48VTR English 9/00 Ver. 2.7
11
14. CUSTOMER SERVICE
Extech offers complete repair and calibration services
for all of the products we sell.
For periodic calibration, NIST certification or repair of any Extech product, call customer
service for details on services available. Extech recommends that calibration be
performed on an annual basis to ensure calibration integrity.
15. WARRANTY
EXTECH INSTRUMENTS CORPORATION warrants this instrument to be free of defects
in parts and workmanship for one year from date of shipment (a limited warranty may
apply on sensors and cables). If it should become necessary to return the instrument for
service during or beyond the warranty period, contact the Customer Service Department at
(781) 890-7440 ext. 210 for authorization.
A Return Authorization (RA) number must be
issued before any product is returned to Extech.
The sender is responsible for
shipping charges, freight, insurance and proper packaging to prevent damage in transit.
This warranty does not apply to defects resulting from action of the user such as misuse,
improper wiring, operation outside of specification, improper maintenance or repair, or
unauthorized modification. Extech specifically disclaims any implied warranties or
merchantability or fitness for a specific purpose and will not be liable for any direct,
indirect, incidental or consequential damages. Extech's total liability is limited to repair or
replacement of the product. The warranty set forth above is inclusive and no other
warranty, whether written or oral, is expressed or implied.
Copyright
©
1999 Extech Instruments Corporation. All rights reserved
including the right of reproduction in whole or in part in any form.
APPENDICES
Appendix A: Alarm Mode Selections for parameter 'A1Fu'
'00' Deviation High Alarm:
For the Deviation High Alarm, the value entered for the
"A1SP" parameter equals the amount the controller's HIGH alarm setpoint is offset
from the main controller setpoint. For example, if SV = 400 and A1SP = +10 then
the Limit Alarm relay will trip when the temperature reaches 410
o
. The Deviation
alarm setpoint tracks the main setpoint meaning that it changes as the main
setpoint changes always remaining a programmed number of units from the main
setpoint.
'01' Deviation Low Alarm:
With the Alarm setup as a Deviation Low Alarm, the value
entered for the "A1SP" parameter equals the amount to which the controller's LOW
alarm setpoint is offset from the main controller setpoint. For example, if you
entered SV = 400 and A1SP = -10 then the Alarm relay will trip when the
temperature falls below 390
o
. The Deviation alarm setpoint tracks the main setpoint
meaning that it changes as the main setpoint changes always remaining a
programmed number of units from the main setpoint.
'02' Process High Alarm:
Relay trips when the process (PV) exceeds the value
programmed at A1SP. Process alarms are fixed, absolute values and do not
change as the main control setpoint changes.
'03' Process Low Alarm:
Relay trips when the process (PV) falls below the value
programmed at A1SP. Process alarms are fixed, absolute values and do not
change as the main control setpoint changes.
'04' Deviation High Alarm with Standby Sequence:
Same as the Deviation High
Alarm but no relay action takes place until the process PV reaches the setpoint for
a second time. Also known as "Startup Inhibit" and is useful for avoiding alarm trips
during startup.
'05' Deviation Low Alarm with Standby Sequence:
Same as the Deviation Low Alarm
but no relay action takes place until the process PV reaches the setpoint for a
second time. Also known as "Startup Inhibit" and is useful for avoiding alarm trips
during startup.
