Flow Calibration - Instrument - Honeywell Impact Series Operating Instructions And Maintenance Manual

4�9�2 Flow Calibration – Instrument
Note:
For Cl
2
and Special Considerations for NH
The following equipment is required:
•
cylinder of calibration gas (either certified individual gas per sensor or a
certified multi-gas mixture)
•
flow adapter: ensure that the tubing is fitted to the port marked 'IN' (except
for Cl cartridges where the tubing should be fitted to the port marked
2
'OUT').
•
flowmeter/regulator set to 300 ml/min
•
tubing
Flow Regulator
Pressure Gauge
Gas Cylinder
Put the instrument into calibration mode by using the menu. If so configured it will
be necessary to enter a password before access to calibration is possible.
Password:
XX . .
Calibration
Zero
Span
Settings
When performing a flammable span gas concentration the instrument will assume
the use of the gas selected. However, after calibration it will revert to the flammable
gas that the instrument is set to measure. No intervention by the user is required.
For Methane or Propane calibrations the following conversion should be used.
If other values are required, adjustment of the calibration point should be carried
out as detailed in Section 4.9.2.2 Span.
Impact / Impact Pro / Impact Pro IR Operating Instructions
and NH sensors, see Section 8 Special Considerations for Cl
3
The keys must be pressed in the correct sequence,
otherwise the password will be rejected. As each key is
entered the '.' will be replaced by 'X'.
The calibration procedure requires a zero, followed by a
span. The span requires specific concentration of
calibration gas that matches those held in the settings.
Select the required option.
EN50054 100% LEL Methane = 5.0% v/v
EN50054 100% LEL Propane = 2.0% v/v
EN61779 100% LEL Methane = 4.4% v/v
EN61779 100% LEL Propane = 1.7% v/v
for more information,
3
On/Off Valve
Gas Tube
Flow Adapter
2
41