Martini Instruments pH 58 - User Manual

OPERATIONAL GUIDE
• Remove the electrode cap and immerse the
meter in MA9015 storage solution for 2 hours
to activate the electrode.
• Turn the meter on by pressing the ON/OFF
button. All the used segments on the LCD will
be visible for 1 second or as long as the
button is pressed.
• Immerse the electrode in the solution to be
tested. Stir gently and wait for the reading to
stabilize, i.e. the instability indicator (hour-
glass) on the LCD turns off.
• Select the pH or ORP (mV) mode by press-
ing the SET/HOLD button.
• The displayed pH value is automatically com-
pensated for temperature. The ORP (mV)
value will be displayed on the main LCD,
while the temperature will always be dis-
played on the secondary LCD.
• To freeze the display, while in measurement
mode, press and hold the SET/HOLD button.
The “HOLD” message appears on the sec-
ondary display and the reading will be fro-
zen on the LCD. Press any button to return
to the normal measurement mode.
• To turn the meter off, press the ON/OFF
USER MANUAL
pH 58
Pocket-size
pH/ORP/°C/°F Meter
ISTPH58R1 05/05
button. The “OFF” message will appear on
the secondary display. Release the button.
Note:
• Before taking any measurement, make sure
the meter is calibrated (the CAL tag is on).
• After use always turn the meter OFF, rinse
the electrode with water to minimize contami-
nation and store it with a few drops of storage
(MA9015) or pH7 (M10007) solution in the
protective cap.
NEVER USE DISTILLED OR DEIONIZED WA-
TER FOR STORAGE PURPOSE.
CALIBRATION PROCEDURE
The ORP (mV) range is factory calibrated.
Contact the nearest Service Center for
recalibration, if necessary.
For better accuracy, frequent calibration of the
tester is recommended. Calibration is also nec-
essary after electrode replacement, after testing
aggressive chemicals and where extreme ac-
curacy is required.
• Turn the meter on and select the pH mode
with the SET/HOLD button.
• Press and hold the ON/OFF/CAL button until
the “OFF” message on the secondary LCD
is substituted by “CAL”. Release the button.
• The instrument enters the calibration mode
by displaying “pH 7.01 USE” (or “pH 6.86
USE” if the NIST buffer set was selected).
• For a single-point calibration, immerse the
electrode in any buffer, i.e. pH 4.01, 7.01 (or
6.86), 10.01 (or 9.18).
www.milwaukeeinst.com
• The meter activates the automatic buffer rec-
ognition. If no valid buffer is detected, the
meter keeps the USE indication active for 12
seconds, and then replaces it with WRNG,
indicating that the sample being measured is
not a valid buffer. Otherwise, if a valid buffer
is detected, then its value is shown on the
primary display, and REC appears on the
secondary LCD.
• If the pH 7.01 (or pH 6.86) was used, press
the SET button to exit the Calibration mode
and the “OK 1” message will appear on the
display. The first calibration point is stored
and the meter returns to normal measure-
ment mode.
For better accuracy, it is always recom-
mended to perform a 2-point calibration.
• For a two-point calibration, immerse the elec-
trode in pH 7.01 (or pH 6.86) buffer solution.
• After the first point has been accepted, the
meter will then ask for the second buffer and
the message “pH 4.01 USE” will appear.
• Rinse the electrode and immerse it in the
second solution (pH 4.01, 10.01 or 9.18).
• If a valid buffer value is detected, the REC
message is displayed and the meter com-
pletes the calibration procedure. The LCD
shows the accepted value with the “OK 2”
message and the instrument returns to the
normal measurement mode. Otherwise, if no
valid buffer is detected, the meter displays the
WRNG message.

Summary

Operational Guide

Initial Electrode Activation

Activate the electrode by immersing it in MA9015 storage solution for 2 hours.

Powering On and Measurement

Turn on the meter and immerse the electrode in the solution to be tested until the reading stabilizes.

Mode Selection and Display

Select pH or ORP mode using SET/HOLD. pH is auto-compensated; ORP/Temp displayed.

Freezing the Display

Press and hold SET/HOLD to freeze the current reading on the LCD. Press any button to resume.

Powering Off

Press the ON/OFF button to turn off the meter. The 'OFF' message appears on the secondary display.

Calibration Procedure

Starting Calibration

Turn on meter, select pH mode, and press ON/OFF/CAL to enter calibration mode.

Single-Point Calibration

Immerse electrode in a buffer (e.g., pH 7.01). Meter recognizes buffer, displays REC and OK 1.

Two-Point Calibration

After first point, immerse in second buffer (pH 4.01/10.01). Meter displays REC, OK 2, and returns to normal mode.

Setup

Temperature Unit Selection

Enter Setup mode to select temperature units (°C or °F) using SET/HOLD and ON/OFF buttons.

Calibration Buffer Set Selection

In Setup mode, select the desired pH buffer set (e.g., pH 7.01 BUFF) using SET/HOLD and ON/OFF.

Electrode Replacement

Electrode Removal

Remove the protective cap and unscrew the plastic ring to remove the electrode.

Electrode Installation

Install a new MI58P electrode, ensuring gaskets are in place before screwing back the ring.

Battery Replacement

Battery Warning and Replacement

Replace batteries when the low battery symbol appears. Use 4x1.5V batteries (IEC LR44, A76).

Specifications

Measurement Range and Resolution

Details pH, ORP, and temperature ranges, along with measurement resolution.

Accuracy and EMC Deviation

Specifies accuracy for pH, ORP, temperature, and typical EMC deviation values.

Temperature Compensation and Calibration

Information on automatic temperature compensation and pH/ORP calibration.

Probe, Environment, and Power

Details about the probe type, operating environment, battery type, and battery life.

Device Dimensions and Weight

Provides the physical dimensions and weight of the pH/ORP meter.

Overview

1. Function Description
2. Important Technical Specifications
3. Usage Features
4. Maintenance Features

The pH 58 is a pocket-sized meter designed for measuring pH, ORP (Oxidation-Reduction Potential), and temperature. It features a dual-line LCD display, showing the pH or ORP value on the main line and temperature on the secondary line. The device is equipped with automatic temperature compensation for pH readings and a replaceable electrode (MI 58P).

Function Description:

The primary function of the pH 58 is to provide accurate measurements of pH and ORP in various solutions, along with simultaneous temperature readings. The meter supports both single-point and two-point pH calibration, allowing for enhanced accuracy. It also includes an instability indicator (hourglass icon) to signal when readings are stabilizing, and a "HOLD" function to freeze the displayed measurement. The device incorporates a Battery Error Prevention System (BEPS) to prevent erroneous readings due to low battery levels by automatically shutting off the meter when batteries are weak.

Important Technical Specifications:

• Range:
  • pH: -2.00 to 16.00 pH
  • ORP: ±1000 mV
  • Temperature: -5.0 to 60.0°C / 23.0 to 140.0°F
• Resolution:
  • pH: 0.01 pH
  • ORP: 1 mV
  • Temperature: 0.1°C / 0.1°F
• Accuracy (@25°C):
  • pH: ±0.05 pH
  • ORP: ±2 mV
  • Temperature: ±0.5°C / ±1°F
• Typical EMC Deviation:
  • pH: ±0.02 pH
  • ORP: ±2 mV
  • Temperature: ±0.3°C / ±0.6°F
• Temperature Compensation: Automatic for pH, from -5 to 60°C.
• pH Calibration: Automatic, 1 or 2 points, with 2 sets of memorized buffers (pH 4.01, 7.01, 10.01 or 4.01, 6.86, 9.18).
• ORP Calibration: Factory calibrated.
• Probe: Replaceable MI 58P.
• Environment: -5 to 50°C; 100% RH max.
• Battery Type: 4 x 1.5V; IEC LR44, A76.
• Battery Life: Approximately 250 hours of use.
• Auto-Off: After 8 minutes of non-use.
• Dimensions: 200 x dia 38 mm.
• Weight: 100 g.

Usage Features:

• Power On/Off: The meter is turned on by pressing the ON/OFF button. All LCD segments are briefly visible upon startup. To turn off, press the ON/OFF button again; "OFF" will appear on the secondary display.
• Measurement: Immerse the electrode in the solution and stir gently. Wait for the instability indicator (hourglass) to turn off, signifying a stable reading.
• Mode Selection: Press the SET/HOLD button to switch between pH and ORP (mV) modes.
• Temperature Display: Temperature is always displayed on the secondary LCD.
• Hold Function: In measurement mode, press and hold the SET/HOLD button to freeze the display. "HOLD" will appear on the secondary display. Press any button to return to normal measurement.
• Calibration:
  • To enter calibration mode, press and hold the ON/OFF/CAL button until "CAL" appears.
  • The meter automatically recognizes valid pH buffers (pH 4.01, 7.01, 10.01 or pH 4.01, 6.86, 9.18).
  • For single-point calibration, immerse in any valid buffer. If pH 7.01 (or 6.86) is used, press SET to exit, and "OK 1" confirms storage.
  • For two-point calibration, start with pH 7.01 (or 6.86), then rinse and immerse in the second buffer (pH 4.01, 10.01 or 9.18). "OK 2" confirms successful two-point calibration.
  • If an invalid buffer is detected, "WRNG" (wrong) is displayed.
  • To exit calibration mode without saving, press the ON/OFF button; "ESC" will appear.
  • To reset to default values and clear previous calibration data, press the SET/HOLD button after entering calibration mode and before the first point is accepted; "CLR" will appear.
• Setup Mode:
  • Enter setup by pressing the ON/OFF button until "TEMP" and the current temperature unit appear.
  • Use SET/HOLD to switch between °C and °F.
  • Press ON/OFF once to enter buffer set selection ("pH 7.01 BUFF" or "pH 6.86 BUFF" for NIST). Use SET/HOLD to select.
  • Press ON/OFF twice (or once after buffer selection) to return to normal measurement.

Maintenance Features:

• Electrode Activation: Before first use or after prolonged storage, immerse the electrode in MA9015 storage solution for 2 hours.
• Electrode Care: After use, always turn the meter off, rinse the electrode with water, and store it with a few drops of MA9015 storage solution or pH 7 (M10007) solution in the protective cap. Never use distilled or deionized water for storage.
• Electrode Replacement: Unscrew the plastic ring, pull out the old MI58P electrode, and replace it with a new one, ensuring gaskets are in place before re-screwing the ring.
• Battery Replacement: When the battery symbol appears on the LCD, replace the batteries promptly. Unscrew the battery compartment cap, replace the four 1.5V batteries (IEC LR44, A76) observing polarity, and ensure the gasket is in place before re-screwing the cap. Battery replacement should only be done in a non-hazardous area.
• Calibration Frequency: Frequent calibration is recommended for better accuracy, especially after electrode replacement, testing aggressive chemicals, or when extreme accuracy is required. The ORP range is factory calibrated and requires contacting a service center for recalibration if necessary.

Martini Instruments pH 58 Specifications