NOVUS TxIsoRail 4-20 mA - Manual (Page 3)

NOVUS AUTOMATION 3/3
OPERATION
All input types and the 4-20 mA output current are factory calibrated.
However, if desired by the user, a manual offset trim is implemented to
provide fine adjustments to the signal in the field. This is accomplished by
the front key ZERO, located under the frontal label in order to avoid
accidental adjustments. Using a small tool (2 mm diameter), press and hold
the desired key for at least 2 seconds to increase or decrease the output
current. When the output current is reached, the key must be released.
The offset correction can also be accomplished by the TxConfig software.
See in Figure 3 the Zero Correction field for this purpose. The serial
adaptor can be connected to the transmitter while it is operating in the
process.
The user must choose the sensor and configure the sensor span which best
suit the application. The sensor span must not exceed the maximum range
supported by the transmitter for a particular sensor, neither be lower than the
minimum span.
It is important to note that the transmitter accuracy is related to the total
sensor span of a sensor, regardless of the output scale (span) configured.
Example:
• Pt100; maximum input span of –200 to +650 °C, 0.2 % accuracy.
• Maximum error: 1.2 °C (0.15 % of 800 °C)
• This error is the same no matter if total span is used (-200 to 650 °C)
or a narrower user-defined span is used, like 0 to 100 °C.
Note: When using a Pt100 simulator, make sure the transmitter Pt100
excitation current (0.18 mA) is compatible with the simulator specification.
SAFETY INFORMATION
Any control system design should take into account that any part of the
system has the potential to fail. This product is not a protection or safety
device and its alarms are not intended to protect against product failures.
Independent safety devices should be always provided if personnel or
property are at risk.
Product performance and specifications may be affected by its environment
and installation. It’s user’s responsibility to assure proper grounding,
shielding, cable routing and electrical noise filtering, in accordance with local
regulations, EMC standards and good installation practices.
SUPPORT AND MAINTENANCE
This product contains no serviceable parts inside. Contact our local
distributor in case you need authorized service. For troubleshooting, visit our
FAQ at www.novusautomation.com .
LIMITED WARRANTY AND LIMITATION OF LIABILITY
NOVUS warrants to the original purchaser that this product is free from
defects in material and workmanship under normal use and service within
one (1) year from the date of shipment from factory or from its official sales
channel to the original purchaser.
NOVUS liability under this warranty shall not in any case exceed the cost of
correcting defects in the product or of supplying replacement product as
herein provided and upon the expiration of the warranty period all such
liability shall terminate.
For complete information on warranty and liability limitations, check
appropriate section in our web site: www.novusautomation.com .