Danfoss 060G1038 AKS 32R Ratiometric Transmitter -1 to 12 bar

AKS 32R: a ratiometric output transmitter for controllers with their own 5 V reference

Danfoss 060G1038 is an AKS 32R. Unlike the current-output AKS 33, this transmitter gives an output that follows its supply voltage: the minimum pressure produces 10 % of the supply and the maximum pressure 90 %. At a 5 V supply the data sheet gives 0.5 V at the bottom of the range and 4.5 V at the top.

That behaviour suits controllers whose analogue-to-digital converters use the same 5 V reference, because supply tolerance cancels out and the reading stays accurate without a precision supply. The data sheet lists A/C, refrigeration, CO2 plant, process control and laboratories as fields of use.

Technical specifications

Practical points for panel builders and OEMs

The range of -1 to 12 bar with a G 3/8 male connection to EN 837 is a common choice for low-side readings in chillers and heat pumps, including those with CO2 or ammonia, since the data sheet states compatibility with all refrigerants. A typical accuracy of 0.3 % and maximum 0.8 % of full scale is notably tighter than the AKS 3000 series.

Wire the four-pin connector according to the pin allocation in the data sheet: supply, common and output. The store page marks pin 3 as the positive output. Do not connect the unit to a 4 to 20 mA input card; use a voltage input that matches the supply.

Approvals and ordering

The store entry lists ATEX Ex ec IIA T4 Gc, CE, UL recognised and GOST. The transmitter is not intrinsically safe. The housing is IP65 and the overload limit is 33 bar.

Check the supply voltage of the receiving controller, the connection thread and the range before ordering. Seven Star LLC is an independent supplier in Muscat and can quote 060G1038 against your enquiry.

During commissioning, measure the supply voltage at the transmitter terminals and divide the output by it; at atmospheric pressure the ratio should sit near the position of zero on the -1 to 12 bar scale. A ratio that drifts with the supply indicates a wiring or reference-voltage fault in the controller, not a transmitter fault, which saves needless replacement. Document the measured ratio in the commissioning record for future comparison.

When you receive 060G1038, compare the code on the label with the order and with this page before installation. Report any difference immediately, keep the original packing for the first days, and store the unit dry and clean until the installation crew is ready to start.

Projects that use 060G1038 often need related parts from the same manufacturer, such as connectors, mounting parts or spare kits. Mention them in the same enquiry so that compatibility can be checked together rather than discovered on site, when a missing part stops the work.

Choosing between ratiometric and current output

The main decision when selecting an AKS 32R is the type of input on the receiving controller. A ratiometric transmitter is the natural partner for a controller that powers the transmitter from the same reference used by its analogue-to-digital converter, because any change in that reference affects the signal and the measurement in the same way. Where the signal has to travel a long distance through an electrically noisy plant, or where the input card expects a current loop, a current-output transmitter such as the AKS 33 is generally the better fit. Confirming the input type first avoids ordering a transmitter that cannot be read by the controller.

The range of this code also matters. A range that starts below atmospheric pressure allows the transmitter to read evacuation and low suction conditions, which is useful on the low-pressure side of refrigeration and heat pump circuits. For higher pressure points in the same plant, a different code from the Danfoss table is needed.

Typical applications

In refrigeration and air conditioning, the AKS 32R is used to measure suction pressure for compressor capacity control, evaporator pressure for superheat control and general system monitoring. In process control and laboratory equipment, it serves where a compact transmitter with a voltage signal is read by a small controller or data acquisition unit. Because it is suitable for CO2 plant and refrigerants in general, one transmitter type can be standardised across several machines.

Installation considerations

Mount the transmitter at a point where it reads the pressure that the control loop actually needs, and avoid locations exposed to strong pulsation or liquid hammer where possible. Tighten the G 3/8 connection with a suitable tool on the hexagon rather than on the housing. Route the signal cable away from power and motor cables, and keep the connector correctly fitted so the enclosure rating is maintained. In hazardous areas, confirm that the Ex marking listed above matches the zone classification of the site, keeping in mind that the transmitter is not intrinsically safe.

Checking the signal during service

When a reading looks wrong, compare the output with the supply actually present at the transmitter rather than with a fixed voltage. Because the output is a share of the supply, a low supply produces a low output even when the transmitter is healthy. Recording both values during routine checks makes faults in wiring or the controller reference easier to separate from a transmitter problem.

How to specify your request for quotation

Quote the Danfoss code number 060G1038, the type AKS 32R and the quantity. Mention the controller or input type the transmitter will feed and the refrigerant or medium, so that the choice of a ratiometric output and this range can be confirmed before the order is placed.

Documents and quotation

The attached AKS 32R / AKS 2050 data sheet AI569727498474 holds the code table and dimensions. Browse similar pressure instrumentation.