This PID controller has a built-in timer. It is suitable for processes that require both precise temperature and time control, a very common requirement for many temperature related applications. For example, it can be used for powder coating ovens or ovens for cooking food. Heat transfer printing is another example. The timer can also be used independently from the temperature control. e.g. user can use the PID for temperature control of the espresso machine and timer for the brew pump or dosing coffee grinder.
The temperature control function offers three temperature control modes: PID, on/off and manual. The PID mode is useful for precision temperature control applications. The manual mode is like a dial on the stove that controls the power output independent of the temperature. It is a useful feature for controlling the boiling of water used for beer brewing process. The on/off control is suitable for devices that are not conducive to being switched too frequently such a solenoid valve or refrigerator compressor. In addition to the on/off control, when used for cooling control, this controller also offers the "Anti-Short Cycle Delay (ASd) function that further protects the compressor from over pressure start. It allows the user to set a specific minimum delay time that prohibit the compressor from starting after being turned off.
This timer has eight different working modes:
Three of them are related with the temperature control. The first two start the timer when temperature reaches the set point. When time is reached, it will turn on the alarm relay. One mode will also shut off the heater at the same time. In the third mode, the timer starts after the temperature reaches set point. When set time reaches, it will shut off the heater. Relay pulls in when timer starts and drops out when it reaches the set time.
The other 5 modes allow the timer to work totally independent of the temperature controller. It can be set to time delayed relay pull-in, time delayed relay drop-out, time delayed relay pull-in and drop out, repeat pull-in and drop-out, or repeat drop-out and pull-in.
The timer can be reset and start by a switch connected to the reset terminals without powering off the controller. The timer function can also be deactivated so that controller functions as regular 1/16 DIN dual display controller. When alarm relay is not used for timer action, it can be used as temperature alarm.
SWA-2451B has a pulsed DC output for controlling the external SSR. To drive external mechanical relay/contactor, please see SWA-2441A.
SWA-2451B has two additional alarm relay outputs, compared to its previous model (SWA-2441/2451 only has one alarm output). User can use alarm relay 1 as timer output alarm or temperature alarm, and alarm relay 2 as temperature alarm. One example is, when temperature is too high, high temperature alarm (relay 2) will be triggered. When time is up, timer alarm (relay 1) is triggered.
Click here to download instruction manual for SWA-2451B.
Note 1: For carlin burner customers, this controller (SWA-2451B) is NOT compatible. Please use SWA-2441B instead.
Note 2: This model (SWA-2451B) replaced the previous SWA-2451 and SWA-2451A.
Main Specification
| Input type |
Thermocouple: K, E, J, T, S. RTD: Pt100, |
| Input range |
K (-20 ~ 2300ºF), S (-20 ~ 2900ºF), T (-190 ~ 750ºF), E (-20 ~ 1290ºF),
J (32 ~ 1800ºF), Pt100 (-200 ~ 1100ºF) |
| Display |
Two lines, Four digits. Temp & Time, or Temp & Set Temp. |
| Display Resolution |
Temp 1°C, °F and 0.1°C. °F, Time: 1 Sec., 1 Min. |
| Accuracy |
Temperature: ±0.5% of full input range. Timer: 1 sec. |
| Control mode |
Temperature: PID, Manual control, On-Off,
Time: Timed PID, Timed On-Off, Independent Timer |
| Timer mode |
Single delay, Double delay, Count up, Count down, |
| Timer range |
1-9999 sec. 1-9999 min. |
| Control Output |
12VDC, 50 mA |
| Alarm |
Timer, Process high/low alarm, deviation high/low alarm |
| Alarm output |
Relay: 5A at 240V AC, 10A at 120V AC, or 3A at 30V DC |
Power supply
voltage rating |
90 ~ 265V AC/50 ~ 60Hz |
| Dimension |
1.89 x 1.89 x 4.25", or 48 x 48 x108mm (1/16 DIN).
Insertion depth from front panel: 3.95" or 100 mm |
| Panel cutout |
1.75 x 1.75" or 44.5 x 44.5 mm |
Tutorial Video for SWA-2451 (SSR output variation)
This product was added to our catalog on Tuesday 15 January, 2019.
