/mV
readings are displayed on a six inch
mirror-backed analog meter. All models are equipped with a
scale expansion capability for use in critical
pH/mV
measurement
and control situations.
SPECIFICATIONS
2.0
2.1 Controller
pH
mV
Range
Range
0-14pH
+ 1800
mV
Control Limits
High
pH
mV
pH
Low
mV
Power Consumption
0
+ 1800
-
14
0
+
1800
55 watts
mV
pH
mV
115/23OV
@
pH
-
14
(maximum)
@
Power Output
350 watts
115V
pH/mV
10x
a.
b.
pH
Place
mV-Stby-pH
Use Set control knob and adjust analog meter pointer to
7.00 or 0
mV
switch to Stby.
(mV
scale).
c. Adjust Exp-Norm toggle switch to Exp and readjust
meter pointer to 0
d.
The controller is now calibrated for expanded scale
miliivolt
now reads
(mV)
570
mV
using Set control knob.
operation. The full scale of the meter face
millivolts
(mV).
Note: The single probe with recorder model will respond
expanded mode.
&
pH
14.0
14.1
A
pH
7 buffer is use to SET the meter. Then a
BUFFERS
Three buffers are normally used to calibrate
ELECTRODES
used along with the slope knob. Use the buffer which
to the
entire
pH
range you will be measuring. If your use will span the
pH
range, the instrument would be calibrated with two
buffers and checked with the third.
14.2 Check meter needle position before calibrating. The
needle position should be checked with the meter turned off. If
the needle does not read zero, then use the mechanical zero
screw to adjust needle to zero.
14.3 The electrode tip should always be immersed completely.
Freshly poured buffers should be used for each calibration.
NOTE: DO NOT POUR USED BUFFERS BACK
CONTAINER.
This will contaminate the good standards and give
inaccurate results.
Manual Temperature Compensation
Alarm Signal Output
Recorder
2.2
pH
Range
Accuracy
Response
14.4
0-100 ”
3.5V
PP (Squarewave)
20mA
o- 14
Between readings, rinse the electrode with distilled water
and carefully shake dry. CAUTION:
Do not wipe the electrode.
Wiping can cause static electrical charges which can result in
faulty readings.
pH
14.5 Rinse
fresh buffers if
electrode and repeat calibration procedure using
pH
O.OO+O.
1
10 limit was not observed.
2% Full Scale
1 sec. Full Scale
-2-
-15-
pH
0.00 is equal to
1.
pH
1 .OO is equal to
2.
pH
2.00 is equal to
3.
pH
10.00 is equal to
4.
5.
pH
11.00 is equal to
6.
pH
14.00 is equal to
pH
pH
pH
pH
3.00 to 4.40 mode to read full scale
3.00
3.20
pH
pH
pH
3.10
4.00
4.10
4.40
pH
units.
3.0
3.1
INSTRUMENT FAMILIARITY
Bench Models
Front Panel
OFF-ON
Power Light
Main Power Switch.
Main Power Indicator.
Note: Only the SET control knob should be used for
pH/mV
offset. The single probe with recorder model will respond as the
pH
meter pointer and reflect the scale expansion. Make a note
on recorder paper about new scale. The dual probe controller
can be used in the expanded mode, but the recorder portion
cannot be used in the expanded mode since it monitors
second site.
mV OPERATION
11 .O
12.0 SPECIFIC-ION OR ORP OPERATION
Connect the specific-ion or ORP electrode to the
a.
controller. Note: an adaptor may be necessary to connect
a U.S. standard connector to the BNC input.
b.
Exp-Norm switch in the Norm position.
c. Immerse electrode(s) in appropriate standard. Note
millivolt reading.
d.
Adjust Set control knob so analog meter pointer is
mV.
-
0 midscale
+
90mV
e. Meter is now adjusted to
full scale from original
millivolt reading.
The net millivolt
(mV)
change with some specific-ion or ORP
electrodes may be small, thus the need for scale expansion.
pH
at a
‘1,
Amp. Fuse
High Control
High LED
High TD
Low Control
Low LED
Low TD
Alarm LED
Fuse for electronic components. Located on
back panel of bench models.
Adjustable set control for High limit set point.
High limit indicator.
An adjustable Time Delay (TD) safety feature
which prevents over addition of neutralization
solutions. Time Delay (TD) interval (0 -10 min.)
determines the time that power is available to
the High side output terminals after the High
limit set point is exceeded. If the Time Delay
(TD) expires, the Alarm LED activates and
output power is terminated.
Adjustable set control for Low limit set point.
Low limit indicator.
An adjustable Time Delay (TD) safety feature.
Time Delay (TD) interval (0
mines the time power is available to the Low
side output terminals after the Low limit set
point is exceeded. If the Time Delay (TD)
expires, the Alarm LED activates and output
power is terminated.
Alarm indicator flashes intermittently when
either High or Low Time Delay (TD) expires.
mV-Stby-pH
Temp”C
Function switch (3 position), sets controller
function. Millivolts
Manual Temperature (Temp. “C) Compensation
pH.
for monitored
Not operable in
-3--14-
3.1
Bench Models... (Continued)
Exp-Norm
Set
Slope
Back Panel
8 Amp
‘I4Amp.Fuse
HIGH
Man-Off-Auto
LOW
Man-Off-Auto
PH
REF (black)
(BNC)
Expanded (Exp) or Normal (Norm) meter
scale operation.
Adjustable control to set
calibration, i.e.
pH
7.00. May also be used to
pH/mV
meter
offset meter.
Slope adjustment to calibrate
pH
4.00. Located on back panel of bench
pH
meter, i.e.
models.
8 Amp fuse to output terminals.
Fuse for electronic components.
High output terminal. AC receptical to power
external pump, solenoid, or relay for
control when High Limit is exceeded.
Three-position toggle switch.
Man
-
manual “On” position is used to power
and test external device.
Off- Off position to external device.
Auto
-
Functional mode for
pH/mV controller
operation. Activated by exceeding High Limit.
Low output terminal. AC receptical to power
external pump, solenoid, or relay for
control when Low Limit is exceeded.
Three-position toggle switch.
-
manual “On” position is used to power
Man
and test external device.
Off- Off position to external device.
Auto
-
Functional mode for
pH/mV controller
operation. Activated by exceeding Low Limit.
Female BNC connector for
pH/mV electrode
input.
Terminal input
reference electrode
Note: for
terminal post
post for separate pin
(pH,
ORP,
pH
pin reference (Black) unscrew
l/*
exposing a
REDOX).
1/,6”
diameter
hole. Insert reference pin and tighten.
pH/mV
pH/mV
b.
Adjust temperature compensation (Temp “C) to
temperature of
c. Place
d.
Adjust recorder pen to
pH
pH
buffer.
probe in
pH
7.00 buffer.
pH
7.00 using recorder SET
control.
e. Rinse probe with deionized or distilled water.
pH
f.
Place probe in
g. Adjust recorder pen to
4.00 buffer.
pH
4.00 using recorder SLOPE
control.
h. Rinse probe.
i. Check calibration and linearity by using
Place probe in
O.OO+
1
0.10
pH
10.00 buffer. Recorder pen should be
pH
units.
j. Rinse probe.
k. Recorder/monitor is now calibrated and ready for use.
I.
Check recorder paper length and adjust temperature
compensation knob to test solution temperature.
pH
10.0 EXPANDED
OPERATION
This controller has expanded mode capabilities. The scale
expandes 10 times (10x) which allows the operator to monitor
and control such changes in critical
pH,
specification and
a.
Controller
ORP/Redox
pH
meter must be calibrated in the normal
pH/mV
systems.
mode to determine slope adjust before use in the expanded
mode.
pH
b.
Place
known
probe in an appropriate buffer or solution of
pH
pH,
i.e.
4.00.
c. With the Set control knob, adjust meter pointer to
7.00. This prevents an electrical jolt to meter needle when
the meter is switched from normal mode to expanded
mode.
d.
Switch position of Exp-Norm from Norm to Exp mode of
operation.
pH
e. Adjust meter pointer to
value of 10.00 using the set
control knob.
pH
f. Now
the analog
meter is adjusted in the expanded
-4-
-13-
8.2
Calibration of Recorder- Without Buffers
a. Place function switch to Standby (Stby).
b.
Use controller Set control knob to adjust analog meter
to
pH
7.00.
pH
c. Adjust recorder pen to
7.00 using recorder
knob.
d.
With the Set control knob, adjust analog meter to
pH
2.00.
e. Recorder pen should follow analog meter pointer.
f.
Adjust recorder pen to match analog meter pointer
using Recorder Gain adjust. Both analog meter and
recorder pen should read
g. Restandarize controller
pH
pH
2.00.
using
Set control knob.
h.
To operate without the recorder, the recorder input plug
can easily be
disconected
inside the instrument panel on
the reverse side of recorder.
Both controller and recorder are now calibrated.
-
9.0
RECORDER CALIBRATION
The dual probe model is a
independent
pH
monitor/recorder in a NEMA case. Two
DUAL PROBE
pH/mV
controller with an
probes are required, a primary probe for the
controller function and a secondary probe for downstream
monitoring and recording.
a.
Connect second probe to recorder
the right side of case.
pH
7.00 buffer and
pH/mV
pH
input (BNC) on
Zero
Back Panel (Continued)
RDX (red)
Terminal input post for ORP or
electrode.
Slope
Slope adjustment for calibrating analog
meter. Located on front panel of NEMA
models.
Alarm
Alarm Output terminals Black (-)
Alarm is a pulsed 3.5 VDC,
Zero
Slope
3.2
NEMA Single Probe Controller/Recorder Models
This model is basically the model
Recorder zero adjustment screw. Set to
match
pH/mV meter reading i.e.
Recorder Slope adjustment screw. Set to
match
pH/mV meter reading i.e. 4.00.
in section 3.1 with an additional
recorder function. The recorder operates when the
are
function is activated. There
additional recorder controls to
adjust the recorder pen to match the analog meter function.
Recorder Controls
Zero
Gain
Recorder zero adjstment knob to match
pH/mV
meter set reading, i.e.
Recorder gain adjustment knob to match
pH
meter/m\/ set reading (similar
adjustment), i.e.
3.3
Basically the above model (section
pH/mV
NEMA Dual Probe Input/Recorder Model
3.2),
controller functions,
plus an additional
independent recorder/monitor function. Two separate monitoring
probes allow controller functions at a system ’s primary site and
pH
recording and monitoring at a secondary site downstream.
Appropriate
pH
set controls are incorporated for independent
recorder applications.
Recorder Controls
Power Switch
OFF
ON
ON REC
-12-
Three position power switch.
All power is off.
Controller power on.
Controller and recorder power on.
-5-
3.3
NEMA Dual Probe Input/Recorder Model (Continued)
Temp”C
Set
Slope
Manual Temperature (Temp “C)
Compensation for recorder
Recorder set adjust for
i.e.
pH
7.00.
Recorder slope adjust for
pH
calibration, i.e.
4.00.
pH
pH
calibration,
pH
probe.
j. Check calibration and linearity of probe by using
pH
pH
units.
10.00 buffer. Place probe in
should read
k.
Rinse probe.
10.00+0.10
pH
controller is now calibrated and the
High and Low control setpoints determined with the Time
Delay (TD) intervals set.
-
4.0
INTERNAL TERMINAL STRIP
NEMA MODELS ONLY
A twelve pin terminal strip is located behind the instrument panel
on the left inside vertical panel of the supporting frame. Access
is made by opening the hinged instrument panel (loosen the two
thumb screws on the right of the panel). The terminal strip is
numbered from the top to bottom (1 to 12).
Pin #
10
11
12
Case Ground (GND) for main input Power
1
Main input power AC,
Main input power AC,
2
High Output Power AC,
3
High Output Power AC,
4
High Output Power Ground (gnd)
5
Low Output Power AC,
6
7
8
9
Low Output Power AC,
Low Output Power Ground (gnd)
Not Used
Not Used
Alarm Output Positive
(+)
Alarm Output Negative (-)
4.1 Solid State Relays
5.0
Minimum load of 75
pH
CONTROLLER OPERATION
mA.
The basic controller allows an operator to monitor and control
either the
pH
or millivolts of a solution, slurry or aqueous mixture
by using pumps, solenoids, or relays with suitable reagents. The
determination of the High and Low control set points in the
pH
mode and the calibration of the analog
buffers, i.e.,
the
pH/mV
pH
4.00, 7.00, 10.00, insure correct application of
controller.
-6-
meter using standard
pH
8.0
8.1
RECORDER CALIBRATION -Single Probe
The recorder monitors the
pH/mV
continuous basis with one roll of chart paper. Check the
agreement between the analog meter and the recorder
pen by adjusting the recorder zero (similar to
recorder gain (similar to slope adjust on
Note: These adjsutments of the recorder response may
also be done during
pH
calibration of the analog meter.
This completes recorder calibration for the single probe
with recorder model
-
Calibration of Recorder
Turn function switch to
a.
b.
Place Exp-Norm switch in the Norm (Normal) mode.
Controller
pH
mode.
c. Set the Temperature compensation switch to the buffer
temperature.
pH
d.
Place
pH
probe in
7.00 buffer.
e. Adjust analog meter pointer to
Set knob.
pH
Adjust recorder pen to
f.
7.00 using recorder Zero Set
knob.
g. Rinse probe with deionized or distilled water.
pH
h.
Place probe in
i.
Adjust analog meter pointer to
4.00 buffer.
Slope knob.
pH
j.
Adjust recorder pen to
4.00 using recorder Gain
knob.
k.
Rinse probe.
I.
Check calibration and probe linearity by using
buffer. The analog meter pointer and recorder pen should
both read
10.00+0.10
pH
units. Rinse probe.
--
11
This completes the High and Low
example, the High limit is set at
pH
pH
8.00. As long as the
of the monitored solution remains
setpoint
pH
9.50 and the Low limit is set at
adjustments. In this
within these limits, the controller will not be activated. If the
pH
falls below
pH
8.00 or rises above
9.50, then the controller will
activate and apply current to the appropriate output terminals. If
the
pH
remains outside these limits for longer then the preset
Time Delay (TD) interval (10 minutes max.), then the alarm light
will start flashing, provide a pulsed
3.5V
,pp,
20mA current to the
alarm output terminals and disconnect the power to the output
terminals.
6.8
Note: Appropriate controller set points for
mV Control Set-Up
mV
are adjusted
in either the expanded or normal mode. These adjustments
are made similarly to
knob, the analog meter can be offset
7.0
CALIBRATION OF THE ANALOG
a.
Function switch must be in the
b.
Exp-Norm switch in the Norm (normal) mode.
c. Standard
pH
set points. With the set control
+ 1800
pH
4.00, 7.00, and 10.00 buffers are
pH
pH
mode.
mV.
METER
suggested for calibration purposes.
pH
pH
d.
Place
electrode in
e. Adjust analog meter to
f.
Rinse probe with deionized or distilled water.
g. Place probe in
h.
Adjust analog meter to
pH
4.00 buffer.
7.00 buffer.
pH
7.00 using the Set knob.
pH
4.00 using Slope
adjustment.
i.
Rinse probe.
-lO-
pH
6.0
6.1
6.2
6.3
CONTROL SETUP
-
Bench Models
a.
Connect controller to AC power.
b.
Connect solenoids, pumps, or relays to appropriate outlet
Device Setup
(HI/Low) on the back of controller.
c. Test external devices using the
the
Man
mode, power is available to activate the external
devices, solenoids, etc.. Note: for controller operation, the
switch must be in the
d. Connect
pH
or ORP/REDOX electrode to appropriate
Auto
mode.
input.
-
NEMA Models
Device Setup
This is an electrical setup and should be done by a
qualified person.
a.
Install controller using appropriate mounting holes in
the NEMA case. Allow sufficient space to open front cover.
b.
Carefully connect main input power to pins
and grounding hex nut (ground).
c. Connect High control device leads to pins
#5 is a ground.
d. Connect Low
Pin
#8
is a ground.
ocontrol
e. Connect alarm to pins
and pin
#I2
is negative. Alarm is pulsed 3.5 VDC,
device leads to pins
#I
1 and
20mA output.
pH
f.
Connect
electrode(s) to BNC connector(s) on right
side of NEMA case. NOTE: The upper input on the Dual
Probe unit is marked recorder
marked controller
pH
input.
the recorder.
-
Front Panel Preset
a.
Set
manual temperature
Bench Models
(Tempo)
temperature of monitoring solution
b.
Norm-Exp is set to
c. Set High limit at
d. set Low limit at
e. Set
mV-Stby-pH to
Norm
pH
14.00 (full clockwise).
pH
0 (full clockwise).
pH
(Normal).
mode.
f. Adjust both High and Low Time Delays (TD) to a maximum
time delay of 10 minutes (full clockwise).
h.
Turn power switch ON.
_7_
6.4
6.5
6.6
-
Front Panel Preset
a. Set
manual temperature
temperature of monitoring solution
NEMA Models
(Tempo)
(pH
compensation to the
only).
b. Dual probe models only: Adjust manual temperature
compensation for recorder
pH
probe.
c. Set Exp-Norm to Norm (Normal).
d. Set High limit at
e. Set Low limit at
f. Set
mV-Stby-pH to
pH
14.00 (full clockwise).
pH
0 (full clockwise).
pH
mode.
g. Adjust both High and Low Time Delays (TD) to a
maximum time delay of 10 minutes (full clockwise).
h. Turn power switch ON.
High Limit Set-Up
a. Manually adjust analog meter pointer to desired high
pH
control limit using the SET control knob. i.e.
9.50.
b. Turn High control knob counterclockwise until the
High LED lights up.
(pH
c.
Check limit
9.50) by slowly turning Set control
to move the analog meter pointer (indicator) back and
forth through the desired High
pH
limit. At a
pH
value
just under the High limit, the High LED will remain off.
As the pointer reaches
pH
9.50 or greater, the High LED
will activate, indicating that power is available to the High
control output terminal.
Low Limit Set Up
a.
Manually adjust analog meter pointer to desired set point
pH
using the SET control knob. i.e.
b.
Turn Low control set knob counterclockwise until the
8.00.
Low LED lights up.
c. Check set point
(pH
8.00) by slowly turning Set control
to move the analog meter pointer (indicator) back and forth
through the desired Low
pH
set point. At a
pH
value
just under the Low set point, the Low LED will remain off.
As the pointer reaches
pH
8.00 or less, the Low LED
will activate, indicating that power is available to the Low
controller output terminal.
d.
Slight adjustment of Low Control set may be necessary
to define a certain
pH
or set point.
6.7
Time Delay Set-Up
a.
Adjust High or Low Time Delay (TD) while the appropri
ate LED is activated. Note: Time Delay intervals can be set
for a maximum (clockwise) 10 minutes and a minimum
(counterclockwise) less than 20 seconds.
b.
Turn Time Delay (TD) to a minimum (counterclockwise).
c. Alarm LED will
indicating that the Set Point
activate and flash intermittently
has been exceeded for
longer than the Time Delay (TD) will allow (less than
20 seconds).
d.
With the flashing alarm LED activated, output current to
the pump, solenoid or relay will be terminated and warn
operator of out of range condition, a possible
probe malfunction, or insufficient addition of neutralizing
solution.
This Time Delay (TD) safety feature prevents over
addition of neutralizing solutions. It is reactivated
automatically when the
pH
is returned to below the set
point.
e. Adjust Time Delay (TD) to maximum (clockwise) or some
IO
minutes).
-
intermediate interval (0
This safety feature insures against excess neutralization even if
the
pH
electrode is broken or disabled or a controlled neutralizing
pump, solenoid, or valve malfunctions.
-a-
-9-
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