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Temperature Controllers

These Controllers receive sensor signals and control heaters or other devices to maintain a preset temperature. They can also be used for humidity, pressure, and flowrate control. OMRON also provides temperature and humidity sensors.

Introduction	Features
Principles	Classifications
Engineering Data	Further Information
Explanation of Terms	Troubleshooting

Related Contents

Primary Contents

Connection Examples between Temperature Controllers and SSRs
Thermocouple Standard Potential Difference
Reference Temperature Characteristics for Platinum Resistance Thermometers
Standard Temperature Characteristics for Element-interchangeable Thermistors
FAQs

[[Connection Examples between Temperature Controllers and SSRs]]

Calculating the Number of Connectable SSRs in Parallel
(A): The maximum load current for the voltage output (for driving SSR) of each Temperature Controller.
(B): SSR input current
(A) ÷ (B) = Number of connectable SSRs

*1. Two G3PE-BL SSRs can be connected.
*2. One G3PE-BL SSR can be connected.
*3. Two G3PA-BL SSRs can be connected.
*4. One G3PA-BL SSR can be connected.
*5. Two of the -UTU models of the G3NA SSRs can be connected.
*6. One of the -UTU model of the G3NA SSRs can be connected.
Four of the 480-VAC models of the G3NA SSRs can be connected.

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Thermocouple Standard Potential Difference

Thermocouples generate voltage according to the temperature difference. The potential difference is prescribed by Japanese Industrial Standards (JIS).
The following chart gives the potential difference for R, S, K, and J thermocouples when the temperature of the reference junction is 0°C.

(Standards Published in 2015)

JIS C 1602-2015 (Unit: μV)

Category	Temperature(°C)	0	10	20	30	40	50	60	70	80	90
R standard potential difference	0	0	54	111	171	232	296	363	431	501	573
	100	647	723	800	879	959	1,041	1,124	1,208	1,294	1,381
	200	1,469	1,558	1,648	1,739	1,831	1,923	2,017	2,112	2,207	2,304
	300	2,401	2,498	2,597	2,696	2,796	2,896	2,997	3,099	3,201	3,304
	400	3,408	3,512	3,616	3,721	3,827	3,933	4,040	4,147	4,255	4,363
	500	4,471	4,580	4,690	4,800	4,910	5,021	5,133	5,245	5,357	5,470
	600	5,583	5,697	5,812	5,926	6,041	6,157	6,273	6,390	6,507	6,625
	700	6,743	6,861	6,980	7,100	7,220	7,340	7,461	7,583	7,705	7,827
	800	7,950	8,073	8,197	8,321	8,446	8,571	8,697	8,823	8,950	9,077
	900	9,205	9,333	9,461	9,590	9,720	9,850	9,980	10,111	10,242	10,374
	1,000	10,506	10,638	10,771	10,905	11,039	11,173	11,307	11,442	11,578	11,714
	1,100	11,850	11,986	12,123	12,260	12,397	12,535	12,673	12,812	12,950	13,089
	1,200	13,228	13,367	13,507	13,646	13,786	13,926	14,066	14,207	14,347	14,488
	1,300	14,629	14,770	14,911	15,052	15,193	15,334	15,475	15,616	15,758	15,899
	1,400	16,040	16,181	16,323	16,464	16,605	16,746	16,887	17,028	17,169	17,310
	1,500	17,451	17,591	17,732	17,872	18,012	18,152	18,292	18,431	18,571	18,710
	1,600	18,849	18,988	19,126	19,264	19,402	19,540	19,677	19,814	19,951	20,087
	1,700	20,222	20,356	20,488	20,620	20,749	20,877	21,003	---	---	---
S standard potential difference	0	0	55	113	173	235	299	365	433	502	573
	100	646	720	795	872	950	1,029	1,110	1,191	1,273	1,357
	200	1,441	1,526	1,612	1,698	1,786	1,874	1,962	2,052	2,141	2,232
	300	2,323	2,415	2,507	2,599	2,692	2,786	2,880	2,974	3,069	3,164
	400	3,259	3,355	3,451	3,548	3,645	3,742	3,840	3,938	4,036	4,134
	500	4,233	4,332	4,432	4,532	4,632	4,732	4,833	4,934	5,035	5,137
	600	5,239	5,341	5,443	5,546	5,649	5,753	5,857	5,961	6,065	6,170
	700	6,275	6,381	6,486	6,593	6,699	6,806	6,913	7,020	7,128	7,236
	800	7,345	7,454	7,563	7,673	7,783	7,893	8,003	8,114	8,226	8,337
	900	8,449	8,562	8,674	8,787	8,900	9,014	9,128	9,242	9,357	9,472
	1,000	9,587	9,703	9,819	9,935	10,051	10,168	10,285	10,403	10,520	10,638
	1,100	10,757	10,875	10,994	11,113	11,232	11,351	11,471	11,590	11,710	11,830
	1,200	11,951	12,071	12,191	12,312	12,433	12,554	12,675	12,796	12,917	13,038
	1,300	13,159	13,280	13,402	13,523	13,644	13,766	13,887	14,009	14,130	14,251
	1,400	14,373	14,494	14,615	14,736	14,857	14,978	15,099	15,220	15,341	15,461
	1,500	15,582	15,702	15,822	15,942	16,062	16,182	16,301	16,420	16,539	16,658
	1,600	16,777	16,895	17,013	17,131	17,249	17,366	17,483	17,600	17,717	17,832
	1,700	17,947	18,061	18,174	18,285	18,395	18,503	18,609	---	---	---
K standard potential difference	0	0	397	798	1,203	1,612	2,023	2,436	2,851	3,267	3,682
	100	4,096	4,509	4,920	5,328	5,735	6,138	6,540	6,941	7,340	7,739
	200	8,138	8,539	8,940	9,343	9,747	10,153	10,561	10,971	11,382	11,795
	300	12,209	12,624	13,040	13,457	13,874	14,293	14,713	15,133	15,554	15,975
	400	16,397	16,820	17,243	17,667	18,091	18,516	18,941	19,366	19,792	20,218
	500	20,644	21,071	21,497	21,924	22,350	22,776	23,203	23,629	24,055	24,480
	600	24,905	25,330	25,755	26,179	26,602	27,025	27,447	27,869	28,289	28,710
	700	29,129	29,548	29,965	30,382	30,798	31,213	31,628	32,041	32,453	32,865
	800	33,275	33,685	34,093	34,501	34,908	35,313	35,718	36,121	36,524	36,925
	900	37,326	37,725	38,124	38,522	38,918	39,314	39,708	40,101	40,494	40,885
	1,000	41,276	41,665	42,053	42,440	42,826	43,211	43,595	43,978	44,359	44,740
	1,100	45,119	45,497	45,873	46,249	46,623	46,995	47,367	47,737	48,105	48,473
	1,200	48,838	49,202	49,565	49,926	50,286	50,644	51,000	51,355	51,708	52,060
	1,300	52,410	52,759	53,106	53,451	53,795	54,138	54,479	54,819	---	---
J standard potential difference	0	0	507	1,019	1,537	2,059	2,585	3,116	3,650	4,187	4,726
	100	5,269	5,814	6,360	6,909	7,459	8,010	8,562	9,115	9,669	10,224
	200	10,779	11,334	11,889	12,445	13,000	13,555	14,110	14,665	15,219	15,773
	300	16,327	16,881	17,434	17,986	18,538	19,090	19,642	20,194	20,745	21,297
	400	21,848	22,400	22,952	23,504	24,057	24,610	25,164	25,720	26,276	26,834
	500	27,393	27,953	28,516	29,080	29,647	30,216	30,788	31,362	31,939	32,519
	600	33,102	33,689	34,279	34,873	35,470	36,071	36,675	37,284	37,896	38,512
	700	39,132	39,755	40,382	41,012	41,645	42,281	42,919	43,559	44,203	44,848
	800	45,494	46,141	46,786	47,431	48,074	48,715	49,353	49,989	50,622	51,251
	900	51,877	52,500	53,119	53,735	54,347	54,956	55,561	56,164	56,763	57,360
	1,000	57,953	58,545	59,134	59,721	60,307	60,890	61,473	62,054	62,634	63,214
	1,100	63,792	64,370	64,948	65,525	66,102	66,679	67,255	67,831	68,406	68,980
	1,200	69,553	---	---	---	---	---	---	---	---	---

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Reference Temperature Characteristics for Platinum Resistance Thermometers (Ω)

Pt100

JIS C 1604-2013

Temperature (°C)	-100	-0	Temperature (°C)	0	100	200	300	400	500	600	700	800
0	60.26	100.00	0	100.00	138.51	175.86	212.05	247.09	280.98	313.71	345.28	375.70
-10	56.19	96.09	10	103.90	142.29	179.53	215.61	250.53	284.30	316.92	348.38	378.68
-20	52.11	92.16	20	107.79	146.07	183.19	219.15	253.96	287.62	320.12	351.46	381.65
-30	48.00	88.22	30	111.67	149.83	186.84	222.68	257.38	290.92	323.30	354.53	384.60
-40	43.88	84.27	40	115.54	153.58	190.47	226.21	260.78	294.21	326.48	357.59	387.55
-50	39.72	80.31	50	119.40	157.33	194.10	229.72	264.18	297.49	329.64	360.64	390.48
-60	35.54	76.33	60	123.24	161.05	197.71	233.21	267.56	300.75	332.79	363.67	---
-70	31.34	72.33	70	127.08	164.77	201.31	236.70	270.93	304.01	335.93	366.70	---
-80	27.10	68.33	80	130.90	168.48	204.90	240.18	274.29	307.25	339.06	369.71	---
-90	22.83	64.30	90	134.71	172.17	208.48	243.64	277.64	310.49	342.18	372.71	---
-100	18.52	60.26	100	138.51	175.86	212.05	247.09	280.98	313.71	345.28	375.70	---

JPt100

JIS C 1604-1997

Temperature (°C)	-100	-0	Temperature (°C)	0	100	200	300	400	500
0	59.57	100.00	0	100.00	139.16	177.13	213.93	249.56	284.02
-10	55.44	96.02	10	103.97	143.01	180.86	217.54	253.06	---
-20	51.29	92.02	20	107.93	146.85	184.58	221.15	256.55	---
-30	47.11	88.01	30	111.88	150.67	188.29	224.74	260.02	---
-40	42.91	83.99	40	115.81	154.49	191.99	228.32	263.49	---
-50	38.68	79.96	50	119.73	158.29	195.67	231.89	266.94	---
-60	34.42	75.91	60	123.64	162.08	199.35	235.45	270.38	---
-70	30.12	71.85	70	127.54	165.86	203.01	238.99	273.80	---
-80	25.80	67.77	80	131.42	169.63	206.66	242.53	277.22	---
-90	21.46	63.68	90	135.30	173.38	210.30	246.05	280.63	---
-100	17.14	59.57	100	139.16	177.13	213.93	249.56	284.02	---

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Standard Temperature Characteristics for Element-interchangeable Thermistors

The thermistor can be used with E5C2, E5L and E5CS. Refer to the applicable thermistor in each datasheet.

JIS C 1611-1995

Note: Amount of change in resistance per degree C in the resistance deviation and specified temperature.

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FAQs

The temperature error of the Temperature Controller seems large. What is the cause of this?

The following are possible causes.

The input type of the temperature sensor is incorrect (temperature sensor type setting).

Temperature sensor lead wires and power lines are in the same conduit, causing noise from the power lines (generally, display values will be unstable).
Countermeasures
Wire the lead wires and power lines in separate conduits, or wire them using a more direct path.

Connection between the Temperature Controller and thermocouple is using copper wires.
Countermeasures
Connect the thermocouple’s lead wires directly, or connect a compensating conductor that is suitable for the thermocouple.

The measurement location of the temperature sensor is not suitable.

The incorrect input shift value has been set.

Why does overshooting or undershooting occur?

The following are possible causes.

Narrow proportional band or small P constant

Short integral time or small I constant

Long derivative time or large D constant

ON/OFF control is enabled.

Control period is long for a control system with a fast thermal response.

Setting the overlap band in the heating and cooling control to a dead band by mistake.

Why are process values not being displayed correctly? And why is S.Err displayed?

The following are possible causes.

The input type in the Initial Setting Level is set incorrectly.

The temperature unit in the Initial Setting Level is set incorrectly.

The input shift value in the Adjustment Level is set incorrectly.

The data setting unit is incorrect.

The temperature sensor polarity or connected terminals are incorrect.

A temperature sensor has been connected that cannot be used with the installed Temperature Controller.

The temperature sensor has burnt out, shortcircuited, or deteriorated.

The temperature sensor has not been connected.

The thermocouple and compensating conductor types are incorrect.

A device using metal other than a thermocouple or compensating conductor has been connected between the thermocouple and Temperature Controller.

The connection terminal screws are loose and a contact failure occurs.

The thermocouple lead wires or compensating conductors are too long and the conductor resistance is affecting the Temperature Controller.

The resistance of the three conductors connected between the platinum resistance thermometer and the Temperature Controller terminals is different.

Noise emitted by devices around the Temperature Controller is affecting the Temperature Controller.

The temperature sensor lead wires and power lines are close, causing inductive noise from the power lines.

The thermal response is slow because the installation location of the temperature sensor is far from the control point.

The ambient operating temperature of the Temperature Controller exceeds the rating.

A wireless device is used around the Temperature Controller.

The temperature of the thermocouple-input-type terminal block varies due to heat radiated from peripheral devices.

Wind is blowing on the thermocouple-input-type terminal block.

Why does the process value exceeds the set point?

The following are possible causes.

The contacts for the relay driven by control outputs are welded.

The SSR has a short-circuit fault.

The PID constants are not suitable.

Restricted MV limit values are set.

The controlled object is heating by itself.

Why does the process value oscillate around the set point and not stabilize at the set point?

The following are possible causes.

Narrow proportional band or small P constant

Short integral time or small I constant

Long derivative time or large D constant

ON/OFF control is enabled.

Control period is long for a control system with a fast thermal response.

Setting the overlap band in the heating and cooling control to a dead band by mistake.

The heating capacity of the heater is too large for the heating capacity of the controlled object.

There is periodic external disturbance, which changes the heating capacity of the controlled object.

AT execution is in progress.

Why are communications not possible or why are there communications errors?

The following are possible causes.

The communications wiring is not correct.

The communications line has become disconnected.

The communications cable is broken.

The communications cable is too long.

The wrong communications cable has been used.

More than the specified number of communications devices are connected to the same communications path. (RS-422/RS-485 only)

Terminating resistance has not been connected at each end of the communications line. (RS-422/RS-485 only)

The specified power supply voltage is not being supplied to the Temperature Controller.

The specified power supply voltage is not being supplied to an Interface Converter (such as the K3SC).

The same baud rate and communications method are not being used by all of the Temperature Controllers, host devices, and other devices on the same communications line.

The unit number specified in the command frame is different from the unit number set by the Temperature Controller.

The same unit number as the Temperature Controller is being used for another node on the same communications line. (RS-422/RS-485 only)

There is a mistake in programming the host device.

The host device detects an error before it receives a response from the Temperature Controller.

The host device detects the absence of a response as an error after a broadcast command or a software reset command (except for SYSWAY).

The host device sent another command before receiving a response from the Temperature Controller.

The host device sent the next command too soon after receiving a response from the Temperature Controller.

The communications line became unstable when the Temperature Controller power was turned ON or interrupted, and the host device read the unstable status as data.

The communications data was corrupted by noise from the environment.

What precautions should be taken when extending the temperature sensor lead wires?

Platinum Resistance Thermometer: Pt and JPt
Make sure the three lead wires to be used for extension have the same resistance and are the same length.
Extending the lead wires will cause their resistance to influence the displayed temperature. Therefore, use wire with a thick conductor. (Extension lead wires are not available from OMRON. Use commercially available lead wires.)

Thermocouple: K, J, and R
Always use compensating lead wires for extension.
Use a compensating conductor designed for the connected thermocouple.
If you use a different type of compensating conductor from the thermocouple or if you use normal copper wires to extend, correct temperature measurement will not be possible.
Also, do not connect positive and negative incorrectly.

Thermistor
Use wire with a thick conductor for the lead-wire extensions. There is no polarity.

Common Precautions
The lead wires will be easily influenced by noise when they are extended. Be careful when performing wiring.

How much of an insertion length does the temperature sensor require?

Make sure the protective tube has sufficient length to touch the object to be measured, or to insert it into the object.
A length of at least 20 times the diameter of the protective tube is required for metal protective tubes. A length of at least 15 times the diameter of the protective tube is required for non-metal protective tubes.

Can the temperature sensor be used when it is bent?

Sheathed temperature sensors can be bent. The following precautions, however, should be taken.

The minimum permissible bend radius of a sheathed temperature sensor is five times the diameter of the protective tube. Do not bend the temperature sensor repeatedly in the same place.

Internal wiring may become disconnected or warped if the temperature sensor is bent to an acute angle and then stretched out again. Also, do not bend the welded section.

The protective tube is brittle when low temperatures are being measured. Do not bend the tube when it is cold.

To protect the measuring part of the sheathed temperature sensor, do not bend the sensor within 100 mm of the tip.

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