# Temperature Controller, CN740 Series, 1/16 DIN, Relay Output, RS485 Communications, 250 VAC

![Product image](https://novapart.co/image/farnell:3410273/)

**URL**: https://novapart.co/products/CN743/temperature-controller-cn740-series-1-16-din-relay
**SKU**: CN743
**Manufacturer**: OMEGA
**Category**: Automation & Process Control || Temperature Controllers
**Price**: €189.9200
**Stock**: 10+
**Lead Time**: 288 days (indicative)

## Description

Available until stocks are exhausted

## Specifications

| Parameter | Value |
|---|---|
| Svhc | Lead (04-Feb-2026) |
| Product Range | CN740 |
| Thermocouple Type | B, E, J, K, L, N, R, S, T, U, Pt100 |
| Output Voltage Max | 250VAC |
| Output Voltage Min | - |
| Temperature Accuracy ± | 0.25% |
| Operating Temperature Max | 50°C |
| Operating Temperature Min | 0°C |

## Datasheet

📄 [Download PDF](https://novapart.co/datasheet/farnell:3410273/)

**P** 

## **1 ⁄16 DIN Temperature Controllers** 

## **CN740 Series** 

**CN743** 

## U **Dual Display** U **Autotune** 

## U **RS485 Communications** 

U **Free Software** 

U **Alarm Functions** U **Thermocouple/ RTD Inputs** U **Output Status** 

The CN740 Series temperature controllers offer accurate temperature measurement and control in a 1 ⁄16 dIN package. designed for direct or reverse acting (cooling or heating) control, the CN740 Series can be programmed for simple oN/ oFF or more complex PId control functions. PId control is supported with manual or autotuning. Select relay, dC pulse or current output for control methods. The CN740 Series accepts a variety of thermocouple and RTd inputs. Process value and set-point value are displayed simultaneously on the large dual LEd. Auto-tuning, engineering units (°F or °C), and alarm status is also indicated on the faceplate. Two alarm outputs are included on the unit with 12 preprogrammed alarm functions. 

## **Specifications** 

**Inputs:** Thermocouple, RTd, see chart **Display:** Two 4-digit, 7 segment 6.35 mm H (0.25") LEds 

**PV:** Red 

**SV:** Green 

**Accuracy:** ±0.25% span, ±1 least significant digit **Supply Voltage:** 100 to 240 Vac, 50/60 Hz **Power Consumption:** 5 VA max **Operating Temperature:** 0 to 50°C (32 to 122°F) **Memory Backup:** Nonvolatile memory **Control Output Ratings:** 

- **Relay:** SPST, 

- 5A @ 250 Vac resistive 

- **Voltage Pulse:** 14 Vdc, 10 to -20% (max 40 mA) 

- **Current:** 4 to 20 mA 

**Communication:** RS485 ModbuS[®] communication protocol **Panel Cut-Out:** 45 mm[2] (1.77 in[2] ) **Front Bezel:** 48 mm[2] (1.89 in[2] ) **Maximum Panel Thickness:** 9.50 mm (0.375") **Panel Depth:** 80 mm (3.15") **Weight:** 114 g (4 oz) **Front Panel Rating:** IP66 

~~ee~~ **Input Types Range** 100 to 1800°C (212 to 3272°F) ~~ee =~~ 0 to 1700°C (32 to 3092°F) ~~eS ee 5 es~~ 0 to 1700°C (32 to 3092°F) -200 to 1300°C (-328 to 2372°F) ~~ee~~ 0 to 600°C (32 to 1112°F) ~~ee =~~ -20 to 400°C (-4 to 752°F) ~~oT~~ -200 to 400°C (-328 to 752°F) -20 to 400°C (-4 to 752°F) ~~aee~~ -100 to 850°C (-148 to 1562°F) -200 to 1300°C (-328 to 2372°F) ~~PK~~ -200 to 500°C (-328 to 932°F) ~~esMs~~ -200 to 500°C (-328 to 932°F) U -200 to 800°C (-328 to 1472°F) ~~PU~~ 0 to 100°C (32 to 212°F) Pt100Ω RTd -20 to 500°C (-4 to 932°F) -200 to 600°C (-328 to 1112°F) 

|**To Order****_Visit omega.com/cn740_series for Pricing and Details_**|**To Order****_Visit omega.com/cn740_series for Pricing and Details_**|
|---|---|
|**Model No.**|**Description**|
|**CN743**|Relay output, with RS485 communications*****|
|**CN742**|Relay output, with RS485 communications<br>dC pulse output, with RS485 communications*****|
|**CN745**|dC pulse output, with RS485 communications<br>4 to 20 mA output, with RS485 communications*****|



## **Accessories (Field Installable)** 

**Model No. Description CNQUENCHARC** Noise suppression RC snubber (2 leads), 110 to 230 Vac **CN7-485-USB-1** RS485 to uSb mini-node converter 

_***** Free_ _**CN7-A** software download available at_ _**omega.com**_ **/** _**cn740_series** Comes complete with operator’s manual._ 

_**Ordering Example: CN743,** single output controller, mechanical relay, RS485 communications._ 

**P-48** 



## Links

- [View this product on Novapart](https://novapart.co/products/CN743/temperature-controller-cn740-series-1-16-din-relay)
- [Request a quote for this part](https://novapart.co/quote/)
- [Supplier page](https://es.farnell.com/omega/cn743/1-16din-temp-controller-relay/dp/3410273)
---

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