Ag/AgCI, double junction reference, general purpose (supplied as standard)
Ag/AgCI, double junction reference, green glass (for high pH applications)
Ag/AgCI double junction reference, micro diameter 4.3mm
Ag/AgCI flat end, Teflon junction* (for plates, shallow solution depth)
Ag/AgCI sleeve style Teflon junction* (for high electrode flow rate application)
GLpH - automated pH measurement
Please note: As of 2009 we have discontinued production of new GLpH systems.
This does not effect our commitment to supporting existing GLpH users or the availability of spare parts and service for existing Sirius customers.
If you have a need for automated pH measurement then contact us to discuss your requirements.
Overview
For accurate and automated measurement of pH in a wide range of samples
- High degree of accuracy
- Easy to use
- Automatic calibration and reminders
- Available in single or autosampler versions
- One-button operation for most measurements
- Built-in GLP
- 'Normal' and 'Supervisor' access modes
GLpH automates all the actions of pH measurement to create the world's most accurate pH meter. The electrode, stirrer and temperature probe are moved automatically between calibration buffer solutions, three wash solutions and the sample. All the errors associated with manual pH measurement are eliminated. The accuracy and repeatability are outstanding.
Sirius GLpH is used in Quality Control laboratories and process monitoring from petrochemicals to personal care. GLP protocols are built-in. Calibration can be pre-programmed to take place at user-defined intervals, so GLpH is always calibrated and ready to go.
GLpH video
This video shows a single sample version of GLpH measuring the pH of a sample of Honey. In the video you can see the washing steps that clean the electrode automatically before and after the pH measurement, and you can also see the collection of the pH point by real-time recording of the electrode stability. When dealing with a viscous sample, the instrument waits after exiting the sample to allow drips to fall from the electrode before moving.
Technical specification
pH electrodes
Electrode fill sol.
Standard Sirius fill solution (*Teflon junctions require gel filling solution)
Electrode storage /calibration
Two positions for each buffer solution, one wash and one calibration
Single sample version
Sample placed in position by hand
Temp. probe
PT100 allows automatic temperature compensation
Probe movement
Fully automated X-Z axis
Resolution of displayed data
0.1, 0.01, 0.001 pH units (selectable)
Calibration
pH7 (or 6.86) buffer, then pH4 and/or pH10 (or 9.18); Buffers traceable to BS, DIN or NIST
Washes
Two water washes and one special wash station provided
Storage position
One (pH7 Buffer solution)
Contamination prevention
Probe assembly never travels over unmeasured samples
Measurement methods
20 available: in automated operation it is possible to interrupt methods to introduce 'rush' samples
Stirrer
Overhead, variable speed
Autosampler version tray
Holds 32 (33mm diameter, plastic) or 50 (25mm glass) sample vials, option to be temperature controlled with external circulating bath.
Keypad
Liquid-crystal 16-line display for text and graphics, 22-buttons for numeric data entry
Keyboard
Mini keyboard for alphanumeric data entry, standard on Autosampler but optional in Single Sample
pH-range
0-14 displayed. Accurate between 1.8 and 12.2
Sample container dimensions
Max height 135mm, minimum diameter 25mm (variable if automation disabled)
Data reported
mV, Temperature, pH by time or stability
Automated
For unattended and overnight operation. Data upload. Maintenance prompts.
Services required
One mains power inlet (110 or 240 V)
Connection to the PC
Cable from GLpH to PC serial comm port
Software
GLpH Firmware Version 2.014
Dimensions of single sample
W570 x D510 x H470mm
Weight
18kg
Dimensions of packaging
W660 x D510 x H320mm
Weight of packed
21kg
Dimensions of Autosampler
W610 x D500 x H570mm
Weight of Auto/s
22kg
Dimensions of packaging
W710 x D600 x H280mm (for the autosample base only)
Weight of packed
25kg (for the autosampler only)
Literature
Electronic copies of our GLpH brochure and technical specifications are available for download:
> GLpH Brochure> GLpH Technical Specifications
New Scientific Paper Published
07.12.09
New paper from Sirius explains how our solubility measurements work, and introduces new methods for evaluating supersaturation.
New Scientific Paper Published
01.07.10
New paper - Study of pH-dependent solubility of organic bases. Revisit of Henderson-Hasselbalch relationship.
Physchem Forum 9, Barcelona
17.09.10
Sirius will exhibit at and sponsor the next Physchem Forum meeting in Barcelona