When engineers and instrumentation technicians need reliable portable process calibrators for workshop bench testing or live plant environments, Instrotech’s locally designed and manufactured Calog calibrator range delivers. Built around modern component technology, an intuitive interface and a rugged IP54-rated housing, the Calog series is engineered for the demands of real industrial field calibration work.
All Calog calibrators offer a consistent set of key features:
• Key-per-digit numeric entry: Fast source value setup by scrolling each digit independently up or down without cycling through the full range.
• 128 x 64 backlit LCD display: Switchable between numeric or trending views with programmable timing.
• Data-logging via SD card or USB: Download to a PC and open in spreadsheet software.
• Compact and rugged: 86 x 155 x 43 mm, IP54 rated for dust and splash resistance.
• Lithium-ion battery: Approximately eight hours of run time (measured and sourced combined), with temperature sensing built in.
• Programmable auto-off: Selectable date and time settings.
• Standard accessories included: Battery charger, carry case, non-slip rubber cover and safety leads.
• Two-year guarantee: Against faulty materials and workmanship.
Calog-TEMP: portable temperature calibrator
The Calog-TEMP is a high-precision, multifunctional temperature calibrator that handles the full range of temperature measurement and sourcing tasks in a single handheld device. It measures milliamps, millivolts, thermocouples, ohms and RTDs simultaneously, with temperature channels isolated from the milliamp channel so both can be displayed at the same time.
This makes field and workshop calibration straightforward: inject thermocouple millivolts, or RTD ohms, into a transmitter while reading the milliamp output, all from one instrument. Supported thermocouple types are K, T, B, R, S, E, N, U and L; supported RTD types are Pt50, Pt100, Pt200, Pt500, Pt1000, Ni100 and Ni120.
Cold junction compensation is automatic (internal), or can be set manually or via an external reference. Ohm and RTD measurements support 2-, 3- or 4-wire connections; sourcing is in 2-wire form. The milliamp measurement is selectable between passive and active, with 24 V loop power for 2-wire transmitters. A plug-in extender with spring terminals is included for direct connection to bare thermocouple wires or compensating cables, with cold junction correction integrated into the extender itself. The graphic display can be switched to trend logging mode, making it a useful tool for monitoring ovens or tuning PID controllers.
Calog-LOOP II: portable milliamp loop calibrator
First launched in 2005 as the original Calog product, the Calog-LOOP II is now in its second generation, rebuilt around an ARM processor for improved performance and expanded features including data-logging and SD card storage. This instrument is purpose-built for milliamp loop-powered instrumentation. It measures, sources and simulates 4-20 mA signals with an accuracy of 0,01% full scale for 0-24 mA input range, and 0,005% full scale for 0-32 V inputs.
Sourcing modes include increment, step, ramp and valve stroking, useful for commissioning and fault-finding on control valves and transmitters. DC voltage of 0-32 V and circuit continuity measurement are also included. Display options show milliamps and percent simultaneously. Where loop power is needed, 24 V excitation is available onboard. Trend logging with a programmable time base is available for long-term loop monitoring, with data stored on the SD card and easily exported via USB to a PC spreadsheet.
Portable pressure calibrator
The Calog-PRESSURE II is a second-generation portable pressure calibrator that combines pressure measurement with the full capabilities of a milliamp loop calibrator, making it a single instrument for pressure transmitter calibration, I/P converter testing and general loop maintenance. Pressure sensing uses Keller PA-33x series digital pressure sensors, connected via a Binder connector for easy swap-out.
The calibrator can simultaneously measure pressure and milliamps, or source milliamps while measuring pressure, depending on the task.
• Pressure transmitter calibration: Measure pressure and milliamp output simultaneously.
• I/P converter testing: Source milliamps and measure the resulting pressure.
• Emergency replacement mode: Enable TRACKING so the milliamp output follows the measured pressure, effectively placing the calibrator in-circuit as a temporary pressure transmitter, useful for data-logging or maintaining control during instrument downtime.
It also measures DC voltage, circuit continuity and milliamps, and can source and simulate milliamp signals for loop maintenance work.
Portable load cell tester and calibrator
The Calog-LC II is Instrotech’s most feature-complete portable calibrator, designed specifically for strain gauge load cell testing, diagnostics and calibration. It supports indication and data logging via USB or SD card.
A key benefit of the Calog-LC II is in-situ load cell testing, with no need to remove the load cells. Test each cell and get a diagnostic readout in under ten seconds. The automated test sequence detects whether the wiring is 4-wire or 6-wire (3- or 5-wire results flag a fault condition), verifies all connections are sound, powers up the load cell and measures no-load millivolts for bridge balance, measures resistance through the strain gauge bridge (input, output and balance) in sequence, and performs an insulation test at 50 V to detect water ingress, with low readings highlighted onscreen. If a load cell has been overloaded, the zero balance will be out of specification. Water penetration shows up in the insulation test. The full result is summarised on the backlit graphic display.
| Tel: | +27 10 595 1831 |
| Email: | [email protected] |
| www: | www.instrotech.co.za |
| Articles: | More information and articles about Instrotech |
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