Environmental service operations and commands

Scope: glycol, air, ambient/enclosure temperature monitoring, vacuum, and cryogenic control.

Glycol

The exposed ZFront manifold distributes cooling to ZImager, ZSpec, and the ZFront EBox. It includes temperature, flow, leak monitoring, and automatic shutoff. Leak monitoring must remain available with modules disconnected.

Function	Inputs	Status and feedback	Details still needed
Monitor cooling	Circuit	Supply/return temperature, flow, leak state	Sensor locations and branch coverage
Shut off cooling on a leak	Local leak indication	Shutoff and leak state	Which branch or supply closes; reset behavior
Enable/isolate a branch, if remotely controlled	Branch and requested state	Valve state	Valve selection and remote interface

Connections: glycol harness.

Air

Air supplies enclosure positive pressure and any pneumatic actuators selected for ZFront. The manifold includes pressure sensing. Valve controls and behavior on loss of air depend on the actuator choices.

Function	Status and feedback	Details still needed
Monitor supply	Pressure and sensor status	Sensor location, units, operating range

Connections: air harness. Mechanism commands are in ZFront/ZCal.

Ambient and enclosure temperatures

ZImager and VIS use 1-Wire hubs and temperature sensors. NIR may use the cryogenic temperature controller for enclosure monitoring as well.

Reading	Associated information
Temperature	Sensor name/location, value, units, sample time, missing/fault indication

Sensor locations and any use in focus maintenance will be added with the thermal and optical design.

Vacuum

Each B/G/R detector vessel and the NIR cryostat has a gauge and automatic gate valve, with a shared pump. Gate-valve operation is independent of host software.

Function	Status or control	Details still needed
Read vacuum	Vessel pressure, units, gauge status	Gauge/controller interface
Observe automatic isolation	Valve position and local fault, where available	Local logic and status connections
Pump down or isolate a vessel	Local controls; remote controls if fitted	Valve arrangement and operating procedure

Connections: vacuum harness.

Cryogenic and thermal control

Assembly	Controls and readings	Details still needed
VIS B/G/R detector assemblies	Individual cryocooler controls, temperatures, faults	Interfaces, operating temperatures, and cooling dependencies
NIR cryostat	Temperature-controller setpoints, sensors/heaters, coldhead and compressor status	Sensor/heater assignments, temperature limits, cooldown/warm-up behavior
Mechanical room	Compressor and cryo-monitor status	Available controls and fault indications

Connections: ZSpec VIS, ZSpec NIR, and glycol.

Team notes: Selected hardware will determine the temperature/pressure limits and the response to cooling, vacuum, or power loss. Local protection, retained monitoring, and recovery need to work with modules absent or on the bench. These are still design tasks; numerical limits and operating sequences are not yet assigned.