EUTECH INSTRUMENTS PC 700 User manual

Instruction Manual
PC 700 pH/mV/Conductivity/ºC/ºF
Bench Meter
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Part of Thermo Fisher Scientific 68X541704 Rev 2 Sep. 2010

TABLE OF CONTENTS
1. INTRODUCTION .............................................................. 1
2. GETTING STARTED........................................................ 2
2.1 Keypad Functions ................................................................... 2
2.2 LCD Annunciators ................................................................... 3
2.3 Meter Connections .................................................................. 3
3. CONDUCTIVITY ELECTRODE ....................................... 4
4. PH AND MV CALIBRATION............................................ 4
4.1 pH Calibration ......................................................................... 4
4.2 Millivolt (mV) Offset Adjustment .............................................. 6
5. CONDUCTIVITY AND TDS CALIBRATION.................... 6
5.1 Automatic or Manual Calibration ............................................. 6
5.2 Single or Multi-Point Calibration .............................................. 7
5.3 General Calibration Tips ......................................................... 8
5.4 Automatic Conductivity Calibration Procedure ........................ 8
5.5 Manual Conductivity & TDS Calibration Procedure................. 9
5.6 Temperature Calibration ......................................................... 9
6. CONDUCTIVITY AND TDS MEASUREMENT ................ 10
6.1 Taking Measurements............................................................. 10
6.2 Automatic and Manual Ranging .............................................. 10
7. HOLD FUNCTION ............................................................ 11
8. STORING AND RECALLING DATA ............................... 11
9. SETUP FUNCTIONS........................................................ 12
9.1 1.0 CAL (Calibration)...............................................................12
9.2 2.0 ELE (Electrode Information) .............................................. 12
9.3 3.0 ConF (Configuration).........................................................13
9.4 3.1 rdY (Ready / Stability Indicator)......................................... 13
9.5 3.2 ºC ºF (Celsius or Fahrenheit) ............................................ 13
9.6 3.3 buFF (pH Buffers & Calibration Points)—pH only ............. 13

9.7 3.3 AtC (Auto Temp Compensation)—Con & TDS only .......... 13
9.8 3.4 tdS (TDS factor)—Con & TDS only ................................... 14
9.9 3.5 t.CO (Temperature Coefficient)—Con & TDS only............ 14
9.10 3.6 t.nr (Normalization Temperature in ºC)—Con & TDS only 14
9.11 3.7 ACAL (Auto Conductivity Calibration)—Con & TDS only .. 15
9.12 3.8 SPC (Single Point Calibration)—Con & TDS only ............. 15
9.13 3.9 CELL (Nominal Cell Constant)—Con & TDS only ............. 15
9.14 4.0 rSt (Reset)......................................................................... 16
9.15 5.0 CLr (Clear Memory) .......................................................... 16
10. CALCULATING TDS CONVERSION FACTOR .............. 17
11. CALCULATING TEMPERATURE COEFFICIENTS........ 18
12. REPLACEMENTS AND ACCESSORIES........................ 19
13. TROUBLESHOOTING GUIDE......................................... 20
14. SPECIFICATIONS............................................................ 22
15. WARRANTY..................................................................... 24
16. RETURN OF ITEMS......................................................... 25

1
1. INTRODUCTION
Thank you for purchasing our PC 700 series benchtop meter.
This microprocessor-based meter is economical and simple to
use. The design incorporates a large LCD for clear viewing, yet
offers a small footprint to conserve space.
The PC 700 measures pH, mV (ORP), conductivity, or TDS
simultaneously with temperature (ºC or ºF).
Each meter includes a convenient slide-out card for quick
reference. Also included is an electrode arm and metal bracket
which can be easily attached to the left or right side of the meter
according to your preference.
The PC 700 benchtop meter replaces our popular pH/CON 510
series meter that was introduced in 2000.
We take great pride in every instrument we manufacture
and hope this one serves you well.

2. GETTING STARTED
2.1 Keypad Functions
Powers the meter on and off. Upon power on, the meter
automatically begins in the mode that was last used.
Calibration and memory values are retained even if meter
is unplugged.
Toggle between available measurement modes—
pH/Temp, mV/Temp, Conductivity/Temp, or TDS/Temp.
Also used to switch to Temperature calibration during pH,
mV, Conductivity or TDS calibration modes.
Press and hold for 5 seconds to enter SETUP mode.
Toggles between measurement and calibration modes.
In SETUP mode, returns user to the measurement mode.
Confirms calibration values in CAL mode.
Confirms selections in SETUP mode.
Changes Con/TDS range and resolution in MEAS mode.
View recalled values in memory mode.
MI (Memory Insert) stores values into memory.
SIncrease value. Scroll up in SETUP & CAL modes.
MR (Memory Recall) recalls values from memory
TDecrease value. Scroll down in SETUP & CAL modes.
Freezes measured reading. Press again to resume
live reading.
2

2.2 LCD Annunciators
2.3 Meter Connections
DC Power supply
CON/
TEMP 8-pin DIN connection for 2-cell Con/TDS/Temp electrode
pH BNC connection for pH, or ORP (Redox) electrode
3

3. CONDUCTIVITY ELECTRODE
The PC 700 includes an electrode with a nominal cell constant of k
= 1.0, built-in temperature sensor, and 1 meter cable. The Ultem
body housing has good chemical resistant properties. The
electrode design offers fast temperature response and reduces air
entrapment, ensuring accurate, repeatable, and stable readings.
The wetted materials of the probe include:
•Polyetherimide (Ultem) – protective probe guard
•Polybutylterphalate (Valox) – sensor housing
•Stainless Steel (SS 304) – 2 bands
The protective probe guard can be removed temporarily for
cleaning however it must be re-attached during measurement and
calibration. Erroneous results will occur while the probe guard
is removed.
Always immerse the probe beyond upper steel band for best
results. Use the fill line on the outside of the probe guard for
reference.
4. PH AND MV CALIBRATION
4.1 pH Calibration
For best results, periodic calibration with known accurate standards i
recommended. Calibrate with standards that bracket your intended
measuring range while including a neutral standard (pH 7.00 or 6.86).
For example, if you expect to measure samples from
c
The PC 700 meter can be calibrated with up to 5 buffers. The
non-vola
s
pH 6.2 to pH 9.5,
alibration with 4.01, 7.00, and 10.01 will work well.
tile memory retains all calibration values upon meter shut
own.d
4

5
wi ard ed;
e buffer group
The follo ng calibration stand s are automatically recogniz
USA buffer group 1.68, 4.01, 7.00, 10.01, 12.45
NI 5ST buffer group 1.68, 4.01, 6.86, 9.18, 12.4
See Section 9.6 to change th
1) Press as needed to select pH.
Dip the pH and ATC electrodes into pH buffer and press
2) . The
secondary display will lock on the appropriate buffer value. Provide
ing for best results. When the READY indicator appears, prestirr ss
to accept. The primary reading will flash briefly before the
secondary display begins scrolling the remaining available buffers.
Rinse the pH and ATC electrodes then dip into the next pH buffe
The secondary display will lock on the appro ate buffer value.
When the READY indicator appears, press
3) r.
pri
to accept. The
primary reading will flash briefly then display the percent efficiency
(slope) before the secondary display begins scrolling the remaining
4)
available buffers.
To calibrate another buffer repeat step 3) or press to return to
the measurement mode. Note: The meter will automatically return
to measurement mode upon successful completion of the numbe
specified calibration points. To spec
r of
ify a different number of pH
int (offset) calibration is only allowed with pH 7.00 or
ted during a new calibration,
ca
calibration points see Section 9.6.
IPS: A single poT
pH 6.86 buffers.
When the first calibration value is accep
all prior libration values are erased.
ress
Pat any time to abort calibration and return to measurement
ode.
m

4.2 Millivolt (mV) Offset Adjustment
Oxidization Reduction Potential (ORP or Redox) is not a precise
measurement, but is useful as a relative indicator. As such, mV offset
adjustment is not meant to enhance accuracy, but rather to make
readings comparable to a reference. Commercial ORP solutions are
often used as a check standard in which a meter/electrode system are
verified to be close to a given value, instead of being used as a
calibration standard in which adjustments are made in an attempt to
match the ORP value.
1) Connect an ORP electrode and press as needed to select mV
(or R.mV).
2) Dip the ORP electrode into a solution with a known mV value
(i.e. Zobel, Light’s, quinhydrone, or iodidetriiodide) and stir.
3) Press when the reading is stable. The primary display shows
the relative millivolt value (R.mV) while the secondary display shows
the factory default mV value.
4) Adjust the R.mV value using or . Press to accept or
to cancel. The meter allows an adjustable maximum value of ±
150 mV from the factory default mV value.
Note: When an offset has been stored successfully, R.mV replaces
mV.
5. CONDUCTIVITY AND TDS CALIBRATION
5.1 Automatic or Manual Calibration
The PC 700 is capable of automatic or manual calibration for
conductivity, and manual calibration for TDS.
In the automatic calibration mode, the meter will automatically select
one of (4) conductivity calibration standard values depending on the
range and normalization temperature being used (TABLE 1).
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