Siemens HTRI-D (500-033360) — addressable dual-input intelligent interface module that supervises and monitors two sets of dry contacts while occupying only one address on the loop.
The HTRI-D interfaces normally open or normally closed dry contacts to a Siemens addressable fire alarm control panel and reports their status back to the panel. It takes a single address but responds independently to each input, and its LED flashes twice — once for each address — which makes it the natural choice for monitoring a water-flow switch together with its associated valve tamper switch on one device. Each module contains a microcomputer chip that stores identification information and operating-status data, and it is dynamically supervised by the panel. Wiring is two-wire and polarity insensitive via SureWire technology, with screw terminals and the programming port reachable from the front without removing the module. A multi-color LED shows green in normal operation, amber in trouble, and red on a change of state. The module ships with a 5-inch square plastic faceplate.
Specifications
| Part number |
500-033360 |
| Type |
Addressable dual-input intelligent interface module; one address, two independently reported inputs |
| Inputs |
Two sets of normally open (N.O.) or normally closed (N.C.) dry contacts |
| Current draw (active or standby) |
1.3 mA |
| Operating temperature |
32°F to 120°F (0°C to 49°C) |
| Relative humidity |
Not greater than 93%, non-condensing |
| Wiring |
Two-wire, polarity insensitive (SureWire); screw terminals |
| Mounting |
4-inch (10.2 cm) square, 2-1/4 in. (5.7 cm) deep back box, or a user-supplied double-gang back box |
| Faceplate |
5 in. x 5 in. (12.7 cm x 12.7 cm) off-white plastic faceplate included |
| Status LED |
Multi-color: green normal, amber trouble, red change of state; flashes twice, once per address |
| Addressing |
Electronic, set into non-volatile memory by the Model DPU; no jumpers, DIP switches or rotary dials |
| Listings and approvals |
UL Listed and ULC Listed; FM, CSFM and NYCFD Approved |
Installation notes
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One address, two inputs: the HTRI-D reports each input independently, so a flow switch and its tamper switch can share a device without losing separate annunciation. That is the usual reason to specify the -D over two HTRI-S modules.
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No relay on this module: if the application needs to control or shunt external equipment, the HTRI-R with its Form C relay is the correct part — the HTRI-D monitors only.
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Address before installation: the DPU (500-033260) sets and verifies the address and tests the module. Because the address lives in non-volatile memory rather than in mechanical switches, vibration and corrosion cannot shift it.
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Box depth matters: the module needs a 4-inch square box 2-1/4 in. deep, or a double-gang box. A shallow ring is the common site problem.
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Marine installations: the plastic faceplate must be replaced with the metal USCG-HPLATE cover (S54319-F22-A1), which is what protects the module from radio-frequency interference. It is ordered separately.
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Mixed loops: fully compatible on the same Siemens FACP loop as H-series intelligent detectors, HMS-series addressable manual stations, and other addressable modules such as HZM and HCP.
Related models
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HTRI-S (500-033370) — single-input module; monitors and reports one contact, no relay
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HTRI-R (500-033300) — single-input module with an integral SPDT Form C relay rated 4 A resistive at 125 VAC / 30 VDC, for control or shunting
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HTRI-DZ (S54322-F10-A1) — the same dual-input module under the S-series part number
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XTRI-D (S54370-B2-A1) — the later X-series dual-input module, which adds built-in ISOtechnology dual isolation for NFPA 72 Class X wiring
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USCG-HPLATE (S54319-F22-A1) — metal cover plate required for Marine installations
Specifications taken from the Siemens data sheet "HTRI Series Interface Modules, Models HTRI-D/-DZ, HTRI-R/-RZ and HTRI-S/-SZ (and USCG-HPLATE for Marine installs)," document 6304 (July 2018, Rev. 7). Manufacturer specifications are subject to change without notice.
