Flow Rate; Calibration Gas - Hach ORBISPHERE G1100 User Manual

Installation

3.9.3 Flow rate

The flow rate is dependant on the water pressure in the sample flow line. The following graph
illustrates the expected flow rate through the flow chamber after installation:
The accuracy of the system does not depend on the flow rate, however a slow flow rate will give
a slower response to the effective changes happening in the process. It is recommended to use
a flow rate of around 100 mL/min. to have a fast response time to process change.
Note: The effective response time will also be strongly dependant on the distance between the process and
the instrument itself.

3.9.4 Calibration gas

38
A bottle of N calibration gas should be connected to
2
the flow chamber as illustrated left.
Connect the bottle to the calibration gas inlet socket (6)
with plastic tubing. Use the supplied pressure reducer
(part number 33015) on the calibration bottle.
Fully open the valve on the pressure reducer. Doing
this will give the required calibration gas flow rate of 0.1
L/min.
The bottle itself is not supplied and must be purchased
locally. For accurate calibrations, the calibration gas
bottles must be of 99.999% (50) quality or better, with a
5/8-18 UNF (C10) fitting. A minimum of 20 liters is
required (34 is recommended), with a maximum of 70
bars.