The Moniteur TTL sensing system is an advanced and reliable method of position monitoring developed for today’s sophisticated process control systems. The highest quality reed-type switching elements available are enclosed and encapsulated in a flexible moisture-proof bedding compound, protecting them from contaminants and shock to 38g. Switching elements are actuated with neodymium magnets sealed in their cams to protect and prevent dislodgement and subsequent system failure. An internal stainless steel Loc-Ring is employed to secure the VPT shaft to the enclosure, preventing vertical shaft motion from corrupting output signals. Four different switching elements are available, each meeting different user needs.
TTL Switching Elements Available
TUNGSTEN TTL – The choice for AC switching applications – use . Durable tungsten contacts handle up to 3A – 120VAC / 2A – 24VDC and 100 watts of power. TUNGSTEN TTL HV switches can handle 100 W at voltages up to 500 VAC or VDC. MTBF for both is 800,000 cycles at full load.
RHODIUM TTL – The choice for DC switching applications. With 80% less contact resistance than Tungsten, these switches are best suited to modern control systems using low power DC feedback signals. Rated to 1A – 24VDC. MTBF 1,000,000 cycles at full load, much higher at low loads.
KRYSTAL TTL – Rhodium TTL contacts combined with LED set lights make switch setting easier in the field. MTBF 1,000,000 cycles
Specifications
| Specifications | |||||
|---|---|---|---|---|---|
| Switch Type | Code | AC Rating | DC Rating | Contacts | Form |
| Tungsten TTL | 2 | 3.0A-120V | 2.0A-24V | SPDT | C |
| Tungsten TTL HV | E | 0.4A – 250VAC | 0.4A – 250VDC | SPDT | C |
| Rhodium TTL | T | 0.25A-120V | 1.0A-24V | SPDT | C |
| Krystal TTL* | L | 0.3A-120V | 0.2A-24V | SPDT | C |
*Krystal TTL includes pure Rhodium contacts and LED set lights
Applications for TTL Switches
Areas with corrosive or humid environments that could corrode exposed contacts
Critical position monitoring applications requiring reliability and higher cycle life
Explosion-proof environments. Explosion-proof environments. Moniteur Sentinel series is UL listed and CSA** approved for Class I, Division 2 – Groups A, B, Class 1, Division 1 Groups C, D and Class II, Division 1, Groups E, F, G.
Nonincendive (Class 1, Division 2) environments. Class 1, Division 2 environments requiring hermetically sealed contacts or nonincendive circuits. Article 501-3 (b) of the NEC (National Electric Code) permits the use of general purpose enclosures (such as the Moniteur Watchman or Survivor Series) in Class 1, Division 2 locations when the current interrupting contacts are sealed within a hermetically sealed chamber.
Intrinsically safe environments. TTL switches are passive devices and can be used in Intrinsically Safe applications with an approved current and voltage-limiting barrier.