mULTIMATE CHxx 145 ER & LPR details
Multiplexed Field Unit Transmitter
General informations
The CHxx145 Transmitter monitor corrosion penetration in any environment (solid, liquid or gaseous) using the first Ohm’s Law to relate measured electrical resistance of a Sensing Element to its geometrical variations induced by corrosion (ER probes) & using the electrochemical law of potential deviation.
The transmitters are connected to ER & LPR Probes by suitable Cables and are located near the Probes themselves.
Data can be transferred to the receiver Unit or to a Computer (laptop or notebook IBM compatible) or to a mULTIMATE 141DL or to a MM142ER/LPR/145CM equipment either through a cable RS232 or via an optical, infrared, RS232 Link.
The measurement is carried out timed and memorised in a internal memory.
The rates of measures are re-programmable 0.1-1000 hours.
Data and set-up are retained automatically for a minimum period of 30 Years
A single instrument can be set to measure one (CH0145) or many (CHxx145 multiplexed) ER, LPR, ZRA or POL probes: each Probe can be distinguished by a unique TAG number and measures are memorised in a non-volatile memory with Tag number & Date/time associated.
Operating principle
The CHxx145 Transmitter reads the ratio of electrical resistance between an exposed Sensing Element and a similar, protected Reference Element, which provides thermal compensation for the Probe (ER Probe); CHxx145 reads the electrical resistance of the corroding electrode-electrolyte interface (LPR Probe).
Using the appropriate relationship between electric resistance and geometry of the sensing Element, the ER Transmitter can calculate the variation in cross section of the Sensing Element and thereby the corrosion penetration; hence, knowing the time from the last measure, the rate of corrosion.
For LPR Probes the polarization resistance is measured as the ratio of the applied DC potential to the flowing current and is constant over a small range (<20mV) and is related to corrosion rate.
Specifications
- Software controlled, reprogrammable of the probe readings, upon simple operator commands via a portable PC, or via our mULTIMATE 141DL 142ER/145CM equipment.
- Programmable rate of measure 0.1-1000 Hour.
- Set Point of: Year, Month, Day, Hour, Minute, TAG number (real time clock included).
- Built- in non-volatile memory (30-Years retaining) up to 3000 Reading measures: can remain unattended from uploading recorded measures for up 6 months at the minimum rate (1 hour) or for up 2 Years with a standard rate interval of 8-12 hours.
- Hardware & software compatible with Better Manufacturer’s equipment.
- PC RS232 connectivity Software & cable communication included.
- Enclosure: Galvanised shock-proof IP 65 rated Box.
- Set Mode: Auto (timed measuring with autostore) & full autoranging
· Power Supply: 12 V DC
· Typical Charge Life: 200 days @ 1 reading/hr
- Size: 200x170x80 mm (MMCH01145)
- Weight: 2,5 Kg (excluding cables).
