Jenway 3540 - Manual (Page 4)

Section 1
Introduction
1.1 Instrument Description
The model 3540 pH/conductivity meter is a dual channel, dual readout instrument that
displays both pH and conductivity values simultaneously. The model 3540 is designed to
show both readings in real time and eliminates cross channel interference, as well as the
need to either switch manually or automatically between measurements. The design also
enables both dual channel and independent single channel operation. Predictive Selection
simplifies operation by taking you directly to the screen relevant to your current task.
The unit enables pH measurements to be made with a 1, 2 or 3 decimal place resolution
against a 1, 2 or 3 point calibration. Automatic calibration can be carried out against standard
NIST, DIN, JIS or Jenway buffers. Alternative values can be entered and stored for semi-
automatic operation. The pH channel can also display Absolute and Relative mV values to
0.1mV resolution, enabling Redox/ORP and simple ISE measurement to be made.
The conductivity channel is auto ranging from 0.01µS up to 19.99S (with x10 probe). This
eliminates the need for manual range selection across this wide measuring range. Reference
temperatures of 18, 20 and 25°C are offered, along with a temperature coefficient that can be
varied from 0% (off) up to 4% per degree Celsius. Three calibration methods can be
employed: automatic recognition of common conductivity calibration standards, semi-
automatic calibration against manually entered values within the measuring range or, a
simple calibration against the quoted cell constant (K factor) for the probe being used. The
conductivity channel can also be set to readout in Resistivity, Salinity or TDS values.
Configuring the instrument to your ideal options is easily achieved using the clear and simple
set up menus. Once entered, these options can be locked against inadvertent change by
entering a Supervisor Security Code.
Access to Set Up menus blocked by incorrect security code entry
GLP functions include user and sample batch identity, calibration reminder, security set up
and date/time stamping of results.
Data logging and alarm functions are also included. Results can be stored to the internal
memory (250 pH and 250 conductivity readings) or output via the RS232 serial port to a
printer or computer. This storage or output function can be triggered manually by pressing
the Store key, or be set on a timed basis. It can also be triggered when a sample reading
reaches stability, or on the activation and reset of any alarm level.
The model 3540 has a high specification and a comprehensive range of features and
functions. Please read through this manual before installation. Refer to it frequently to ensure
you are making full use of all the functions.