Special Conditions For Use When Used For Explosion Protection; Special Conditions For Use When Used For Measurement Of Toxic Gases Or Oxygen - Honeywell touchpoint pro Operating Manual

14.3.2 Special Conditions for Use When Used for Explosion Protection

Refer to certificate BVS16 ATEX G 002 X.
When using 4-20 mA transmitters, pay particular attention to the following:
•
- The specifications of the 4-20 mA interface
•
- Behaviour with currents less than 4 mA
•
- Behaviour with currents in excess of 20 mA
For each channel, the alarm with the highest significance for safety shall be configured as Latching.
Time delayed relays should not be used for safety related purposes. If their use is unavoidable, the delay time shall be set to
the minimum possible for the required operation. The maximum possible rate of increase of gas concentration shall be taken
into account when determining the delay time.
A latching Fault Relay shall be associated with each channel using Sensepoint ppm catalytic sensors to achieve a reliable
indication in the event of the sensor being flooded with high gas concentrations. A Master fault relay may be configured
where appropriate, or one or more designated relays configured in the Cause and effect matrix.
All controls, including digital inputs, inputs from webserver and inputs from Modbus shall be protected against unauthorised
or inadvertent interference or operation.
When monitoring flammable gases or vapours, the following configuration limits shall be observed:
•
- The parameter Under Range Fault Limit shall not be set below -10 %FSD.
•
- The parameter Zero Suppression Positive shall not be set above +5 %FSD.
The parameter Over Range Warning Latch shall be set to latching when used with remote sensors or transmitters which
may give indications within their measuring range at gas concentrations above the configured measuring range.
When monitoring oxygen, the following configuration limits shall be observed:
•
The parameter Under Range Fault Limit or the parameter Zero Suppression Negative shall not be set below
-2 %FSD.
•
The parameter Zero Suppression Positive shall not be set above +2 %FSD.

14.3.3 Special Conditions for Use When Used for Measurement of Toxic Gases or Oxygen

Refer to Certificate PFG 16 G 002 X.
When used as EN 45544-2 apparatus, Touchpoint Pro is suitable for use with transmitters where the output at the limit value
is between 4.96 mA and 12 mA.
When using 4-20 mA transmitters, pay particular attention to the following:
•
The specifications of the 4-20 mA interface
•
Behaviour with currents less than 4 mA
•
Behaviour with currents in excess of 20 mA
For each channel, the alarm with the highest significance for safety shall be configured as Latching.
Time delayed relays should not be used for safety related purposes. If their use is unavoidable, the delay time shall be set to
the minimum possible for the required operation. The maximum possible rate of increase of gas concentration shall be taken
into account when determining the delay time.
All controls, including digital inputs, inputs from webserver and inputs from Modbus shall be protected against unauthorised
or inadvertent interference or operation.
When monitoring oxygen, the following configuration limits shall be observed:
•
The parameter Under Range Fault Limit or the parameter Zero Suppression Negative shall not be set below
-2 %FSD.
•
The parameter Zero Suppression Positive shall not be set above +2 %FSD.
When monitoring toxic gases, the following configuration limits shall be observed:
•
The parameter Under Range Fault Limit shall not be set below -10 %FSD.
•
The parameter Zero Suppression Positive shall not be set above the lower limit of measurement when used
according to EN 45544-2.
•
The parameter Zero Suppression Positive should not be set above +5 %FSD when used according to EN 45544-3.
Pt. No. 2400M2566_1_EN
CERTIFICATION
80
Touchpoint Pro
Operating Manual