Section 4 — MAINTENANCE & SERVICE
4–3
Erratic operation
(Target known to be at stable
temperature)
SYMPTOM
POSSIBLE CAUSE/RECOMMENDED ACTION
1.
Check for loose, intermittent connections.
2.
Ensure MODLlNE 4 case is properly grounded.
3.
Ensure loop is grounded at one point.
4.
Use shielded cable that has shield returned to earth ground.
5.
Separate system wiring from power or r-f wiring.
6.
Use a “clean” instrumentation power line.
7.
Check that the MODLINE 4 is not being operated at temperatures
beyond its case operating temperature range (above maximum or
below minimum):
minimum limit: 32°F (0°C) for all models*
maximum limit: 150°F (66°C) for Series 43* through 48, or 130°F
(54°C) for Series 22, in standard enclosure; 400°F
(204°C) for all series in water cooled enclosure.
8.
Determine if large amounts of smoke or steam are “interfering”
with measurement. If MODLINE 4 has a Peak Picker (Block D of
Model No. = 1), operation in Peaking mode may overcome this
problem.
*Exception: for Series 43, Models 04F, 05F, 02C, and 03C, case operating temperature range is 50 to 113°F (10 to 45°C).
TABLE 4.1 – MODLINE 4 SYSTEM TROUBLESHOOTING (CONTINUED)
4.3 SYSTEM TROUBLESHOOTING
If trouble is encountered in obtaining temperature
readings after installation of the system, consult
Table 4.1. If necessary, call or write for further
assistance. For instrument services, contact
IRCON Technical Services. For applications
assistance, contact IRCON Sales Applications
Engineering.
4.4 CALIBRATION SERVICE
The MODLINE 4 is calibrated against precision
laboratory standards and “burned in” for a full
week before shipment to ensure accurate
temperature measurements throughout the
operating range.
To preserve this accuracy, each MODLINE 4
should be recalibrated periodically on a Blackbody
standard. We recommend recalibration of this type
on a yearly basis.
You can have your MODLINE 4 calibrated in our
Pyrometer Service Center. Calibration traceable to
the National Institute of Standards and Technology
(National Bureau of Standards) is an available
option. If you prefer, IRCON can provide a Model
BCH, BCL or BCN Blackbody Calibration System
that lets you perform your own calibration.
Complete instructions are supplied with the unit.
You can also arrange for an IRCON Field Service
Engineer to train your technicians in calibration
procedures. Call IRCON Technical Services for
details.
Summary of Contents for Modline 4
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