Liquid Level Control Control Valves Pressure Control Temperature Control Glycol Pump

Temperature Controllers

Indirect Thermostat T12 Negative feedback for linear output 5 to 30 psi air or gas supply pressure Stainless steel housing Bi-metal sensing element for accurate control Single adjustment over Wide temperature range: T 12 -30 to 400oF HT 12 -30 to 700oF Output pressure proportionate to temperature at any setting T12

? Direct or Indirect ? Direct Mode Indirect Mode Rising Temperature Rising Temperature Rising Output Falling Output Direct Indirect

Indirect Thermostat Indirect

Thermostat with Separable Socket Maximum Working Pressure Without Separable Socket 500 psi With Separable Socket 4000 psi With Special Separable Socket 7000 psi

Direct Acting Thermostat Supply Output T 12DA Direct

T 12DA Thermostat Reversed for Indirect Throttle Mode Supply Output

High Temperature Thermostat Supply Output HT 12 Indirect

Direct Snap Thermostat Output Supply Direct

Indirect Snap Thermostat T 12DAS Output Supply Indirect

Indirect Throttle Thermostat Output Supply Indirect

Direct Throttle Thermostat Output Supply T 12TDA Direct

Direct Semi-Throttle Thermostat T 12DAT Output Supply Direct

Indirect High Temperature Shut-Down T 12M Output Supply Indirect

Direct Low Temperature Shut-Down T 12DAM Output Supply Direct

High Temperature Pilot Guard Supply HT 12PG Output Direct

Typical Installation High temperature shutdown thermostat Burner control thermostat Burner valve Main burner Safety shutdown valve Pilot Pilot Guard thermostat Instrument Gas

Typical Burner Control Installation Low liquid shutdown pilot High temperature shutdown thermostat Burner control thermostat Main burner Pilot Instrument Gas Pilot Guard thermostat Safety shutdown valve Burner valve

Trouble Shooting SYMPTOM CAUSE Bent sensing element Erratic temperature changes Continuous venting Bent sensing element (element should be centered in base and should “ring”) Incomplete immersion of probe Dirty pilot plug seat Hole in diaphragm Weak pilot plug spring Faulty ‘O’ ring

Trouble Shooting To check small seat: increase temperature setting several degrees and see if venting stops. To check large seat: decrease temperature setting Replace pilot plug and seats if unable to stop venting by cleaning seats.